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| Titel |
Ionospheric measurements during the CRISTA/MAHRSI campaign: their implications and comparison with previous campaigns |
| VerfasserIn |
J. Laštovička, D. Pancheva, D. Altadill, E. A. Benediktov, J. Boška, J. Bremer, M. Dick, K. Igarashi, P. Mlch, B. A. Morena, Z. T. Rapoport, V. A. Vyakhirev, B. O. Vugmeister, X. Zhang, B. Zolesi |
| 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 ; 17, no. 8 ; Nr. 17, no. 8, S.1040-1052 |
| Datensatznummer |
250013798
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1040-1999.pdf |
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| Zusammenfassung |
The CRISTA/MAHRSI experiment on board a space
shuttle was accompanied by a broad campaign of rocket, balloon and ground-based
measurements. Supporting lower ionospheric ground-based measurements were run in
Europe and Eastern Asia between 1 October-30 November, 1994. Results of
comparisons with long ionospheric data series together with short-term
comparisons inside the interval October-November, 1994, showed that the upper
middle atmosphere
(h = 80-100 km) at middle latitudes of the Northern Hemisphere in the
interval of the CRISTA/MAHRSI experiment (4-12 November, 1994) was very close to
its expected climatological state. In other words, the average results of the
experiment can be used as climatological data, at least for the given
area/altitudes. The role of solar/geomagnetic and "meteorological"
control of the lower ionosphere is investigated and compared with the results of
MAP/WINE, MAC/SINE and DYANA campaigns. The effects of both solar/geomagnetic
and global meteorological factors on the lower ionosphere are found to be weak
during autumn 1994 compared to those in MAP/WINE and DYANA winters, and they are
even slightly weaker than those in MAP/SINE summer. The comparison of the four
campaigns suggests the following overall pattern: in winter the lower ionosphere
at northern middle latitudes appears to be fairly well
"meteorologically" controlled with a very weak solar influence. In
summer, solar influence is somewhat stronger and dominates the weak
"meteorological" influence, but the overall solar/meteorological
control is weaker than in winter. In autumn we find the weakest overall
solar/meteorological control, local effects evidently dominate.
Key words. Ionosphere (ionosphere · atmosphere
interactions; mid-latitude ionosphere) |
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