 |
| Titel |
Particle precipitation during NEIAL events: simultaneous ground based nighttime observations at Svalbard |
| VerfasserIn |
J. Lunde, U. P. Løvhaug, B. Gustavsson |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 5 ; Nr. 27, no. 5 (2009-05-04), S.2001-2010 |
| Datensatznummer |
250016518
|
| Publikation (Nr.) |
 copernicus.org/angeo-27-2001-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this paper we present Naturally Enhanced Ion Acoustic Lines (NEIALs)
observed with the EISCAT Svalbard Radar (ESR) together with auroral
emissions observed with the Meridian Scanning Photometer (MSP). This is the
first report of NEIALs observed during nighttime at Svalbard. Previously,
NEIALs have been associated with a strong red line intensity (>10 kR),
which exceeds the green line intensities. The high intensity in the red line
emission is a sign of abundant low energy electron precipitation. In our
observations, one of the NEIAL events was accompanied by the red line
emissions far below the previously reported intensities. This happened when
the green line intensity exceeds the red line intensity. In this work we
discuss the behaviour of electron precipitation characteristics and optical
emissions during NEIAL events on the nightside, and we suggest that
intensity enhancements in the 844.6 nm emission line could be a better
candidate than the 630.0 nm emission as an optical signature for NEIALs. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|