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| Titel |
Observations of 50-MHz type-II coherent echoes from within the polar cap |
| VerfasserIn |
A. V. Kustov, J. A. Koehler, G. J. Sofko, D. W. Danskin, M. J. McKibben |
| 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 ; 12, no. 8 ; Nr. 12, no. 8, S.765-774 |
| Datensatznummer |
250011034
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| Publikation (Nr.) |
 copernicus.org/angeo-12-765-1994.pdf |
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| Zusammenfassung |
| 50-MHz type-II coherent echoes at geometrical
aspect angles of 11.5° have been observed in the northern polar cap during
pre-noon hours. The echoes had an unusually large Doppler width of 1200-1400 m s-1
and were well correlated with strong magnetic disturbances in the range 500-1000
nT. The dependence of intensity, spectral width and skewness versus radial
velocity were similar to those known from previous experiments at lower
latitudes and at small aspect angles. It is concluded that echo onset was due to
the combination of several factors, including a highly conducting ionosphere,
the presence of a very intense electric field, and strong radar wave refraction. |
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