Journal article
EMIC wave scale size in the inner magnetosphere: Observations from the dual Van Allen Probes
Geophysical research letters, Vol.44(3), pp.1227-1233
02/16/2017
DOI: 10.1002/2016GL072316
Abstract
Estimating the spatial scales of electromagnetic ion cyclotron (EMIC) waves is critical for quantifying their overall scattering efficiency and effects on thermal plasma, ring current, and radiation belt particles. Using measurements from the dual Van Allen Probes in 2013–2014, we characterize the spatial and temporal extents of regions of EMIC wave activity and how these depend on local time and radial distance within the inner magnetosphere. Observations are categorized into three types—waves observed by only one spacecraft, waves measured by both spacecraft simultaneously, and waves observed by both spacecraft with some time lag. Analysis reveals that dayside (and H+ band) EMIC waves more frequently span larger spatial areas, while nightside (and He+ band) waves are more often localized but can persist many hours. These investigations give insight into the nature of EMIC wave generation and support more accurate quantification of their effects on the ring current and outer radiation belt.
Key Points
EMIC wave active region scales are determined in the inner magnetosphere
Multipoint Van Allen Probe measurements are used to disentangle spatial and temporal variations
Dayside, H+ band waves occur over larger areas, while nightside, He+ band waves are more localized
Details
- Title: Subtitle
- EMIC wave scale size in the inner magnetosphere: Observations from the dual Van Allen Probes
- Creators
- L. W Blum - Goddard Space Flight CenterJ. W Bonnell - University of California, BerkeleyO Agapitov - University of California, BerkeleyK Paulson - University of New HampshireC Kletzing - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.44(3), pp.1227-1233
- DOI
- 10.1002/2016GL072316
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 7
- Grant note
- JHU/APL (922613) NASA (NNX16AF85G)
- Language
- English
- Date published
- 02/16/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984200058502771
Metrics
10 Record Views