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| Titel |
High altitude large-scale plasma waves in the equatorial electrojet at twilight |
| VerfasserIn |
J. L. Chau, D. L. Hysell |
| 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 ; 22, no. 12 ; Nr. 22, no. 12 (2004-12-22), S.4071-4076 |
| Datensatznummer |
250015074
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| Publikation (Nr.) |
 copernicus.org/angeo-22-4071-2004.pdf |
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| Zusammenfassung |
Jicamarca radar observations of a new class of large-scale plasma
waves in the equatorial electrojet (EEJ) are presented and
characterized. The study is based on long-term (204 days),
single-baseline interferometry observations made in 2003 using a
low-power radar mode, also known as JULIA mode, along with a few
hours of observations made in an aperture synthesis imaging mode.
The large-scale waves are found to occur at high altitudes in the
E-region, mainly between 120 and 140km, around twilight
(between 18:30 and 20:00 LT), with durations of a few minutes to an
hour. In our long-term observations, these large-scale waves occur
very often (between 1 and 5 out 10 nights), drift westward
(~70 ms–1), exhibit very narrow spectral widths, and have
both positive and negative Doppler shifts. The imaging results
show that the large-scale waves occur along tilted bands that
sweep westward and downward (~30–60ms–1), with a horizontal
separation between bands of about 10–15km. The cause of the
waves remains unknown.
Key words. Ionosphere (ionospheric irregularities; equatorial
ionosphere; instruments and techniques) |
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