uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
THEMIS observations of long-lived regions of large-amplitude whistler waves in the inner magnetosphere
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2008 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 35, no 17, L17S16- p.Article in journal (Refereed) Published
Abstract [en]

Recent reports of large-amplitude whistler waves (> 100 mV/m) in the radiation belts have intensified interest in the role of whistler waves in accelerating radiation belt electrons to MeV energies. Several critical parameters for addressing this issue have not previously been observed, including the occurrence frequency, spatial extent and longevity of regions of large-amplitude whistlers. The THEMIS mission, with multiple satellites in a near-equatorial orbit, offers an excellent opportunity to study these waves. We use data from the Electric Field Instrument (EFI) to show that in the dawn-side radiation belts, especially near L-shells from 3.5 to 5.5, the probability distribution of wave activity has a significant high-amplitude tail and is hence not well-described by long-term time averages. Regions of enhanced wave activity exhibit four-second averaged wave power above 1 mV/m and sub-second bursts up to several hundred mV/m. These regions are spatially localized to at most several hours of local time azimuthally, but can persist in the same location for several days. With large regions of space persistently covered by bursty, large-amplitude waves, the mechanisms and rates of radiation belt electron acceleration may need to be reconsidered.

Place, publisher, year, edition, pages
2008. Vol. 35, no 17, L17S16- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-149369DOI: 10.1029/2008GL033643ISI: 000256809500001OAI: oai:DiVA.org:uu-149369DiVA: diva2:404892
Available from: 2011-03-18 Created: 2011-03-18 Last updated: 2011-03-18Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Swedish Institute of Space Physics, Uppsala Division
In the same journal
Geophysical Research Letters
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 151 hits
ReferencesLink to record
Permanent link

Direct link