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  • Journal article
    Zhao L-L, Zank GP, He JS, Telloni D, Hu Q, Li G, Nakanotani M, Adhikari L, Kilpua EKJ, Horbury TS, O'Brien H, Evans V, Angelini Vet al., 2021,

    Turbulence and wave transmission at an ICME-driven shock observed by the Solar Orbiter and Wind

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Davies EE, Mostl C, Owens MJ, Weiss AJ, Amerstorfer T, Hinterreiter J, Bauer M, Bailey RL, Reiss MA, Forsyth RJ, Horbury TS, O'Brien H, Evans V, Angelini V, Heyner D, Richter I, Auster H-U, Magnes W, Baumjohann W, Fischer D, Barnes D, Davies JA, Harrison RAet al., 2021,

    In situ multi-spacecraft and remote imaging observations of the first CME detected by Solar Orbiter and BepiColombo

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 22
  • Journal article
    Verscharen D, Stansby D, Finley AJ, Owen CJ, Horbury T, Maksimovic M, Velli M, Bale SD, Louarn P, Fedorov A, Bruno R, Livi S, Khotyaintsev Y, Vecchio A, Lewis GR, Anekallu C, Kelly CW, Watson G, Kataria DO, O'Brien H, Evans V, Angelini Vet al., 2021,

    The angular-momentum flux in the solar wind observed during Solar Orbiter's first orbit

    , Astronomy and Astrophysics: a European journal, Vol: 656, Pages: 1-10, ISSN: 0004-6361

    Aims. We present the first measurements of the angular-momentum flux in the solar wind recorded by the Solar Orbiter spacecraft. Our aim is to validate these measurements to support future studies of the Sun’s angular-momentum loss.Methods. We combined 60-min averages of the proton bulk moments and the magnetic field measured by the Solar Wind Analyser and the magnetometer onboard Solar Orbiter. We calculated the angular-momentum flux per solid-angle element using data from the first orbit of the mission’s cruise phase in 2020. We separated the contributions from protons and from magnetic stresses to the total angular-momentum flux.Results. The angular-momentum flux varies significantly over time. The particle contribution typically dominates over the magnetic-field contribution during our measurement interval. The total angular-momentum flux shows the largest variation and is typically anti-correlated with the radial solar-wind speed. We identify a compression region, potentially associated with a co-rotating interaction region or a coronal mass ejection, which leads to a significant localised increase in the angular-momentum flux, albeit without a significant increase in the angular momentum per unit mass. We repeated our analysis using the density estimate from the Radio and Plasma Waves instrument. Using this independent method, we find a decrease in the peaks of positive angular-momentum flux, but otherwise, our results remain consistent.Conclusions. Our results largely agree with previous measurements of the solar wind’s angular-momentum flux in terms of amplitude, variability, and dependence on radial solar-wind bulk speed. Our analysis highlights the potential for more detailed future studies of the solar wind’s angular momentum and its other large-scale properties with data from Solar Orbiter. We emphasise the need for studying the radial evolution and latitudinal dependence of the angular-momentum flux in combination with data from
  • Journal article
    Carbone F, Sorriso-Valvo L, Khotyaintsev Y, Steinvall K, Vecchio A, Telloni D, Yordanova E, Graham DB, Edberg NJT, Eriksson A, Johansson EPG, Vasconez CL, Maksimovic M, Bruno R, D'Amicis R, Bale SD, Chust T, Krasnoselskikh V, Kretzschmar M, Lorfevre E, Plettemeier D, Soucek J, Steller M, Stverak S, Travnicek P, Vaivads A, Horbury TS, O'Brien H, Angelini V, Evans Vet al., 2021,

    Statistical study of electron density turbulence and ion-cyclotron waves in the inner heliosphere: Solar Orbiter observations

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Pisa D, Santolik O, Hanzelka M, Nicolaou G, Maksimovic M, Bale SD, Chust T, Khotyaintsev Y, Krasnoselskikh V, Kretzschmar M, Lorfevre E, Plettemeier D, Steller M, Stverak S, Travnicek P, Vaivads A, Vecchio A, Horbury T, O'Brien H, Evans V, Angelini V, Owen CJ, Louarn Pet al., 2021,

    First-year ion-acoustic wave observations in the solar wind by the RPW/TDS instrument on board Solar Orbiter

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Steinvall K, Khotyaintsev Y, Cozzani G, Vaivads A, Yordanova E, Eriksson A, Edberg NJT, Maksimovic M, Bale SD, Chust T, Krasnoselskikh V, Kretzschmar M, Lorfevre E, Plettemeier D, Soucek J, Steller M, Stverak S, Vecchio A, Horbury TS, O'Brien H, Evans V, Fedorov A, Louarn P, Genot V, Andre N, Lavraud B, Rouillard AP, Owen CJet al., 2021,

    Solar wind current sheets and deHoffmann-Teller analysis First results from Solar Orbiter's DC electric field measurements

    , Astronomy and Astrophysics: a European journal, Vol: 656, Pages: 1-7, ISSN: 0004-6361

    Context. Solar Orbiter was launched on 10 February 2020 with the purpose of investigating solar and heliospheric physics using a payload of instruments designed for both remote and in situ studies. Similar to the recently launched Parker Solar Probe, and unlike earlier missions, Solar Orbiter carries instruments designed to measure low-frequency DC electric fields.Aims. In this paper, we assess the quality of the low-frequency DC electric field measured by the Radio and Plasma Waves instrument (RPW) on Solar Orbiter. In particular, we investigate the possibility of using Solar Orbiter’s DC electric and magnetic field data to estimate the solar wind speed.Methods. We used a deHoffmann-Teller (HT) analysis, based on measurements of the electric and magnetic fields, to find the velocity of solar wind current sheets, which minimises a single component of the electric field. By comparing the HT velocity to the proton velocity measured by the Proton and Alpha particle Sensor (PAS), we have developed a simple model for the effective antenna length, Leff of the E-field probes. We then used the HT method to estimate the speed of the solar wind.Results. Using the HT method, we find that the observed variations in Ey are often in excellent agreement with the variations in the magnetic field. The magnitude of Ey, however, is uncertain due to the fact that the Leff depends on the plasma environment. Here, we derive an empirical model relating Leff to the Debye length, which we can use to improve the estimate of Ey and, consequently, the estimated solar wind speed.Conclusions. The low-frequency electric field provided by RPW is of high quality. Using the deHoffmann-Teller analysis, Solar Orbiter’s magnetic and electric field measurements can be used to estimate the solar wind speed when plasma data are unavailable.
  • Journal article
    Graham DB, Khotyaintsev Y, Vaivads A, Edberg NJT, Eriksson A, Johansson EPG, Sorriso-Valvo L, Maksimovic M, Soucek J, Pisa D, Bale SD, Chust T, Kretzschmar M, Krasnoselskikh V, Lorfevre E, Plettemeier D, Steller M, Stverak S, Travnicek P, Vecchio A, Horbury TS, O'Brien H, Evans V, Angelini Vet al., 2021,

    Kinetic electrostatic waves and their association with current structures in the solar wind

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Khotyaintsev Y, Graham DB, Vaivads A, Steinvall K, Edberg NJT, Eriksson A, Johansson EPG, Sorriso-Valvo L, Maksimovic M, Bale SD, Chust T, Krasnoselskikh V, Kretzschmar M, Lorfevre E, Plettemeier D, Soucek J, Steller M, Stverak S, Travnicek P, Vecchio A, Horbury TS, O'Brien H, Evans V, Angelini V, Lorfevre Eet al., 2021,

    Density fluctuations associated with turbulence and waves First observations by Solar Orbiter

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
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    • Citations: 15
  • Journal article
    Weiss AJ, Moestl C, Davies EE, Amerstorfer T, Bauer M, Hinterreiter J, Reiss MA, Bailey RL, Horbury TS, O'Brien H, Evans V, Angelini V, Heyner D, Richter I, Auster H-U, Magnes W, Fischer D, Baumjohann Wet al., 2021,

    Multi-point analysis of coronal mass ejection flux ropes using combined data from Solar Orbiter, BepiColombo, and Wind

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Kretzschmar M, Chust T, Krasnoselskikh V, Graham D, Colomban L, Maksimovic M, Khotyaintsev Y, Soucek J, Steinvall K, Santolik O, Jannet G, Brochot J-Y, Le Contel O, Vecchio A, Bonnin X, Bale SD, Froment C, Larosa A, Bergerard-Timofeeva M, Fergeau P, Lorfevre E, Plettemeier D, Steller M, Stverak S, Travnicek P, Vaivads A, Horbury TS, O'Brien H, Evans V, Angelini V, Owen CJ, Louarn Pet al., 2021,

    Whistler waves observed by Solar Orbiter/RPW between 0.5 AU and 1 AU

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 11
  • Journal article
    Eastwood JP, Stawarz JE, Phan TD, Laker R, Robertson S, Zhao L-L, Zank GP, Lavraud B, Shay MA, Evans V, Angelini V, O'Brien H, Horbury TSet al., 2021,

    Solar Orbiter observations of an ion-scale flux rope confined to a bifurcated solar wind current sheet

    , Astronomy & Astrophysics, Vol: 656, Pages: 1-8, ISSN: 0004-6361

    Context. Flux ropes in the solar wind are a key element of heliospheric dynamics and particle acceleration. When associated withcurrent sheets, the primary formation mechanism is magnetic reconnection and flux ropes in current sheets are commonly used astracers of the reconnection process.Aims. Whilst flux ropes associated with reconnecting current sheets in the solar wind have been reported, their occurrence, sizedistribution, and lifetime are not well understood.Methods. Here we present and analyse new Solar Orbiter magnetic field data reporting novel observations of a flux rope confined toa bifurcated current sheet in the solar wind. Comparative data and large-scale context is provided by Wind.Results. The Solar Orbiter observations reveal that the flux rope, which does not span the current sheet, is of ion scale, and in areconnection formation scenario, existed for a prolonged period of time as it was carried out in the reconnection exhaust. Wind is alsofound to have observed clear signatures of reconnection at what may be the same current sheet, thus demonstrating that reconnectionsignatures can be found separated by as much as ∼ 2 000 Earth radii, or 0.08 au.Conclusions. The Solar Orbiter observations provide new insight into the hierarchy of scales on which flux ropes can form, and showthat they exist down to the ion scale in the solar wind. The context provided by Wind extends the spatial scale over which reconnectionsignatures have been found at solar wind current sheets. The data suggest the local orientations of the current sheet at Solar Orbiterand Wind are rotated relative to each other, unlike reconnection observed at smaller separations; the implications of this are discussedwith reference to patchy vs. continuous reconnection scenarios.
  • Journal article
    Lavraud B, Kieokaew R, Fargette N, Louarn P, Fedorov A, André N, Fruit G, Génot V, Réville V, Rouillard AP, Plotnikov I, Penou E, Barthe A, Prech L, Owen CJ, Bruno R, Allegrini F, Berthomier M, Kataria D, Livi S, Raines JM, D'Amicis R, Eastwood JP, Froment C, Laker R, Maksimovic M, Marcucci F, Perri S, Perrone D, Phan TD, Stansby D, Stawarz J, Redondo ST, Vaivads A, Verscharen D, Zouganelis I, Angelini V, Evans V, Horbury TS, O'brien Het al., 2021,

    Magnetic reconnection as a mechanism to produce multiple protonpopulations and beams locally in the solar wind

    , Journal of Astrophysics and Astronomy, Vol: 656, Pages: 1-8, ISSN: 0250-6335

    Context. Spacecraft observations early revealed frequent multiple protonpopulations in the solar wind. Decades of research on their origin have focusedon processes such as magnetic reconnection in the low corona and wave-particleinteractions in the corona and locally in the solar wind.Aims.This study aimsto highlight that multiple proton populations and beams are also produced bymagnetic reconnection occurring locally in the solar wind. Methods. We use highresolution Solar Orbiter proton velocity distribution function measurements,complemented by electron and magnetic field data, to analyze the association ofmultiple proton populations and beams with magnetic reconnection during aperiod of slow Alfv\'enic solar wind on 16 July 2020. Results. At least 6reconnecting current sheets with associated multiple proton populations andbeams, including a case of magnetic reconnection at a switchback boundary, arefound during this day. This represents 2% of the measured distributionfunctions. We discuss how this proportion may be underestimated, and how it maydepend on solar wind type and distance from the Sun. Conclusions. Althoughsuggesting a likely small contribution, but which remains to be quantitativelyassessed, Solar Orbiter observations show that magnetic reconnection must beconsidered as one of the mechanisms that produce multiple proton populationsand beams locally in the solar wind.
  • Journal article
    Wimmer-Schweingruber RF, Janitzek NP, Pacheco D, Cernuda I, Lara FE, Gomez-Herrero R, Mason GM, Allen RC, Xu ZG, Carcaboso F, Kollhoff A, Kuehl P, von Forstner JLF, Berger L, Rodriguez-Pacheco J, Ho GC, Andrews GB, Angelini V, Aran A, Boden S, Bottcher S, Carrasco A, Dresing N, Eldrum S, Elftmann R, Evans V, Gevin O, Hayes J, Heber B, Horbury TS, Kulkarni SR, Lario D, Lees WJ, Limousin O, Malandraki OE, Martin C, O'Brien H, Mateo MP, Ravanbakhsh A, Rodriguez-Polo O, Sanchez Prieto S, Schlemm CE, Seifert H, Terasa JC, Tyagi K, Vainio R, Walsh A, Yedla MKet al., 2021,

    First year of energetic particle measurements in the inner heliosphere with Solar Orbiter's Energetic Particle Detector

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Cohen CMS, Christian ER, Cummings AC, Davis AJ, Desai M, de Nolfo GA, Giacalone J, Hill ME, Joyce CJ, Labrador AW, Leske RA, Matthaeus WH, McComas DJ, McNutt RL, Mewaldt RA, Mitchell DG, Mitchell JG, Rankin JS, Roelof EC, Schwadron NA, Stone EC, Szalay JR, Wiedenbeck ME, Vourlidas A, Bale SD, Pulupa M, MacDowall RJet al., 2021,

    PSP/IS⊙IS observations of the 29 November 2020 solar energetic particle event

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 22
  • Journal article
    Zaslavsky A, Mann I, Soucek J, Czechowski A, Pisa D, Vaverka J, Meyer-Vernet N, Maksimovic M, Lorfevre E, Issautier K, Babic KR, Bale SD, Morooka M, Vecchio A, Chust T, Khotyaintsev Y, Krasnoselskikh V, Kretzschmar M, Plettemeier D, Steller M, Stverak S, Travnicek P, Vaivads Aet al., 2021,

    First dust measurements with the Solar Orbiter Radio and Plasma Wave instrument

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 28
  • Journal article
    Owen CJ, Kataria DO, Bercic L, Horbury TS, Berthomier M, Verscharen D, Bruno R, Livi S, Louarn P, Anekallu C, Kelly CW, Lewis GR, Watson G, Fortunato V, Mele G, Nicolaou G, Wicks RT, O'Brien H, Evans V, Angelini Vet al., 2021,

    High-cadence measurements of electron pitch-angle distributions from Solar Orbiter SWA-EAS burst mode operations

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Kilpua EKJ, Good SW, Dresing N, Vainio R, Davies EE, Forsyth RJ, Gieseler J, Lavraud B, Asvestari E, Morosan DE, Pomoell J, Price DJ, Heyner D, Horbury TS, Angelini V, O'Brien H, Evans V, Rodriguez-Pacheco J, Herrero RG, Ho GC, Wimmer-Schweingruber Ret al., 2021,

    Multi-spacecraft observations of the structure of the sheath of an interplanetary coronal mass ejection and related energetic ion enhancement

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 11
  • Journal article
    Maksimovic M, Soucek J, Chust T, Khotyaintsev Y, Kretzschmar M, Bonnin X, Vecchio A, Alexandrova O, Bale SD, Berard D, Brochot J-Y, Edberg NJT, Eriksson A, Hadid LZ, Johansson EPG, Karlsson T, Katra B, Krasnoselskikh V, Krupar V, Lion S, Lorfevre E, Matteini L, Nguyen QN, Pisa D, Piberne R, Plettemeier D, Rucker HO, Santolik O, Steinvall K, Steller M, Stverak S, Travnicek P, Vaivads A, Zaslavsky A, Chaintreuil S, Dekkali M, Astier P-A, Barbary G, Boughedada K, Cecconi B, Chapron F, Collin C, Dias D, Gueguen L, Lamy L, Leray V, Malac-Allain LR, Pantellini F, Parisot J, Plasson P, Thijs S, Fratter I, Bellouard E, Danto P, Julien S, Guilhem E, Fiachetti C, Sanisidro J, Laffaye C, Gonzalez F, Pontet B, Queruel N, Jannet G, Fergeau P, de Wit TD, Vincent T, Agrapart C, Pragout J, Bergerard-Timofeeva M, Delory GT, Turin P, Jeandet A, Leroy P, Pellion J-C, Bouzid V, Recart W, Kolmasova I, Kruparova O, Uhlir L, Lan R, Base J, Andre M, Bylander L, Cripps V, Cully C, Jansson S-E, Puccio W, Brinek J, Ottacher H, Angelini V, Berthomier M, Evans V, Goetz K, Hellinger P, Horbury TS, Issautier K, Kontar E, Le Contel O, Louarn P, Martinovic M, Mueller D, O'Brien H, Owen CJ, Retino A, Rodriguez-Pacheco J, Sahraoui F, Sanchez L, Walsh AP, Wimmer-Schweingruber RF, Zouganelis Iet al., 2021,

    First observations and performance of the RPW instrument on board the Solar Orbiter mission

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Telloni D, Scolini C, Moestl C, Zank GP, Zhao L-L, Weiss AJ, Reiss MA, Laker R, Perrone D, Khotyaintsev Y, Steinvall K, Sorriso-Valvo L, Horbury TS, Wimmer-Schweingruber RF, Bruno R, D'Amicis R, De Marco R, Jagarlamudi VK, Carbone F, Marino R, Stangalini M, Nakanotani M, Adhikari L, Liang H, Woodham LD, Davies EE, Hietala H, Perri S, Gomez-Herrero R, Rodriguez-Pacheco J, Antonucci E, Romoli M, Fineschi S, Maksimovic M, Soucek J, Chust T, Kretzschmar M, Vecchio A, Muller D, Zouganelis I, Winslow RM, Giordano S, Mancuso S, Susino R, Ivanovski SL, Messerotti M, O'Brien H, Evans V, Angelini Vet al., 2021,

    Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage Observations and modeling

    , Astronomy and Astrophysics: a European journal, Vol: 656, ISSN: 0004-6361

    Context. Solar Orbiter, the new-generation mission dedicated to solar and heliospheric exploration, was successfully launched on February 10, 2020, 04:03 UTC from Cape Canaveral. During its first perihelion passage in June 2020, two successive interplanetary coronal mass ejections (ICMEs), propagating along the heliospheric current sheet (HCS), impacted the spacecraft.Aims. This paper addresses the investigation of the ICMEs encountered by Solar Orbiter on June 7−8, 2020, from both an observational and a modeling perspective. The aim is to provide a full description of those events, their mutual interaction, and their coupling with the ambient solar wind and the HCS.Methods. Data acquired by the MAG magnetometer, the Energetic Particle Detector suite, and the Radio and Plasma Waves instrument are used to provide information on the ICMEs’ magnetic topology configuration, their magnetic connectivity to the Sun, and insights into the heliospheric plasma environment where they travel, respectively. On the modeling side, the Heliospheric Upwind eXtrapolation model, the 3D COronal Rope Ejection technique, and the EUropean Heliospheric FORecasting Information Asset (EUHFORIA) tool are used to complement Solar Orbiter observations of the ambient solar wind and ICMEs, and to simulate the evolution and interaction of the ejecta in the inner heliosphere, respectively.Results. Both data analysis and numerical simulations indicate that the passage of two distinct, dynamically and magnetically interacting (via magnetic reconnection processes) ICMEs at Solar Orbiter is a possible scenario, supported by the numerous similarities between EUHFORIA time series at Solar Orbiter and Solar Orbiter data.Conclusions. The combination of in situ measurements and numerical simulations (together with remote sensing observations of the corona and inner heliosphere) will significantly lead to a deeper understanding of the physical processes occurring during the CME-CME interaction.
  • Journal article
    Hadid LZ, Edberg NJT, Chust T, Pisa D, Dimmock AP, Morooka MW, Maksimovic M, Khotyaintsev Y, Soucek J, Kretzschmar M, Vecchio A, Le Contel O, Retino A, Allen RC, Volwerk M, Fowler CM, Sorriso-Valvo L, Karlsson T, Santolik O, Kolmasova I, Sahraoui F, Stergiopoulou K, Moussas X, Issautier K, Dewey RM, Wolt MK, Malandraki OE, Kontar EP, Howes GG, Bale SD, Horbury TS, Martinovic M, Vaivads A, Krasnoselskikh V, Lorfevre E, Plettemeier D, Steller M, Stverak S, Travnicek P, O'Brien H, Evans V, Angelini V, Velli MC, Zouganelis Iet al., 2021,

    Solar Orbiter's first Venus flyby: Observations from the Radio and Plasma Wave instrument

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 13
  • Journal article
    Kollhoff A, Kouloumvakos A, Lario D, Dresing N, Gomez-Herrero R, Rodriguez-Garcia L, Malandraki OE, Richardson IG, Posner A, Klein K-L, Pacheco D, Klassen A, Heber B, Cohen CMS, Laitinen T, Cernuda I, Dalla S, Lara FE, Vainio R, Koeberle M, Kuehl R, Xu ZG, Berger L, Eldrum S, Bruedern M, Laurenza M, Kilpua EJ, Aran A, Rouillard AP, Bucik R, Wijsen N, Pomoell J, Wimmer-Schweingruber RF, Martin C, Boettcher S, von Forstner JLF, Terasa J-C, Boden S, Kulkarni SR, Ravanbakhsh A, Yedla M, Janitzek N, Rodriguez-Pacheco J, Mateo MP, Prieto SS, Espada PP, Polo OR, Hellin AM, Carcaboso F, Mason GM, Ho GC, Allen RC, Andrews GB, Schlemm CE, Seifert H, Tyagi K, Lees WJ, Hayes J, Bale SD, Krupar V, Horbury TS, Angelini V, Evans V, O'Brien H, Maksimovic M, Khotyaintsev Y, Vecchio A, Steinvall K, Asvestari Eet al., 2021,

    The first widespread solar energetic particle event observed by Solar Orbiter on 2020 November 29

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
    • Cite
    • Citations: 28
  • Journal article
    D'Amicis R, Bruno R, Panasenco O, Telloni D, Perrone D, Marcucci MF, Woodham L, Velli M, De Marco R, Jagarlamudi V, Coco I, Owen C, Louarn P, Livi S, Horbury T, Andre N, Angelini V, Evans V, Fedorov A, Genot V, Lavraud B, Matteini L, Muller D, O'Brien H, Pezzi O, Rouillard AP, Sorriso-Valvo L, Tenerani A, Verscharen D, Zouganelis Iet al., 2021,

    First Solar Orbiter observation of the Alfvenic slow wind and identification of its solar source

    , Astronomy and Astrophysics: a European journal, Vol: 656, Pages: 1-17, ISSN: 0004-6361

    Context. Turbulence dominated by large-amplitude, nonlinear Alfvén-like fluctuations mainly propagating away from the Sun is ubiquitous in high-speed solar wind streams. Recent studies have demontrated that slow wind streams may also show strong Alfvénic signatures, especially in the inner heliosphere.Aims. The present study focuses on the characterisation of an Alfvénic slow solar wind interval observed by Solar Orbiter between 14 and 18 July 2020 at a heliocentric distance of 0.64 AU.Methods. Our analysis is based on plasma moments and magnetic field measurements from the Solar Wind Analyser (SWA) and Magnetometer (MAG) instruments, respectively. We compared the behaviour of different parameters to characterise the stream in terms of the Alfvénic content and magnetic properties. We also performed a spectral analysis to highlight spectral features and waves signature using power spectral density and magnetic helicity spectrograms, respectively. Moreover, we reconstruct the Solar Orbiter magnetic connectivity to the solar sources both via a ballistic and a potential field source surface (PFSS) model.Results. The Alfvénic slow wind stream described in this paper resembles, in many respects, a fast wind stream. Indeed, at large scales, the time series of the speed profile shows a compression region, a main portion of the stream, and a rarefaction region, characterised by different features. Moreover, before the rarefaction region, we pinpoint several structures at different scales recalling the spaghetti-like flux-tube texture of the interplanetary magnetic field. Finally, we identify the connections between Solar Orbiter in situ measurements, tracing them down to coronal streamer and pseudostreamer configurations.Conclusions. The characterisation of the Alfvénic slow wind stream observed by Solar Orbiter and the identification of its solar source are extremely important aspects for improving the understanding of future observ
  • Journal article
    Allen RC, Cernuda I, Pacheco D, Berger L, Xu ZG, von Forstner JLF, Rodriguez-Pacheco J, Wimmer-Schweingruber RF, Ho GC, Mason GM, Vines SK, Khotyaintsev Y, Horbury T, Maksimovic M, Hadid LZ, Volwerk M, Dimmock AP, Sorriso-Valvo L, Stergiopoulou K, Andrews GB, Angelini V, Bale SD, Boden S, Boettcher S, Chust T, Eldrum S, Espada PP, Lara FE, Evans V, Gomez-Herrero R, Hayes JR, Hellin AM, Kollhoff A, Krasnoselskikh V, Kretzschmar M, Kuehl P, Kulkarni SR, Lees WJ, Lorfevre E, Martin C, O'Brien H, Plettemeier D, Polo OR, Prieto M, Ravanbakhsh A, Sanchez-Prieto S, Schlemm CE, Seifert H, Soucek J, Steller M, Stverak S, Terasa JC, Travnicek P, Tyagi K, Vaivads A, Vecchio A, Yedla Met al., 2021,

    Energetic ions in the Venusian system: Insights from the first Solar Orbiter flyby

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Owen CJ, Foster AC, Bruno R, Livi S, Louarn P, Berthomier M, Fedorov A, Anekallu C, Kataria D, Kelly CW, Lewis GR, Watson G, Bercic L, Stansby D, Suen G, Verscharen D, Fortunato V, Nicolaou G, Wicks RT, Rae IJ, Lavraud B, Horbury TS, O'Brien H, Evans V, Angelini Vet al., 2021,

    Solar Orbiter observations of the structure of reconnection outflow layers in the solar wind

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Fedorov A, Louarn P, Owen CJ, Horbury TS, Prech L, Durovcova T, Barthe A, Rouillard AP, Kasper JC, Bale SD, Bruno R, O'Brien H, Evans V, Angelini V, Larson D, Livi R, Lavraud B, Andre N, Genot V, Penou E, Mele G, Fortunato Vet al., 2021,

    Switchback-like structures observed by Solar Orbiter

    , ASTRONOMY & ASTROPHYSICS, Vol: 656, ISSN: 0004-6361
  • Journal article
    Chust T, Kretzschmar M, Graham DB, Le Contel O, Retino A, Alexandrova A, Berthomier M, Hadid LZ, Sahraoui F, Jeandet A, Leroy P, Pellion J-C, Bouzid V, Katra B, Piberne R, Khotyaintsev Y, Vaivads A, Krasnoselskikh V, Soucek J, Santolik O, Lorfevre E, Plettemeier D, Steller M, Stverak S, Vecchio A, Maksimovic M, Bale SD, Horbury TS, O'Brien H, Evans V, Angelini Vet al., 2021,

    Observations of whistler mode waves by Solar Orbiter's RPW Low Frequency Receiver (LFR): In-flight performance and first results

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