Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 3, Pages 755-761Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL059181
Keywords
Chorus Wave Distributions; Time-dependent global chorus maps; Van Allen Probes; Precipitation Electrons; Low-Earth-orbit; Radiation Belts
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Funding
- NASA Living With a Star Program [07-LWS07-00054]
- US Department of Energy through the LANL Laboratory Directed Research and Development (LDRD) program [20130297ER]
- UCOP Lab Fees Program [12-LF- 235337]
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Substorm injected electrons (several-100skeV) produce whistler-mode chorus waves that are thought to have a major impact on the radiation belts by causing both energization and loss of relativistic electrons in the outer belt. High-altitude measurements, such as those from the Van Allen Probes, provide detailed wave measurements at a few points in the magnetosphere. But physics-based models of radiation-belt dynamics require knowledge of the global distribution of chorus waves. We demonstrate that time-dependent, global distributions of near-equatorial chorus wave intensities can be inferred from low-Earth-orbit (LEO) measurements of precipitating low-energy electrons. We compare in situ observations of near-equatorial chorus waves with LEO observations of precipitating electrons and derive a heuristic formula that relates, quantitatively, electron precipitation fluxes to chorus wave intensities. Finally, we demonstrate how that formula can be applied to LEO precipitation measurements and in situ Van Allen Probes wave measurements to provide global, data-driven inputs for radiation belt models.
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