Determining parameters of large-scale traveling ionospheric disturbances of auroral origin using GPS-arrays

Details Determining parameters of large-scale traveling ionospheric disturbances of auroral origin using GPS-arrays Determining parameters of large-scale traveling ionospheric disturbances of auroral origin using GPS-arrays

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..553a&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 7, p. 553-565.

Physics

25

Scientific paper

The intention in this paper is to investigate the form and dynamics of large-scale traveling ionospheric disturbances (LS TIDs) of auroral origin. We have devised a technique for determining LS TID parameters using GPS-arrays whose elements can be selected from a large set of GPS stations forming part of the International GPS Service network. The method was used to determine LS TID parameters during a strong magnetic storm of September 25, 1998. The North-American sector where many GPS stations are available, and also the time interval 00:00-06:00 UT characterized by a maximum value of the derivative Dst were used in the analysis. The study revealed that this period of time was concurrent with the formation of the main ionospheric trough with a conspicuous southward wall in the range of geographic latitudes 50-60° and the front width of no less than 7500 km. The auroral disturbance-induced large-scale solitary wave with a duration of about 1 h and the front width of at least 3700 km propagated in the equatorward direction to a distance of no less than 2000-3000 km with the mean velocity of about 300 m/s. The wave front behaved as if it `curled' to the west in longitude where the local time was around afternoon. Going toward the local nighttime, the propagation direction progressively approximated an equatorward direction.

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