Imperial College London
Portrait Picture

Professor Jonathan P. Eastwood

Faculty of Natural Sciences, Department of Physics

Professor of Space Physics
 
 
 
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Contact

 

jonathan.eastwood Website

 
 
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Assistant

 

Mr Luke Kratzmann +44 (0)20 7594 7770

 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Horbury:2020:1538-4365/ab5b15,
author = {Horbury, T and Woolley, T and Laker, R and Matteini, L and Eastwood, J and Bale, SD and Velli, M and Chandran, BDG and Phan, T and Raouafi, NE and Goetz, K and Harvey, PR and Pulupa, M and Klein, KG and De, Wit TD and Kasper, JC and Korreck, KE and Case, AW and Stevens, ML and Whittlesey, P and Larson, D and MacDowall, RJ and Malaspina, DM and Livi, R},
doi = {1538-4365/ab5b15},
journal = {The Astrophysical Journal: an international review of astronomy and astronomical physics},
pages = {1--8},
title = {Sharp Alfvenic impulses in the near-Sun solar wind},
url = {http://dx.doi.org/10.3847/1538-4365/ab5b15},
volume = {246},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Measurements of the near-Sun solar wind by Parker Solar Probe have revealed the presence of largenumbers of discrete Alfv enic impulses with an anti-Sunward sense of propagation.  These are similarto those previously observed near 1 AU, in high speed streams over the Sun’s poles and at 60 solarradii.   At  35  solar  radii,  however,  they  are  typically  shorter  and  sharper  than  seen  elsewhere.   Inaddition, these spikes occur in “patches” and there are also clear periods within the same stream whenthey do not occur; the timescale of these patches might be related to the rate at which the spacecraftmagnetic footpoint tracks across the coronal hole from which the plasma originated.  While the velocityfluctuations associated with these spikes are typically under 100 km/s, due to the rather low Alfv enspeeds in the streams observed by the spacecraft to date, these are still associated with large angulardeflections  of  the  magnetic  field  -  and  these  deflections  are  not  isotropic.   These  deflections  do  notappear to be related to the recently reported large scale, pro-rotation solar wind flow.  Estimates ofthe size and shape of the spikes reveal high aspect ratio flow-aligned structures with a transverse scaleof≈104km.  These events might be signatures of near-Sun impulsive reconnection events.
AU  - Horbury,T
AU  - Woolley,T
AU  - Laker,R
AU  - Matteini,L
AU  - Eastwood,J
AU  - Bale,SD
AU  - Velli,M
AU  - Chandran,BDG
AU  - Phan,T
AU  - Raouafi,NE
AU  - Goetz,K
AU  - Harvey,PR
AU  - Pulupa,M
AU  - Klein,KG
AU  - De,Wit TD
AU  - Kasper,JC
AU  - Korreck,KE
AU  - Case,AW
AU  - Stevens,ML
AU  - Whittlesey,P
AU  - Larson,D
AU  - MacDowall,RJ
AU  - Malaspina,DM
AU  - Livi,R
DO  - 1538-4365/ab5b15
EP  - 8
PY  - 2020///
SN  - 0004-637X
SP  - 1
TI  - Sharp Alfvenic impulses in the near-Sun solar wind
T2  - The Astrophysical Journal: an international review of astronomy and astronomical physics
UR  - http://dx.doi.org/10.3847/1538-4365/ab5b15
UR  - https://iopscience.iop.org/article/10.3847/1538-4365/ab5b15
UR  - http://hdl.handle.net/10044/1/75670
VL  - 246
ER  -
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