Ionospheric effects of the gravity wave launched by the September 18, 1974, sudden commencement

Details Ionospheric effects of the gravity wave launched by the September 18, 1974, sudden commencement Ionospheric effects of the gravity wave launched by the September 18, 1974, sudden commencement

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..999r&link_type=abstract

Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 999-1009.

Physics

15

Gravity Waves, Ionospheric Electron Density, Ionospheric Ion Density, Sudden Storm Commencements, Traveling Ionospheric Disturbances, Arctic Regions, Auroral Electrojets, Diurnal Variations, Electron Energy, Incoherent Scatter Radar, Thermosphere, Wind Variations

Scientific paper

A sudden commencement of a geomagnetic storm occurred on September 18, 1974. Later, a traveling ionospheric disturbance was detected by the incoherent scatter radar at Millstone Hill, Massachusetts and Arecibo, Puerto Rico. Measurements of electron temperature vertical distribution, ion temperature, and electron density are given. Based on a time-dependent dynamic model of the thermosphere, characteristics of the thermospheric gravity wave are evaluated. It is assumed that the wave source consists of enhanced electric currents and particle heating over the polar cap region. The gravity wave which the impulsive heating generates is found to propagate toward the equator. The time-dependent characteristics of the ionosphere as the wave passes over both radar stations are calculated by adding neutral temperature and wind perturbations to quiet time variations in a model mid-latitude ionospheric F region. Good agreement between calculated and observed properties is found for a 2 x 10 to the 15th J total energy input occurring in a 3-hour period over an area similar in size to the polar cap.

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