On latitude dependence of geomagnetic strom after-effects in ionospheric absorption

Chukwuma, V. U. (2001) On latitude dependence of geomagnetic strom after-effects in ionospheric absorption. Acta Geodaetica et Geophysica Hungarica, 36 (3). pp. 261-267. ISSN 1217-8977

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Abstract

HF absorption enhancements following major geomagnetic storms are analysed, using the superposed epoch method, to examine the geomagnetic latitude limit of the after-effect phenomenon. The absorption data were obtained from one double hop and two single hop A3 transmission paths with ionospheric points at F geomag = 3:54oN and ~6. 40oN (15. 40 MHz), F geomag ~ 9N (4. 87 MHz), and F geomag ~ 11oN (6. 09 MHz) respectively. Presently, the results have shown that enhancement in absorption following major storms could be traced to the low latitude of 3. 54oN.

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