Observations of a geomagnetic SI+ – SI− pair and associated solar wind fluctuations

We report a pair of oppositely directed sudden impulses (SI), in the geomagnetic field (ΔX), at ground stations, called SI+ – SI− pairs, that occurred between 1835 UT and 2300 UT on 23 April 1998. The SI+ – SI− pair, was well correlated with corresponding variations in the solar wind density, while...

Full description

Saved in:
Bibliographic Details
Published inProceedings of the International Astronomical Union Vol. 8; no. S294; pp. 543 - 544
Main Authors Bisoi, Susanta Kumar, Janardhan, P.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.08.2012
Subjects
Contributed Papers
Magnetic fields
Solar cycle
Solar flares
India
Sun: solar wind and Sun: magnetic fields
Interplanetary shocks
Online AccessGet full text

Cover

More Information
Summary:We report a pair of oppositely directed sudden impulses (SI), in the geomagnetic field (ΔX), at ground stations, called SI+ – SI− pairs, that occurred between 1835 UT and 2300 UT on 23 April 1998. The SI+ – SI− pair, was well correlated with corresponding variations in the solar wind density, while solar wind velocity and the southward component of the interplanetary magnetic field (Bz) did not show any correspondence. This event had no source on the visible solar disk but was associated with a rear-side fast partial halo coronal mass ejection (CME) and an optically occulted M1.4 class solar flare behind the west limb. This event was unique in that one could clearly identify variations in ΔX at ground stations with solar wind parameters.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921313003141