Observations of an upward-directed electron beam with the perpendicular temperature of the cold ionosphere
1995 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 22, 2103-2106 p.Article in journal (Refereed) Published
The Freja TESP electron spectrometer has repeatedly observed similar to 100 eV - 1 keV upward-directed, anti-field-aligned electron beams near 1700 km altitude in the auroral zone. A particularly intense event, at energies up to 2 keV, is described. The beam perpendicular temperature T perpendicular to(e)), was as low as 0.1-0.2 eV at 100-200 eV parallel energy. The 10-15 s period of upward fluxes was coincident with a low density (similar to 10 cm(-3)) period and a similar to 5 keV ion conic. Strong low frequency waves and the lack of any downward motion in the simultaneously observed ion conic suggest a strong element of wave acceleration, while electric field and ion loss cone measurements provide limited evidence of potential acceleration to a fraction of the observed energies.
Place, publisher, year, edition, pages
1995. Vol. 22, 2103-2106 p.
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-91837DOI: 10.1029/95GL01777OAI: oai:DiVA.org:kth-91837DiVA: diva2:511351
NR 201408052012-03-212012-03-212012-03-21Bibliographically approved