Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.169s&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
We present a statistical study of the Coronal Mass Ejections (CMEs) position angle (PA) which permit us to determine their source region. By determining the functional form of the PA distribution, and assuming a radial movement of the CME center of mass, we are able to construct a random set of CME direction vectors (DV) with the following restriction: The distribution of the DVs projections in the plane of the sky should be equal to the observed PA distribution. We use the synthetic DV to study the relation between the CME source region and the overall photospheric magnetic field. We found that in general CME source regions are situated between high magnetic field regions, and not necessarily are associated to one of such regions. As instance, during the minimum and ascending phase of the cycle, CME source region are confined to the equatorial plane (lat = 0˚), between the two active region belts (lat = 40˚). We conclude from this study that CME sources are in general, high altitude magnetic loops, more precisely, trans-equatorial loops during the minimum and ascending phase of the cycle.
Caballero Rafael
Sanchez Arthur L.
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