Mathematics – Logic
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998angeo..16.1014p&link_type=abstract
Annales Geophysicae, vol. 16, Issue 8, pp.1014-1023
Mathematics
Logic
5
Scientific paper
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.
Lastovicka Jan.
Pancheva Dora
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