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| Titel |
Statistical characteristics of Doppler spectral width as observed by the conjugate SuperDARN radars |
| VerfasserIn |
K. Hosokawa, E. E. Woodfield, Mark Lester, S. E. Milan, N. Sato, A. S. Yukimatu, T. Iyemori |
| 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 ; 20, no. 8 ; Nr. 20, no. 8, S.1213-1223 |
| Datensatznummer |
250014445
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| Publikation (Nr.) |
 copernicus.org/angeo-20-1213-2002.pdf |
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| Zusammenfassung |
We performed a
statistical analysis of the occurrence distribution of Doppler spectral width
around the day-side high-latitude ionosphere using data from the conjugate
radar pair composed of the CUTLASS Iceland-East radar in the Northern
Hemisphere and the SENSU Syowa-East radar in the Southern Hemisphere. Three
types of spectral width distribution were identified: (1) an exponential-like
distribution in the lower magnetic latitudes (below 72°), (2) a Gaussian-like
distribution around a few degrees magnetic latitude, centered on 78°, and (3)
another type of distribution in the higher magnetic latitudes (above 80°). The
first two are considered to represent the geophysical regimes such as the LLBL
and the cusp, respectively, because they are similar to the spectral width
distributions within the LLBL and the cusp, as classified by Baker et al.
(1995). The distribution found above 80° magnetic latitude has been clarified
for the first time in this study. This distribution has similarities to the
exponential-like distribution in the lower latitude part, although clear
differences also exist in their characteristics. These three spectral width
distributions are commonly identified in conjugate hemispheres. The latitudinal
transition from one distribution to another exhibits basically the same trend
between two hemispheres. There is, however, an interhemispheric difference in
the form of the distribution around the cusp latitudes, such that spectral
width values obtained from Syowa-East are larger than those from Iceland-East.
On the basis of the spectral width characteristics, the average locations of
the cusp and the open/closed field line boundary are estimated statistically.
Key words. Ionosphere
(ionosphere-magnetosphere inter-actions; plasma convection) – Magnetospheric
physics (magnetopause, cusp, and boundary layers) |
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