Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1702b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1702
Physics
[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
The statistical distribution of chorus wave power in the off-equatorial region is evaluated using data from the Plasma Wave Instrument (PWI) Sweep Frequency Receiver (SFR) onboard the Polar spacecraft. Maps of average wave power in the meridional plane divided into four local time sectors are presented. The geomagnetic dependence of wave power is examined, where substorm activity and enhanced solar wind speed are found to result in distinctly different wave distributions. These results are consistent with enhancement of dayside chorus during elevated solar wind conditions, while substorm activity produces enhancement on both the morning and day-sides. The maximum latitudinal extent of chorus as function of latitude and L* is estimated within the orbital constraints of the spacecraft. Based on this, the corresponding maximum resonant energy for first-order relativistic cyclotron resonance is calculated using a realistic magnetic field model. This results in the apparently most favorable region for interaction of chorus with MeV electrons appears to be ~4-10 MLT for L*<7, noting that Polar observations here are limited to L*<5. This is the result of the high latitudinal extent of chorus waves combined with low plasma density and a more dipolar field geometry in the late morning sector. This result is consistent with the current picture for MeV microburst precipitation.
Bunch Nicholas L.
Shprits Yuri Y.
Spasojevic Maria
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