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IONOSPHERIC EFFECTS ASSOCIATED WITH GEOMAGNETIC AND SOLAR ACTIVITY DURING SUNDIAL IN SEPTEMBER-OCTOBER 1989

V.I.KurkinO.M.PirogN.M.PolekhV.D.UrbanovichG.A.Zherebtsov

Institute of Solar-Terrestrial Physics,Irkutsk.664033,P.O.Box 4026,Russia.

摘要:<正>We present the investigations of ionospheric disturbances as made during the SUNDIAL Campaign from September 8 to October 8,1989,based on data from Russia’s ionospheric stations.That period was characterised by disturbed geomagnetic conditions and high solar activity.Dst-variations,and data from ionosondes,magnetometers and riometers were used.Ne(h)-profiles were calculated for some disturbed time intervals. By analysing ionosphric parameters, it was possible to identify the following patterns in their behaviour. During world storms the F-region electron density decreases more than twice and maintains low values during 24 hours.This applies for both high- and midlatitude stations and is attributed to a rapid equatorward movement of the main ionospheric trough and to the decay of its equatorward wall.A proton flare caused the polar cap absorption (PCA) event which was observed at 30- hour intervals at the Norilsk latitude.At lower latitudes,the proton flare manifested itself as an increase in minimum reflection frequencies.
会议名称:

1997 International Symposium on Radio Propagation(ISRP’97)

会议时间:

1997-08-12

会议地点:

中国山东青岛

  • 专辑:

    基础科学

  • 专题:

    地球物理学

  • 分类号:

    P353

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