Magnetic Local Time-Resolved Examination of Radiation Belt Dynamics during High-Speed Solar Wind Speed-Triggered Substorm Clusters

0509093 - ÚFA 2020 RIV US eng J - Journal Article
Rodger, C. J. - Turner, D. L. - Clilverd, M. A. - Hendry, Aaron
Magnetic Local Time-Resolved Examination of Radiation Belt Dynamics during High-Speed Solar Wind Speed-Triggered Substorm Clusters.
Geophysical Research Letters. Roč. 46, 17-18 (2019), s. 10219-10229. ISSN 0094-8276. E-ISSN 1944-8007
Institutional support: RVO:68378289
Keywords : radiation belt dynamics * radiation belt electrons * radiation belt losses * substorm impacts * magnetopause shadowing * POES * MEPED
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.497, year: 2019
Method of publishing: Limited access
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL083712

Particle observations from low Earth orbiting satellites are used to undertake superposed epoch analysis around clusters of substorms, in order to investigate radiation belt dynamical responses to mild geomagnetic disturbances. Medium energy electrons and protons have drift periods long enough to discriminate between processes occurring at different magnetic local time, such as magnetopause shadowing, plasma wave activity, and substorm injections. Analysis shows that magnetopause shadowing produces clear loss in proton and electron populations over a wide range of L‐shells, initially on the dayside, which interacts with nightside substorm‐generated flux enhancements following charge‐dependent drift directions. Inner magnetospheric injections recently identified as an important source of tens to hundreds keV electrons at low L (L<3), occurring during similar solar wind‐driving conditions as recurrent substorms, show similar but more enhanced geomagnetic AU‐index signatures. Twofold increases in substorm occurrence at the time of the sudden particle enhancements at low L shells (SPELLS) suggest a common linkage.
Permanent Link: http://hdl.handle.net/11104/0299886