Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..99b&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
pht08bdu@rediffmail.com Space-borne and earth-based detectors are monitoring coronal mass ejections (CMEs) launched from the sun into the heliosphere. A subset of CMEs, called interplanetary magnetic clouds (IMCs), shows systematic rotation (northward to southward and vice versa) in their field structures. The IMCs have been identified in the heliospheric plasma and field data. These IMCs, observed at 1 AU, have been observed to show different dynamical properties. Some of them are, (a) isolated structures moving with the ambient solar wind, (b) faster moving IMCs drive a shock/sheath region formed due to compression of the ambient plasma/field ahead of them, and (c) a fraction of IMCs are driven by fast solar wind from coronal holes forming interaction region (IR) between IMCs and high speed solar wind streams (HSS). The interaction of the solar wind and the earth’s magnetosphere is complex and phenomenology of interaction is believed to be very different for solar wind dominated by transient ejecta (e.g. IMCs) compared to solar wind dominated by interaction regions and high speed streams from open field regions of coronal holes. Using different sets of IMCs, we have done a detailed study of their interaction with the magnetosphere and the geoeffectiveness of IMCs and their associated features (shock/sheath, IR and HSS). We have further studied the geoeffectiveness of northward to southward turning and southward to northward turning IMCs along with their associated features. To study the mechanism that produces the geomagnetic disturbances, we have further utilized the heliospheric plasma and field parameters namely, velocity, density, temperature, field strength and its north-south component, during the passage of these structures with different plasma/field properties. Noticeable differences in the geoeffectiveness of IMCs with different structural and dynamical properties have been observed. Correlation analysis between geomagnetic parameters and various heliospheric plasma/field parameters during passage of structures with different properties in done in order to identify the parameters playing important role, and their relative importance, in creating geomagnetic disturbances during their passage.
Badruddin A.
Pal Singh Yatendra
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