The solar causes of major geomagnetic storms

1994 ◽  
Vol 12 (2/3) ◽  
pp. 113-120 ◽  
Author(s):  
S. Bravo ◽  
A. L. Rivera
Keyword(s):  
Solar Wind ◽  
Geomagnetic Storms ◽  
Sudden Commencement ◽  
Interplanetary Scintillation ◽  
Solar Wind Disturbances

Abstract. In this paper we reanalyse the set of ten major geomagnetic storms which occurred between August 1978 and December 1979. We relate them to the characteristics of the solar wind disturbances which caused them and the solar sources of such disturbances as tracked by means of interplanetary scintillation. It seems to us that the shock causing the sudden commencement and the plasma behind it with an important long-lasting Bz south component (Bz.

H-Cmes and Ii-Type Radio Bursts Related Intense Geomagnetic Storms in Relation With Interplanetary Magnetic Field and Solar Wind Disturbances

2012 ◽  
Vol 2 (10) ◽  
pp. 1-3 ◽  
Author(s):  
Praveen Kumar Gupta ◽  
◽  
Puspraj Singh Puspraj Singh ◽  
Puspraj Singh Puspraj Singh ◽  
P. K. Chamadia P. K. Chamadia
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Interplanetary Magnetic Field ◽  
Geomagnetic Storms ◽  
Radio Bursts ◽  
Solar Wind Disturbances

scholarly journals Seasonal variations in the occurrence of geomagnetic storms

1996 ◽  
Vol 14 (3) ◽  
pp. 286-289 ◽  
Author(s):  
John R. Taylor ◽  
Mark Lester ◽  
Timothy K. Yeoman
Keyword(s):  
Solar Wind ◽  
Seasonal Variations ◽  
Annual Variation ◽  
Geomagnetic Storms ◽  
Magnetic Activity ◽  
Magnetic Storms ◽  
Sudden Commencement ◽  
Sudden Commencements ◽  
Solar Wind Origin

Abstract. Seasonal variations in the onset of magnetic storms are investigated. For the purposes of this study storms have been defined as events in which Dst falls below –50 nT for at least four consecutive hours. The storms have been classified as either storm sudden commencements (SSCs; storms initiated by a sudden commencement) or as storm gradual commencements (SGCs; all other storms). It is found that the semi-annual variation of magnetic activity is reflected in the occurrence statistics of SGC events only, indicative that the solar wind origin is different for SSCs and SGCs. It is suggested that the heliospheric latitude model of seasonal magnetic activity is relatively ineffective in modulating the previously observed seasonal variations in the occurrence of magnetic storms.

On the interpretation of the sudden commencement of geomagnetic storms

1964 ◽  
Vol 69 (1) ◽  
pp. 139-155 ◽  
Author(s):  
E. J. Stegelmann ◽  
C. H. von Kenschitzki
Keyword(s):  
Geomagnetic Storms ◽  
Sudden Commencement

scholarly journals Study of Solar Wind and Interplanetary Magnetic Field Features Associated with Geomagnetic Storms: The Cross Wavelet Approach

2021 ◽  
Author(s):  
Sujan Prasad Gautam ◽  
Ashok Silwal ◽  
Prakash Poudel ◽  
Monika Karki ◽  
Binod Adhikari ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Interplanetary Magnetic Field ◽  
Geomagnetic Storms ◽  
The Cross ◽  
Cross Wavelet
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