Ionospheric disturbances in the years of solar activity minimum and their influence on HF radiowave propagation

Details Ionospheric disturbances in the years of solar activity minimum and their influence on HF radiowave propagation Ionospheric disturbances in the years of solar activity minimum and their influence on HF radiowave propagation

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ge%26ae..49.1249k&link_type=abstract

Geomagnetism and Aeronomy, Volume 49, Issue 8, pp.1249-1253

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The oblique sounding data at the Magadan-Irkutsk and Norilsk-Irkutsk paths together with the vertical sounding at stations located in northeastern Russia were used to analyze ionospheric disturbances in September 2005 and during geophysically active period in December 2006. It is found that during the main phase of magnetic storms, wave disturbances with a period of 2-4 h are registered. These disturbances cause variations in the layer maximum height up to 40-100 km and in the critical frequency up to 1.5-2 MHz. Those variations change substantially values of the maximum observed frequencies (MOF) of the ionospheric radio channel at the paths considered. Such wave disturbances can be caused by generation of AGWs in the auroral zone and their propagation to equatorial latitudes.

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