Simultaneous radio and optical observations of the mid-latitude atmospheric response to a major geomagnetic storm of 6-8 April 2000

Details Simultaneous radio and optical observations of the mid-latitude atmospheric response to a major geomagnetic storm of 6-8 April 2000 Simultaneous radio and optical observations of the mid-latitude atmospheric response to a major geomagnetic storm of 6-8 April 2000

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1943a&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 18, p. 1943-1955.

Physics

9

Scientific paper

Basic properties of the mid-latitude traveling ionospheric disturbances (TIDs) during the maximum phase of a major magnetic storm of 6-8 April 2000 are shown. Total electron content (TEC) variations were studied by using data from GPS receivers located in Russia and Central Asia. The nightglow response to this storm at mesopause and termospheric altitudes was also measured by optical instruments FENIX located at the observatory of the Institute of Solar-Terrestrial Physics /(51.9°N,103.0°E), and MORTI located at the observatory of the Institute of Ionosphere (43.2°N,77.0°E). Observations of the O (557.7and630.0nm) emissions originating from atmospheric layers centered at altitudes of 90 and 250km were carried out at Irkutsk and of the O2(b1∑g+- X3∑g-) (0-1) emission originating from an atmospheric layer centered at altitude of 94km was carried out at Almaty. Our radio and optical measurement network observed a storm-induced solitary large-scale wave with duration of 1h and a wave front width of no less than 5000km, while it traveled equatorward with a velocity of 200m/s from /62°N to /38°N geographic latitude. The TEC disturbance, basically displaying an electron content depression in the maximum of the F2 region, reveals a good correlation with growing nightglow emission, the temporal shift between the TEC and emission variation maxima being different for different altitudes. A comparison of the auroral oval parameters with dynamic spectra of TEC variations and optical 630nm emissions in the frequency range 0.4-4mHz (250-2500s periods) showed that as the auroral oval expands into mid-latitudes, also does the region with a developed medium-sale and small-scale TEC structure.

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