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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 8
Ann. Geophys., 16, 1014-1023, 1998
https://doi.org/10.1007/s00585-998-1014-9
© European Geosciences Union 1998
Ann. Geophys., 16, 1014-1023, 1998
https://doi.org/10.1007/s00585-998-1014-9
© European Geosciences Union 1998

  31 Aug 1998

31 Aug 1998

Planetary wave activity in the lower ionosphere during CRISTA I campaign in autumn 1994 (October−November)

D. Pancheva1 and J. Laštovička2 D. Pancheva and J. Laštovička
  • 1Geophysical Institute, Bulg. Acad. Sci., Acad. G. Bonchev str.'' bl.3, BG-1113 Sofia, Bulgaria
  • 2Institute of Atmospheric Physics, Acad. Sci. Czech Rep., Bočni II, CR-14131 Prague 4, Czech Republic

Abstract. On the basis of MEM spectrum analysis, the main planetary scale fluctuations formed in the lower ionosphere are studied over a period of 3–25 days during the CRISTA campaign (October-November 1994). Three dominant period bands are found: 3–5, 6–8 and 15–23 (mainly 16–18) days. For 7–8 and 16–18 day fluctuations, propagation was eastward with wave numbers K = 3 and K = 1, respectively. The magnitude of planetary wave activity in the mid-latitudes of the Northern Hemisphere during the CRISTA campaign seems to be fairly consistent with the expected undisturbed normal/climatological state of the atmosphere at altitudes of 80–100 km.

Key words. Ionosphere (ionosphere-atmosphere interactions) · Meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides)

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