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Interplanetary magnetic-field variations and substorm activity.
- Publication Year :
- 1972
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1972.
-
Abstract
- A fine time-scale study of interplanetary magnetic field (IMF) variations and auroral-zone magnetograms during active and moderately active days show that the time delay between the southward turning of the IMF and the first sign of a negative magnetic bay is typically less than 15 min. During the moderately active period, 88% of all substorms were associated with southward interplanetary magnetic fields. Conversely, 80% of all large southward IMF events were associated with auroral-zone negative bays; during some events, however, magnetic bays could not be found, even by using high-latitude stations. It is concluded that the main mechanism for the triggering of magnetospheric substorms is the southward turning of the IMF.
- Subjects :
- Space Sciences
Subjects
Details
- Language :
- English
- Database :
- NASA Technical Reports
- Notes :
- NGL-05-003-017, , NSF GA-26582
- Publication Type :
- Report
- Accession number :
- edsnas.19720049308
- Document Type :
- Report