SM035-05
Global Model of Whistler Mode Chorus in the Near-Equatorial Region (|λm| < 18o)
Global Model of Whistler Mode Chorus in the Near-Equatorial Region (|λm| < 18o)
Monday, 14 December 2020: 07:12
Virtual
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| < 6o, 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| < 18o predominantly observed at frequencies below 0.3fce in the prenoon sector, in the region 5 < L* < 8. The new model will lead to more accurate space weather models and forecasts and will also enable more accurate testing of current theories on the generation and propagation of whistler mode chorus in the near-equatorial region of the inner magnetosphere.
~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| < 6o, 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| < 18o predominantly observed at frequencies below 0.3fce in the prenoon sector, in the region 5 < L* < 8. The new model will lead to more accurate space weather models and forecasts and will also enable more accurate testing of current theories on the generation and propagation of whistler mode chorus in the near-equatorial region of the inner magnetosphere.