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| Titel |
Letter to the Editor Low-frequency electric field fluctuations and field-aligned electron beams around the edge of an auroral acceleration region |
| VerfasserIn |
W. Miyake, R. Yoshioka, A. Matsuoka, T. Mukai, T. Nagatsuma |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 19, no. 3 ; Nr. 19, no. 3, S.389-393 |
| Datensatznummer |
250014227
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| Publikation (Nr.) |
 copernicus.org/angeo-19-389-2001.pdf |
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| Zusammenfassung |
Electron beams narrowly
collimated to the magnetic field line were observed continuously from a
down-ward current region to an auroral acceleration region (i.e., upward current
region). They were well correlated with low-frequency electric field
fluctuations in the auroral acceleration region as well as in the adjacent
downward current region. Magnetic field fluctuations were found only in the
downward current region. The analysis suggests that static field-aligned
electric fields are not fully responsible for the filed-aligned electron
acceleration; the ac electric field, presumably associated with Alfvenic
fluctuations, should also be involved in the acceleration of ionospheric
electrons.
Key words. Ionosphere (particle
acceleration) – Magnetospheric physics (auroral phenomena;
magnetosphere-ionosphere interactions) |
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