Timescale for radiation belt electron acceleration by whistler mode chorus waves

摘要: [1] Electron acceleration inside the Earth's magnetosphere is required to explain increases in ∼MeV radiation belt electron flux during magnetically disturbed periods. Recent studies show that by whistler mode chorus waves becomes most efficient just outside plasmapause, near L = 4.5, where peaks phase space density are observed. We present CRRES data on spatial distribution of emissions active conditions. The wave used calculate pitch angle and energy diffusion rates three magnetic local time (MLT) sectors obtain a timescale for acceleration. prenoon sector accelerate electrons efficiently at latitudes above 15° equatorial angles between 20° 60°. As drift around Earth, they scattered large further accelerated nightside region. increase 1 MeV an order magnitude approximately day, agreement with satellite observations recovery storms. During undergo many orbits resulting distributions energy-dependent. Chorus scattering should produce either flat-topped or butterfly-shaped. results provide strong support theory.