Zhao, H;
Baker, DN;
Jaynes, AN;
Li, X;
Elkington, SR;
Kanekal, SG;
Spence, HE;
... Forsyth, C; + view all
(2017)
On the relation between radiation belt electrons and solar wind parameters/geomagnetic indices: dependence on the first adiabatic invariant and L*.
Journal of Geophysical Research
, 122
(2)
pp. 1624-1642.
10.1002/2016JA023658.
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Abstract
The relation between radiation belt electrons and solar wind/magnetospheric processes is of particular interest due to both scientific and practical needs. Though many studies have focused on this topic, electron data from Van Allen Probes with wide L shell coverage and fine energy resolution, for the first time, enabled this statistical study on the relation between radiation belt electrons and solar wind parameters/geomagnetic indices as a function of first adiabatic invariant μ and L*. Good correlations between electron phase space density (PSD) and solar wind speed, southward IMF Bz, SYM-H and AL indices are found over wide μ and L* ranges, with higher correlation coefficients and shorter time lags for low-μ electrons than high-μ electrons; the anti-correlation between electron PSD and solar wind proton density is limited to high-μ electrons at high L*. The solar wind dynamic pressure has dominantly positive correlation with low-μ electrons and negative correlation with high-μ electrons at different L*. In addition, electron PSD enhancements also correlate well with various solar wind/geomagnetic parameters, and for most parameters this correlation is even better than that of electron PSD while the time lag is also much shorter. Among all parameters investigated, AL index is shown to correlate the best with electron PSD enhancements, with correlation coefficients up to ~0.8 for low-μ electrons (time lag ~ 0 day) and ~0.7 for high-μ electrons (time lag ~ 1-2 days), suggesting the importance of seed and source populations provided by substorms in radiation belt electron PSD enhancements.
| Type: | Article |
|---|---|
| Title: | On the relation between radiation belt electrons and solar wind parameters/geomagnetic indices: dependence on the first adiabatic invariant and L* |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/2016JA023658 |
| Publisher version: | http://doi.org/10.1002/2016JA023658 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Radiation belt electrons; Solar wind; Geomagnetic storms; Magnetospheric substorms; Phase space density; Radiation belt electron content |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1537352 |
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