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

• Rastogi R. G.

  Department of Physics, Gujarat University Physical Research Laboratory

• Pathan B. M.

  Indian Institute of Geomagnetism

• Rao D. R. K.

  Indian Institute of Geomagnetism

• Sastry T. S.

  National Geophysical Research Institute

• Sastri J. H.

  Indian Institute of Astrophysics

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.<BR>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 and negative at higher latitude stations. However, sfe (Z) is negative at the equatorial latitudes. <BR>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 a positive impulse in H, increasing with increasing distance from the equator. These results are presented and discussed.

Journal

• Earth, Planets and Space

  Earth, Planets and Space 51 (9), 947-957, 1999

  Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences

Keywords

• Space and Planetary Science
• Geology

Details

• CRID: 1390282681486937728
• NII Article ID: 10002698437
• NII Article ID: 130003780755
• NII Book ID: AA11211921
• DOI: 10.1186/bf03351565
• ISSN: 18805981
• ISSN: 13438832
• NDL BIB ID: 4891137
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4891137
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03351565.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03351565/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03351565
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed