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Solar flare effects on the geomagnetic elements during normal and counter electrojet periods

Abstract

The paper describes the study of solar flare effects (sfe) on horizontal (H), eastward (Y) and vertical (Z) components of the geomagnetic field at the Indo-USSR chain of magnetic observatories extending from the magnetic latitudes 0° to 45°N, a network not available any where else in the world. Events are selected when strong, normal and reversed (counter) equatorial electrojet are in existence as well as when only a partial counter electrojet is present.

During a strong and normal electrojet event time, sfe consists of a positive impulse in H at all stations, the amplitude of H following the latitudinal variation similar to that of the quiet day monthly mean, Sq (H). The sfe in Y is negative at all the stations. Sfe in Z shows positive impulse at the four-electrojet stations and negative at other stations. During a counter electrojet period the effect of solar flare on H field is negative impulse at electrojet stations, positive at low latitude and again negative at stations north of Sq focus. Sfe in Y is small at all the equatorial nd negative at higher latitude stations. However, sfe (Z) is negative at the equatorial latitudes.

During a partial counter electrojet period the observed effect is the combination of an increase of the planetary current component and the decrease of the electrojet component, giving rise to a negative impulse in H at equatorial stations and apositive impulse in H, increasing with increasing distance from the equator. These results are presented and discussed.

References

  • Carlo, L., B. P. Singh, R. G. Rastogi, and A. K. Agrarwal, The induced effects of geomagnetic variations in equatorial region, J. Geophys., 51, 199–205, 1982.

    Google Scholar 

  • Carrington, R. C., Description of a singular appearance seen in the sun on Sep 1, 1859, Mon. Notic. Roy. Astron. Soc., 20, 13, 1859.

    Article  Google Scholar 

  • Dellinger, J. H., A new radio transmission phenomenon, Phys. Rev., 48, 705, 1935.

    Article  Google Scholar 

  • Fleming, J. A., Notes on radio fade-out of August 25, 1936, Terr. Magn. Atmos. Electr., 41, 404–436, 1936.

    Article  Google Scholar 

  • Forbush, S. E. and M. Casaverde, Equatorial Electrojet in Peru, 135 pp., C.I.W. Publ. No. 620, Washington D.C., 1961.

  • Fukushima, N., Transequatorial field-aligned currents at low latitudes and their possible connection with the equatorial electrojet, Brazilian Journal of Geophys., 11, 291–302, 1993.

    Google Scholar 

  • Hodgson, R., On a curious appearance seen in the sun, Mon. Notic. Roy. Astron. Soc., 20, 15, 1859.

    Article  Google Scholar 

  • McNish, A. G., Terrestrial magnetic and ionospheric effects associated with bright chromospheric eruptions, Terr. Magn. Atmos. Electr., 42, 109–122, 1937.

    Article  Google Scholar 

  • Nagata, T., Characteristics of the solar flare effects (Sqa) on geomagnetic field at Huancayo (Peru) and at Kakioka (Japan), Terr. Magn. Atmos. Electr., 57, 1–14, 1952.

    Article  Google Scholar 

  • Nagata, T., Solarflare effectonthe geomagneticfield, J. Geomag. Geoelectr., 18, 197–219, 1966.

    Article  Google Scholar 

  • Nityananda, N., A. K. Agarwal, and B. P. Singh, Induction at short periods in the horizontal fieldvariations in the Indian Peninsula, Phys. Earth Planet. Inter., 15, 5–9, 1977.

    Article  Google Scholar 

  • Ohshio, M., N. Fukushima, and T. Nagata, Solar flare effects on geomagnetic field, Rep. Ionos. Space Res. Japan, 21, 77–114, 1967.

    Google Scholar 

  • Rajaram, M., B. P. Singh, N. Nityananda, and A. K. Agarwal, Effect of the presence of a conducting channel between India and Sri Lanka Island on the features of the equatorial electrojet, Geophys. J. R. Astr. Soc., 56, 127–138, 1979.

    Article  Google Scholar 

  • Raja Rao, K. S. and M. P. Rao, On the location of the ionospheric current system causing geomagnetic solar flare effects, J. Atmos. Sci., 20, 498–501, 1963.

    Article  Google Scholar 

  • Rangarajan, G. K. and R. G. Rastogi, Solar flare effect in equatorial magnetic field during morning counter electrojet, Ind. J. Rad. Space Phys., 10, 190–192, 1981.

    Google Scholar 

  • Rastogi, R. G., Solar flare crochet and sudden commencement in H within the equatorial electrojet region, J. Atmos. Terr. Phys., 27, 663–668, 1965.

    Article  Google Scholar 

  • Rastogi, R. G., On the simultaneous existence of eastward and westward flowing equatorial electrojet currents, Proc. Ind. Acad. Sci., A81, 80–92, 1975.

    Google Scholar 

  • Rastogi, R. G., Latitudinal extent of equatorial electrojet effects in Indian zone, Ann. Geophys., 9, 777–783, 1991.

    Google Scholar 

  • Rastogi, R. G., Solar flare effects on zonal and meridional currents at the equatorial electrojet stations Annamalainagar, J. Atmos. Terr. Phys., 58, 1413–1420, 1996.

    Article  Google Scholar 

  • Rastogi, R. G., Meridional equatorial electrojet current in American sector, Ann. Geophys., 17, 220–230, 1999.

    Article  Google Scholar 

  • Rastogi, R. G., M. R. Deshpande, and N. S. Sastri, Solar flare effect in equatorial counter electrojet current, Nature (London), 258, 218–219, 1975.

    Article  Google Scholar 

  • Rastogi, R. G., G. K. Rangarajan, A. Sen Gupta, K. N. Iyer, and G. D. Vyas, Solarflare of 6 Nov 1980 and associated ionospheric effects, Ind. J. Radio Space Phys., 13, 179–183, 1983.

    Google Scholar 

  • Rastogi, R. G., D. R. K. Rao, S. Alex, B. M. Pathan, and T. S. Sastry, An intense SFE and SC event in geomagnetic H, Y and Z fields at the Indian Observatories, Ann. Geophys., 15, 1301–1308, 1997.

    Article  Google Scholar 

  • Richardson, R. S., The bright hydrogen eruption and radio fade out of April 8, 1936, Terr. Magn. Atmos. Electr., 41, 197–198, 1936.

    Article  Google Scholar 

  • Richmond, A. D. and S. V. Venkateswaran, Geomagnetic crochets and associated ionospheric current systems, Radio Sci., 6(2), 139–164, 1971.

    Article  Google Scholar 

  • Sastri, J. H., The geomagnetic solar flare of 6 July 1968 and its implications, Ann. Geophys., 31, 481–485, 1975.

    Google Scholar 

  • Srivastava, B. J., The geomagnetic solar flare effect on the counter electrojet, J. Atmos. Terr. Phys., 36, 1571–1575, 1974.

    Article  Google Scholar 

  • Srivastava, B. J. and H. Abbas, An interpretation of the Induction arrows at Indian stations, J. Geomag. Geoelectr., 32 (Suppl), 187–196, 1978.

    Google Scholar 

  • Torreson, O. W., W. E. Scott, and H. E. Stanton, A conspicuous solar eruption on April 8, 1936 and simultaneous disturbances on magnetic, ionospheric and earth current records at Huancayo magnetic observatory, Terr. Magn. Atmos. Electr., 41, 199–201, 1936.

    Article  Google Scholar 

  • Van Saben, D., Ionospheric current systems of ten IGY solar flare effects, J. Atmos. Terr. Phys., 22, 32–42, 1961.

    Article  Google Scholar 

  • Veldkamp, J. and D. Van Saben, On the current system of solar flare effects, J. Atmos. Terr. Phys., 18, 192–202, 1960.

    Article  Google Scholar 

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Rastogi, R.G., Pathan, B.M., Rao, D.R.K. et al. Solar flare effects on the geomagnetic elements during normal and counter electrojet periods. Earth Planet Sp 51, 947–957 (1999). https://doi.org/10.1186/BF03351565

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