Dependence of ionospheric response on the local time of sudden commencement and the intensity of geomagnetic storms

Details Dependence of ionospheric response on the local time of sudden commencement and the intensity of geomagnetic storms Dependence of ionospheric response on the local time of sudden commencement and the intensity of geomagnetic storms

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..269b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, April 1990, p. 269-275.

Physics

16

Ionospheric Electron Density, Magnetic Storms, Sudden Ionospheric Disturbances, Sudden Storm Commencements, Midlatitude Atmosphere, Time Response

Scientific paper

A study has been designed specifically to investigate the dependence of the ionospheric response on the time of occurrence of sudden commencement (SC) and the intensity of the magnetic storms for a low- and a mid-latitude station by considering total electron content and peak electron density data for more than 60 SC-type geomagnetic storms. The nature of the response, whether positive or negative, is found to be determined largely by the local time of SC, although there is a local time shift of about six hours between low- and mid-latitudes. The time delays associated with the positive responses are low for daytime SCs and high for nighttime SCs, whereas the opposite applies for negative responses. The time delays are significantly shorter for mid-latitudes than for low-latitudes and, at both latitudes, are inversely related to the intensity of the storm. There is a positive correlation between the intensity of the ionospheric response and that of the magnetic storm, the correlation being greater at mid-latitudes. The results are discussed in the light of the possible processes which might contribute to the storm-associated ionospheric variations.

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