Imperial College London
Professor Quenby

Professor Quenby

Faculty of Natural Sciences, Department of Physics

Distinguished Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 7527j.quenby

 
 
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Location

 

1106Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Webber:2015:1/138,
author = {Webber, WR and Quenby, JJ},
doi = {1/138},
journal = {Astrophysical Journal},
title = {Unusual Galactic Cosmic Ray Intensity and Spectral Changes Observed by V1 Near The Heliopause},
url = {http://dx.doi.org/10.1088/0004-637X/806/1/138},
volume = {806},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We discuss here two unusual increases of cosmic ray intensity that were observed by V1 in the last 1.1 AU before itcrossed the heliopause in 2012 August, at 121.5 AU. These two increases are roughly similar in amplitude andresult in a total increase in ∼1 GV cosmic ray nuclei of over 50% and 0.01 GV electrons of a factor ∼2. During thefirst increase the changes in the B field are small. After the first increase the B field changes become large andduring the second increase the B field variations and cosmic ray changes are correlated to within ± one day. Duringthese time intervals, the rigidity dependence of the increases of GCR H and He nuclei from 100–600 MeV/nucresemble those used to describe the solar modulation near the Earth during a large transient decrease but the ratiobetween the intensity changes of H, He, and electrons are different. The magnitude of these increases at Voyager is∼1/3 of the modulation that is required to produce the total modulation of protons, helium nuclei, and electronsbetween the local interstellar intensities and those observed at the Earth at the 2009 sunspot minima. This mayimply that a significant part of the residual solar modulation at times of sunspot minima occurs near the heliopauseitself.
AU  - Webber,WR
AU  - Quenby,JJ
DO  - 1/138
PY  - 2015///
SN  - 1538-4357
TI  - Unusual Galactic Cosmic Ray Intensity and Spectral Changes Observed by V1 Near The Heliopause
T2  - Astrophysical Journal
UR  - http://dx.doi.org/10.1088/0004-637X/806/1/138
UR  - http://hdl.handle.net/10044/1/25631
VL  - 806
ER  -
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