Different types of whistler mode chorus in the equatorial source region
2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 20, 8271-8279 p.Article in journal (Refereed) PublishedText
The Time History of Events and Macroscale Interactions during Substorms-D spacecraft crossed an active equatorial source region of whistler mode chorus rising tones on 23 October 2008. Rising tones are analyzed in terms of spectral and polarization characteristics, with special emphasis on wave normal angles. The latter exhibit large variations from quasi-parallel to oblique, even within single bursts, but seem to follow a definite pattern, which enables an unambiguous classification into five different groups. Furthermore, we discuss the frequently observed splitting of chorus bursts into a lower and an upper band around one half of the local electron cyclotron frequency. At chorus frequencies close to the gap, we find significantly lowered wave planarities and a tendency of wave normal angles to approach the Gendrin angle.
Place, publisher, year, edition, pages
2015. Vol. 42, no 20, 8271-8279 p.
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:uu:diva-269259DOI: 10.1002/2015GL066004ISI: 000364782500002OAI: oai:DiVA.org:uu-269259DiVA: diva2:882721