Solar influence on ELF-VLF emission observed at conjugate stations

Details Solar influence on ELF-VLF emission observed at conjugate stations Solar influence on ELF-VLF emission observed at conjugate stations

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611455.&link_type=abstract

Journal of Geophysical Research, Volume 96, Issue A7, p. 11455-11460

Physics

1

Ionosphere: Plasma Waves And Instabilities, Ionosphere: Wave/Particle Interactions, Ionosphere: Wave Propagation

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, using 7 and 4 years of digital data obtained at a conjugate pair of stations, Syowa in Antarctica and Husafell in Iceland. The emission intensity shows obvious quasi-periodic fluctuations, with periods of 1 day (maximum around noon), ~27 days, 1 year (minimum around local winter), and ~11 years (not yet confirmed but reasonably apparent in the 7 years of data). 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 ~27 days and ~11 years. It is suggested that sunlight in the ionosphere affects the propagation of waves whereas the solar activity (geomagnetic activity) affects their generation.

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