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Coronal Mass Ejection deflection in the corona during the two last solar minima

Published online by Cambridge University Press:  05 July 2012

Fernando Marcelo López ,
Hebe Cremades  and
Laura Balmaceda
Fernando Marcelo López
Affiliation:
Universidad Nacional de San Juan - FCEFyNAv. Ignacio de la Roza 590 (O), J5402DCS, San Juan, Argentina email: [email protected]
Hebe Cremades
Affiliation:
UTN - Facultad Regional Mendoza/CONICETRodriguez 243, Ciudad, Mendoza M5502AJE, Argentina email: [email protected]
Laura Balmaceda
Affiliation:
Instituto de Ciencias Astronómicas, de la Tierra y el Espacio/CONICETAv. España Sur 1512, J5402DSP, San Juan, Argentina email: [email protected]
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Abstract

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In the framework of the IAU Working Group on Comparative Solar Minima, we investigate the latitudinal deflection of Coronal Mass Ejections (CMEs) with respect to the location of their uniquely identified solar source regions. Data compiled during the Whole Sun Month (WSM) and Whole Heliosphere Interval (WHI) campaigns allowed for comparisons between the two last solar minima.

The analysis of the coronal streamers’ distribution during these intervals led to study of the dependence of CME deflection on the angular separation between their source regions and the nearest streamer. All performed analyses consider exclusively projected structures on the plane of the sky, disregarding longitudinal deflections as well.

The results of the present study indicate that for both minima most of the events (62.5% for WSM, 84.2% for WHI) are deflected towards the nearest streamer, following the boundary conditions imposed by the heliospheric current sheet.

Most of the deflections found in the WHI period could be explained by the more complex structure in the global distribution of magnetic field present during that minimum. On the other hand, the low number of events detected during the WSM period hinders the statistical comparison between both campaigns.

Keywords

Sun: coronaSun: coronal mass ejections (CMEs)Sun: activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 225 - 228
Copyright
Copyright © International Astronomical Union 2012

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