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High-resolution in situ observations of electron precipitation-causing EMIC waves


AuthorRodger, Craig; Hendry, Aaron; Clilverd, Mark; Kletzing, Craig; Brundell, James; Reeves, Geoffrey;
KeywordsEMIC waves; energetic electron precipitation; radiation belt electrons; Van Allen Probes; wave-particle interactions
AbstractElectromagnetic ion cyclotron (EMIC) waves are thought to be important drivers of energetic electron losses from the outer radiation belt through precipitation into the atmosphere. While the theoretical possibility of pitch angle scattering-driven losses from these waves has been recognized for more than four decades, there have been limited experimental precipitation observations to support this concept. We have combined satellite-based observations of the characteristics of EMIC waves, with satellite and ground-based observations of the EMIC-induced electron precipitation. In a detailed case study, supplemented by an additional four examples, we are able to constrain for the first time the location, size, and energy range of EMIC-induced electron precipitation inferred from coincident precipitation data and relate them to the EMIC wave frequency, wave power, and ion band of the wave as measured in situ by the Van Allen Probes. These observations will better constrain modeling into the importance of EMIC wave-particle interactions.
Year of Publication2015
JournalGeophysical Research Letters
Volume42
Number of Pages9633-9641
Section
Date Published11/2015
ISBN
URLhttp://onlinelibrary.wiley.com/wol1/doi/10.1002/2015GL066581/full
DOI10.1002/grl.v42.2210.1002/2015GL066581