Ionospheric measurements during the CRISTA-MAHRSI campaign: their implications and comparison with previous campaignsReport as inadecuate

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1 Institute of Atmospheric Physics 2 Geophysical Institute 3 Observatori de l-Ebre 4 NIRFI 5 Institute of Atmospheric Physics 6 RAL - STFC Rutherford Appleton Laboratory 7 Communication Research Laboratory 8 INTA 9 IZMIRAN 10 Institute of Solar-Terrestrial Physics 11 Wuhan Institute of Physics 12 Istituto Nazionale di Geofisica

Abstract : 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.

Author: J. La?tovicka - D. Pancheva - D. Altadill - E. A. Benediktov - J. Bo?ka - J. Bremer - M. Dick - K. Igarashi - P. Mlch - B. A. De



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