GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Pitch Angle Distribution Evolution of Energetic Electrons by Whistler-Mode Chorus

Details GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Pitch Angle Distribution Evolution of Energetic Electrons by Whistler-Mode Chorus GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Pitch Angle Distribution Evolution of Energetic Electrons by Whistler-Mode Chorus

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008chphl..25.3515z&link_type=abstract

Chinese Physics Letters, Volume 25, Issue 9, pp. 3515-3518 (2008).

Physics

11

Scientific paper

We develop a two-dimensional momentum and pitch angle code to solve the typical Fokker-Planck equation which governs wave—particle interaction in space plasmas. We carry out detailed calculations of momentum and pitch angle diffusion coefficients, and temporal evolution of pitch angle distribution for a band of chorus frequency distributed over a standard Gaussian spectrum particularly in the heart of the Earth's radiation belt L = 4.5, where peaks of the electron phase space density are observed. We find that the Whistler-mode chorus can produce significant acceleration of electrons at large pitch angles, and can enhance the phase space density for energies of 0.5 ∞ 1 MeV by a factor of 10 or above after about 24h. This result can account for observation of significant enhancement in flux of energetic electrons during the recovery phase of a geomagnetic storm.

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