angeo-17-749-1999.pdf (343.64 kB)
ULF wave occurrence statistics in a high-latitude HF Doppler sounder
journal contribution
posted on 2012-10-24, 09:05 authored by D. M. Wright, T. K. Yeoman, T. B. JonesUltra 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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ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES, 1999, 17 (6), pp. 749-758Published in
ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCESPublisher
SPRINGER VERLAGissn
0992-7689Copyright date
1999Available date
2012-10-24Publisher DOI
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http://www.ann-geophys.net/17/749/1999/angeo-17-749-1999.htmlLanguage
EnglishAdministrator link
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Science & TechnologyPhysical SciencesAstronomy & AstrophysicsGeosciencesMultidisciplinaryMeteorology & Atmospheric SciencesGeologyionosphere (auroral ionosphere; ionosphere magnetosphere interactions)magnetospheric physics (MHD waves and instabilities)AURORAL BACKSCATTER EXPERIMENTFIELD-LINE RESONANCESGEOSTATIONARY ORBITHYDROMAGNETIC-WAVESPULSATIONSOSCILLATIONSRADARRANGEMAGNETOSPHERESTARE
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