ProfessorTimothyHorbury

Brown P, Beek T, Carr C, O'Brien H, Cupido E, Oddy T, Horbury TSet al., 2012, Magnetoresistive magnetometer for space science applications (vol 23, 025902, 2012), MEASUREMENT SCIENCE AND TECHNOLOGY, Vol: 23, ISSN: 0957-0233

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• Citations: 7

Wicks RT, Forman MA, Horbury TS, Oughton Set al., 2012, POWER ANISOTROPY IN THE MAGNETIC FIELD POWER SPECTRAL TENSOR OF SOLAR WIND TURBULENCE, ASTROPHYSICAL JOURNAL, Vol: 746, ISSN: 0004-637X

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• Citations: 29

Brown P, Beek T, Carr C, O'Brien H, Cupido E, Oddy T, Horbury TSet al., 2012, Magnetoresistive magnetometer for space science applications, MEASUREMENT SCIENCE AND TECHNOLOGY, Vol: 23, ISSN: 0957-0233

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• Citations: 30

Pogorelsky IV, Dover NP, Babzien M, Bell AR, Dangor AE, Horbury T, Palmer CAJ, Polyanskiy M, Schreiber J, Schwartz S, Shkolnikov P, Yakimenko V, Najmudin Zet al., 2012, Ion Acceleration by Laser Hole-Boring into Plasmas, 15th Workshop on Advanced Accelerator Concepts (AAC), Publisher: AMER INST PHYSICS, Pages: 814-819, ISSN: 0094-243X

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• Citations: 6

Lee Y, Jin H, Seon J, Chae KS, Lee DH, Glaser DL, Immel TJ, Lin RP, Sample JG, Horbury TS, Brown Pet al., 2011, Development of CubeSat for space science mission: Cinema, Pages: 3658-3662

We are developing three identical cubesats for space science mission called TRIO-CINEMA(TRiplet Ionospheric Observatory-Cubesat for Ion, Neutral, Electron, and MAgnetic fields). Three institutes participate in the CINEMA: School of Space Research at Kyung Hee University, Space Science Laboratory at University of California, Berkeley, and Imperial College London. CINEMA has a 3U cubesat platform; the volume is 100 x 100 x 340.5 mm. The mass is about 3 kg, and power is 3 W. The three CINEMA cubesats each carry a suprathermal electron, ion, neutral (STEIN) instrument to provide stereo Energetic Neutral Atom (ENA) imaging of the ring current and multi-point in situ measurements of suprathermal electrons and ions, and dual 3-axis magnetometers of magnetoresistive sensors, one at the end of 1-m long stacer boom, to measure magnetic fields and, the other within the spacecraft to measure the fields for attitude control. STEIN uses an array of silicon detectors, with heritage from the STEREO mission, behind an electrostatuic deflection system, to detect ∼ 2 to 200 keV electrons, ions, and ENAs. CINEMA consists of communication modules, avionics bus, solar panels, and the scientific instruments. The spacecraft is spin-stabilized at a spin rate of 4 RPM. The attitude information is derived by two sun sensors and inboard magnetometer. The spacecraft sends the data through S-band transmitter and receives commands from the ground station via UHF receiver. In this paper, we introduce the system design and the qualification model for CINEMA. Copyright ©2011 by the International Astronautical Federation. All rights reserved.

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• Citations: 2

Horbury TS, Wicks RT, Chen CHK, 2011, Anisotropy in Space Plasma Turbulence: Solar Wind Observations, Space Science Reviews, Vol: 172, Pages: 325-342, ISSN: 0038-6308

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Eastwood JP, Schwartz SJ, Horbury TS, Carr CM, Glassmeier K-H, Richter I, Koenders C, Plaschke F, Wild JAet al., 2011, Transient Pc3 wave activity generated by a hot flow anomaly: Cluster, Rosetta, and ground-based observations, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 116, ISSN: 2169-9380

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• Citations: 37

Chen CHK, Mallet A, Yousef TA, Schekochihin AA, Horbury TSet al., 2011, Anisotropy of Alfvénic Turbulence in the Solar Wind and Numerical Simulations, Monthly Notices of the Royal Astronomical Society, Vol: 415, Pages: 3219-3226, ISSN: 0035-8711

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Forman MA, Wicks RT, Horbury TS, 2011, DETAILED FIT OF "CRITICAL BALANCE" THEORY TO SOLAR WIND TURBULENCE MEASUREMENTS, ASTROPHYSICAL JOURNAL, Vol: 733, ISSN: 0004-637X

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• Citations: 73

Owens MJ, Wicks RT, Horbury TS, 2011, Magnetic Discontinuities in the Near-Earth Solar Wind: Evidence of In-Transit Turbulence or Remnants of Coronal Structure?, SOLAR PHYSICS, Vol: 269, Pages: 411-420, ISSN: 0038-0938

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• Citations: 43

Wicks RT, Horbury TS, Chen CHK, Schekochihin AAet al., 2011, Anisotropy of Imbalanced Alfvenic Turbulence in Fast Solar Wind, Physical Review Letters, Vol: 106, Pages: 045001-045001, ISSN: 0031-9007

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Wicks RT, Horbury TS, Chen CHK, Schekochihin AAet al., 2010, Power and Spectral Index Anisotropy of the Entire Inertial Range of Turbulence in the Fast Solar Wind, Monthly Notices of the Royal Astronomical Society, Vol: 407, Pages: L31-L35, ISSN: 0035-8711

We measure the power and spectral index anisotropy of magnetic field fluctuations in fast solar wind turbulence from scales larger than the outer scale down to the ion gyroscale, thus covering the entire inertial range. We show that the power and spectral indices above the outer scale of turbulence are approximately isotropic. The turbulent cascade causes the power anisotropy at smaller scales manifested by anisotropic scalings of the spectrum: close to k−5/3 across and k−2 along the local magnetic field, consistent with a critically balanced Alfvénic turbulence. By using data at different radial distances from the Sun and calculating the radial dependence of the ratio of the outer scale to the ion gyroscale, we show that the width of the inertial range does not change with heliocentric distance. At the smallest scales of the inertial range, close to the ion gyroscale, we find an enhancement of power parallel to the magnetic field direction coincident with a decrease in the perpendicular power. This is most likely related to energy injection by ion kinetic modes such as the firehose instability and also marks the beginning of the kinetic range, sometimes called the dissipation range, of solar wind turbulence.

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Chen CHK, Horbury TS, Schekochihin AA, Wicks RT, Alexandrova O, Mitchell Jet al., 2010, Anisotropy of Solar Wind Turbulence between Ion and Electron Scales, Physical Review Letters, Vol: 104, Pages: 255002-255002, ISSN: 0031-9007

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Owens MJ, Horbury TS, Arge CN, 2010, PROBING THE LARGE-SCALE TOPOLOGY OF THE HELIOSPHERIC MAGNETIC FIELD USING JOVIAN ELECTRONS, ASTROPHYSICAL JOURNAL, Vol: 714, Pages: 1617-1623, ISSN: 0004-637X

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• Citations: 6

Chen CHK, Wicks RT, Horbury TS, Schekochihin AAet al., 2010, Interpreting Power Anisotropy Measurements in Plasma Turbulence, The Astrophysical Journal Letters, Vol: 711, Pages: L79-L83, ISSN: 2041-8205

A relationship is derived between power anisotropy and wavevector anisotropy in turbulent fluctuations. This can be used to interpret plasma turbulence measurements, for example, in the solar wind. If fluctuations are spatially anisotropic, then the ion gyroscale break point in measured spectra in the directions parallel and perpendicular to the magnetic field would not occur at the same frequency, and similarly for the electron gyroscale break point. This is an important consideration when interpreting solar wind measurements in terms of anisotropic turbulence theories. Model magnetic field power spectra are presented assuming a cascade of critically balanced Alfvén waves in the inertial range and kinetic Alfvén waves in the dissipation range. The variation of power anisotropy with scale is compared to existing solar wind measurements, and the similarities and differences are discussed.

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Wicks RT, Owens MJ, Horbury TS, 2010, The Variation of SolarWind Correlation Lengths OverThree Solar Cycles, Solar Physics, Vol: 262, Pages: 191-198, ISSN: 0038-0938

We present the results of a study of solar wind velocity and magnetic field correlation lengths over the last 35 years. The correlation length of the magnetic field magnitude λ|B| increases on average by a factor of two at solar maxima compared to solar minima. The correlation lengths of the components of the magnetic field λBXYZ and of the velocity λVYZ do not show this change and have similar values, indicating a continual turbulent correlation length of around 1.4 × 106 km. We conclude that a linear relation between λ|B|, VB2, and Kp suggests that the former is related to the total magnetic energy in the solar wind and an estimate of the average size of geoeffective structures, which is, in turn, proportionalto VB2. By looking at the distribution of daily correlation lengths we show that the solarminimum values of λ|B| correspond to the turbulent outer scale. A tail of larger λ|B| values is present at solar maximum causing the increase in mean value.

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Baumjohann W, Matsuoka A, Magnes W, Glassmeier K-H, Nakamura R, Biernat H, Delva M, Schwingenschuh K, Zhang T, Auster H-U, Fornacon K-H, Richter I, Balogh A, Cargill P, Carr C, Dougherty M, Horbury TS, Lucek EA, Tohyama F, Takahashi T, Tanaka M, Nagai T, Tsunakawa H, Matsushima M, Kawano H, Yoshikawa A, Shibuya H, Nakagawa T, Hoshino M, Tanaka Y, Kataoka R, Anderson BJ, Russell CT, Motschmann U, Shinohara Met al., 2010, Magnetic field investigation of Mercury's magnetosphere and the inner heliosphere by MMO/MGF, PLANETARY AND SPACE SCIENCE, Vol: 58, Pages: 279-286, ISSN: 0032-0633

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• Citations: 24

Glassmeier K-H, Auster H-U, Heyner D, Okrafka K, Carr C, Berghofer G, Anderson BJ, Balogh A, Baumjohann W, Cargill P, Christensen U, Delva M, Dougherty M, Fornacon K-H, Horbury TS, Lucek EA, Magnes W, Mandea M, Matsuoka A, Matsushima M, Motschmann U, Nakamura R, Narita Y, O'Brien H, Richter I, Schwingenschuh K, Shibuya H, Slavin JA, Sotin C, Stoll B, Tsunakawa H, Vennerstrom S, Vogt J, Zhang Tet al., 2010, The fluxgate magnetometer of the BepiColombo Mercury Planetary Orbiter, PLANETARY AND SPACE SCIENCE, Vol: 58, Pages: 287-299, ISSN: 0032-0633

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• Citations: 63

Mazelle C, Lembege B, Morgenthaler A, Meziane K, Horbury TS, Genot V, Lucek EA, Dandouras Iet al., 2010, Self-Reformation of the Quasi-Perpendicular Shock: CLUSTER Observations, 12th International Solar Wind Conference, Publisher: AMER INST PHYSICS, Pages: 471-+, ISSN: 0094-243X

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• Citations: 49

Osman KT, Horbury TS, 2009, Quantitative estimates of the slab and 2-D power in solar wind turbulence using multispacecraft data, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 114, ISSN: 2169-9380

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• Citations: 38

Horbury TS, Lucek EA, 2009, Size, shape, and orientation of magnetosheath mirror mode structures, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 114, ISSN: 2169-9380

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• Citations: 25

Horbury TS, Lucek EA, 2009, Size, shape, and orientation of magnetosheath mirror mode structures, Journal of Geophysical Research: Space Physics, Vol: 114

Information about the size, shape, and orientation of mirror mode structures in the magnetosheath is obtained by combining data from the four Cluster spacecraft, resulting in an estimate of the form of the magnetic field magnitude spatial autocorrelation function. It . is shown that the longest direction of the structures is typically inclined at around 30° from the local magnetic field direction, consistent with predictions based on linear growth theory; their smallest size is also consistent with these predictions. The ratio of the longest to shortest scales of the structures is typically 2-6, with some evidence for this value to decrease as the structures are carried downstream. This suggests that the mirror modes are generated as long structures, but gradually become isotropic, possibly as part of their nonlinear growth. In common with earlier work, we find that the direction in which the structures are shortest is typically well aligned with the local magnetopause normal, consistent with compression against this boundary. However, the maximum variance direction is not a good proxy for the long axis of the structures, typically lying around 25° from it. Copyright 2009 by the American Geophysical Union.

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• Citations: 25

Turck-Chieze S, Lamy P, Carr C, Carton PH, Chevalier A, Dandouras I, Defise JM, Dewitte S, de Wit TD, Halain JP, Hasan S, Hochedez JF, Horbury T, Levacher P, Meissonier M, Murphy N, Rochus P, Ruzmaikin A, Schmutz W, Thuillier G, Vives Set al., 2009, The DynaMICCS perspective A mission for a complete and continuous view of the Sun dedicated to magnetism, space weather and space climate, EXPERIMENTAL ASTRONOMY, Vol: 23, Pages: 1017-1055, ISSN: 0922-6435

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• Citations: 17

Schwartz SJ, Horbury T, Owen C, Baumjohann W, Nakamura R, Canu P, Roux A, Sahraoui F, Louarn P, Sauvaud J-A, Pin c con J-L, Vaivads A, Marcucci MF, Anastasiadis A, Fujimoto M, Escoubet P, Taylor M, Eckersley S, Allouis E, Perkinson M-Cet al., 2009, Cross-scale: multi-scale coupling in space plasmas, Experimental Astronomy, Vol: 23, Pages: 1001-1015-1001-1015

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Wimmer-Schweingruber RF, McNutt R, Fahr H, Fichtner H, Heber B, Mall U, Mann I, Marsch E, Glassmeier KH, Kunow H, Klecker B, Woch J, Srama R, Scherer K, Witte M, Wimmer-Schweingruber RF, Droege W, Leipold M, Mannheim K, Schlickeiser R, Wurz P, Bochsler P, Steiger RV, Geiss J, Lallement R, Bougeret JL, Quemerais E, Maksimovic M, Briand C, Bruno R, Bavassano B, Zimbardo G, Velli M, Sorriso-Valvo L, Casolino M, Rucker H, Breitschwerdt D, Hansteen V, Lie-Svendsen O, Horbury T, Balogh A, Forsyth R, Krimigis S, Torsti J, Kocharov L, Valtonen E, Kyrölä E, Janhunen P, Laitinen T, Schmidt W, Ratkiewicz R, Czechowski A, Bzowski M, Barabash S, Izmodenov V, Baranov VB, Malama YG, Chalov S, Alexashov D, Kolesnikov I, Provornikova E, Yermolaev Y, Panasyuk M, Zank G, Moebius E, Zurbuchen T, Mason G, Hill ME, Mazur J, Gloeckler G, Mewaldt R, Lee M, Liewer P, Lin R, Bale S, McComas D, Funsten H, Schwadron N, Opher M, Allegrini F, Le Roux J, Desai M, Frisch P, Fuselier S, Gruntman M, Trattner KH, Slavin J, Burger A, Potgieter M, Ferreira S, Cairns I, Sreenivasan S, Ip Wet al., 2009, The interstellar heliopause probe: Heliospheric boundary explorer mission to the interstellar medium, Pages: 17-24, ISSN: 0167-9295

The Sun, driving a supersonic solar wind, cuts out of the local interstellar medium a giant plasma bubble, the heliosphere. ESA, jointly with NASA, has had an important role in the development of our current understanding of the Suns' immediate neighborhood. Ulysses is the only spacecraft exploring the third, out-of-ecliptic dimension, while SOHO has allowed us to better understand the influence of the Sun and to image the glow of interstellar matter in the heliosphere. Voyager 1 has recently encountered the innermost boundary of this plasma bubble, the termination shock, and is returning exciting yet puzzling data of this remote region. The next logical step is to leave the heliosphere and to thereby map out in unprecedented detail the structure of the outer heliosphere and its boundaries, the termination shock, the heliosheath, the heliopause, and, after leaving the heliosphere, to discover the true nature of the hydrogen wall, the bow shock, and the local interstellar medium beyond. This will greatly advance our understanding of the heliosphere that is the best-known example for astrospheres as found around other stars. Thus, IHP/HEX will allow us to discover, explore, and understand fundamental astrophysical processes in the largest accessible plasma laboratory, the heliosphere. © Springer Science+Business Media B.V. 2009.

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• Citations: 9

Owens MJ, Crooker NU, Horbury TS, 2009, The expected imprint of flux rope geometry on suprathermal electrons in magnetic clouds, ANNALES GEOPHYSICAE, Vol: 27, Pages: 4057-4067, ISSN: 0992-7689

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• Citations: 5

Baumjohann W, Horbury T, Schwartz S, Canu P, Louarn P, Fujimoto M, Nakamura R, Owen C, Roux A, Vaivads Aet al., 2009, The Cross-Scale Mission, International Conference on Future Perspectives of Space Plasma and Particle Instrumentation and International Collaborations, Publisher: AMER INST PHYSICS, Pages: 25-+, ISSN: 0094-243X

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Osman KT, Horbury TS, 2009, Multi-spacecraft measurement of anisotropic power levels and scaling in solar wind turbulence, ANNALES GEOPHYSICAE, Vol: 27, Pages: 3019-3025, ISSN: 0992-7689

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• Citations: 29

Owens MJ, Arge CN, Crooker NU, Schwadron NA, Horbury TSet al., 2008, Estimating total heliospheric magnetic flux from single-point in situ measurements, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 113, ISSN: 2169-9380

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• Citations: 57

Owens MJ, Crooker NU, Schwadron NA, Horbury TS, Yashiro S, Xie H, St Cyr OC, Gopalswamy Net al., 2008, Conservation of open solar magnetic flux and the floor in the heliospheric magnetic field, GEOPHYSICAL RESEARCH LETTERS, Vol: 35, ISSN: 0094-8276

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• Citations: 52