ULF wave occurrence statistics in a high-latitude HF Doppler sounder

Details ULF wave occurrence statistics in a high-latitude HF Doppler sounder ULF wave occurrence statistics in a high-latitude HF Doppler sounder

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999angeo..17..749w&link_type=abstract

Annales Geophysicae, vol. 17, Issue 6, pp.749-758

Computer Science

Sound

4

Scientific paper

Ultra low frequency (ULF) wave activity in the high-latitude ionosphere has been observed by a high frequency (HF) Doppler sounder located at Tromsø, Norway (69.7°N, 19.2°E geographic coordinates). A statistical study of the occurrence of these waves has been undertaken from data collected between 1979 and 1984. The diurnal, seasonal, solar cycle and geomagnetic activity variations in occurrence have been investigated. The findings demonstrate that the ability of the sounder to detect ULF wave signatures maximises at the equinoxes and that there is a peak in occurrence in the morning sector. The occurrence rate is fairly insensitive to changes associated with the solar cycle but increases with the level of geomagnetic activity. As a result, it has been possible to characterise the way in which prevailing ionospheric and magnetospheric conditions affect such observations of ULF waves.

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