Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611455s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,455-11,460.
Physics
Extremely Low Frequencies, Solar Activity Effects, Vlf Emission Recorders, Conjugate Points, Geomagnetism, Magnetosphere-Ionosphere Coupling
Scientific paper
Characteristics of the long-term variation of daytime (06-16 hours MLT) ELF-VLF emissions at 750 Hz and 2 kHz are examined. The emission intensity shows obvious quasi-periodic fluctations, with periods of 1 day, about 27 days, 1 year, and about 11 years. The diurnal and seasonal variations are strongly dependent on sunlight in the topside ionosphere. The emission intensity is also affected by geomagnetic activity with quasi-periodicities of about 27 days and about 11 years. It is suggested that sunlight in the ionosphere affects the propagation of waves whereas the solar activity affects their generation.
Maezawa Kiyoshi
Saemundsson Thorsteinn
Sasahara Toshiya
Sato Natsuo
Suzuki Hiroyuki
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