Geomagnetic activity at the time of heliospheric current sheet crossings
- 1 September 1980
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 7 (9) , 653-656
- https://doi.org/10.1029/gl007i009p00653
Abstract
Geomagnetic activity during three days before and after heliospheric current sheet crossings is examined. It is shown that the expression for the index , obtained by Murayama [1979], is applicable to such geomagnetic activity, where (in nT) and V (in km/sec) stand for the southward component of the interplanetary magnetic field and solar wind bulk velocity, respectively. The effects of and V on AL are also examined separately. It is found that short term (∼hours) variations of AL are controlled by fluctuations of while long term (∼days) variations of AL are controlled by V.Keywords
This publication has 19 references indexed in Scilit:
- A study of geomagnetic stormsGeophysical Journal International, 1978
- Structure of the extended solar magnetic field and the sunspot cycle variation in cosmic ray intensityNature, 1976
- Interplanetary field effect on the magnetosphereSpace Science Reviews, 1975
- Effects of solar wind parameters on the development of magnetospheric substormsPlanetary and Space Science, 1975
- Observations of interactions between interplanetary and geomagnetic fieldsReviews of Geophysics, 1974
- Interplanetary sector structure and the helliomagnetic equatorAstrophysics and Space Science, 1973
- The interplanetary medium and its interaction with the Earth's magnetosphereSpace Science Reviews, 1971
- Interplanetary sector structure near the maximum of the sunspot cycleJournal of Geophysical Research, 1970
- Interplanetary sector structure in the rising portion of the sunspot cycleJournal of Geophysical Research, 1969
- The interplanetary magnetic field. Solar origin and terrestrial effectsSpace Science Reviews, 1968