Global Model of Whistler Mode Chorus in the Near-Equatorial Region (|λm|<  18°)

Author
Keywords
Abstract
We extend our database of whistler mode chorus, based on data from seven satellites, by including ∼3 years of data from Radiation Belt Storm Probes (RBSP)-A and RBSP-B and an additional ∼6 years of data from Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A, THEMIS-D, and THEMIS-E. The new database allows us to probe the near-equatorial region in detail, revealing new features. In the equatorial source region, |λm|<6°, strong wave power is most extensive in the 0.1–0.4fce bands in the region 21–11 magnetic local time (MLT) from the plasmapause out to L∗ = 8 and beyond, especially near dawn. At higher frequencies, in the 0.4–0.6fce frequency bands, strong wave power is more tightly confined, typically being restricted to the postmidnight sector in the region 4<L∗<6. The global distribution of strong chorus wave power changes dramatically with increasing magnetic latitude, with strong chorus waves in the region 12<|λm|<18° predominantly observed at frequencies below 0.3fce in the prenoon sector, in the region 5<L∗<8.
Notes
Year of Publication
2020
Journal
Geophysical Research Letters
Volume
47
Number
Number of Pages
e2020GL087311
Date Published
05/2020
URL
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL087311
DOI
https://doi.org/10.1029/2020GL087311