Long-term variations in pulsation activity and their relationship to solar wind velocity, geomagnetic activity, and F2 region electron density

Details Long-term variations in pulsation activity and their relationship to solar wind velocity, geomagnetic activity, and F2 region electron density Long-term variations in pulsation activity and their relationship to solar wind velocity, geomagnetic activity, and F2 region electron density

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621115z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,115-21,123.

Other

6

F 2 Region, Geomagnetic Pulsations, Ionospheric Electron Density, Solar Wind Velocity, Annual Variations, Geomagnetism, Heliosphere, Solar Cycles

Scientific paper

Significant 11-year annual and semiannual variations of the total pulsation activity at the midlatitude station Nagycenk are reported and compared with solar wind velocity, geomagnetic activity, and F2 region electron density. Monthly average data from 1957 through 1989 were analyzed using the discrete convolution filtering technique. The 11-year variation of the total pulsation activity is closely related to the 11-year solar wind cycle supposedly through solar wind controlled pulsations. Its annual variation reflects the combination of two effects: one is the annual variation of the solar wind due to interstellar wind, and the other is some damping mechanism related to F2 region electron density. Occurrence frequency and amplitude data for pulsations in 12 period bands ranging from 1 s up to 10 min were involved in order to clarify the contribution of different types of pulsations to the total pulsation activity. It was found that the total pulsation activity refers mainly to Pc3 pulsations and that the pulsations with a period of 20-25 s, which corresponds to the eigenperiod of field line resonance at L approximately equal to 2, have the strongest correlation with solar wind velocity.

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