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

D. Pancheva (1) , J. La?tovi?ka (2)

1 Geophysical Institute
2 IAP - Institute of Atmospheric Physics [Prague]

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.

Domaines: Océan, Atmosphère; Sciences de la Terre

D. Pancheva, J. La?tovi?ka. Planetary wave activity in the lower ionosphere during CRISTA I campaign in autumn 1994 (October?November). Annales Geophysicae, 1998, 16 (8), pp.1014-1023. ⟨hal-00316435⟩