A breathing source surface for cycles 23 and 24

Arden, W. M. and Norton, A. A. and Sun, X. (2014) A breathing source surface for cycles 23 and 24. Journal of Geophysical Research: Space Physics , 119 (3). pp. 1476-1485. ISSN 2169-9380

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The potential field source surface (PFSS) model is used to represent the large-scale geometry of the solar coronal magnetic fields. The height of the source surface in this model can be taken as a free parameter. Previous work suggests that varying the source surface height during periods of solar minimum yields better agreement between PFSS models and the measured magnitude of the interplanetary magnetic field (IMF) open flux at 1 AU - in other words, the source surface breathes in and out over the course of the solar cycle. We examine the evolution of open flux during all of cycle 23 and the first part of cycle 24 using photospheric magnetic field maps from the Solar and Heliospheric Observatory's Michelson Doppler Imager and Solar Dynamics Observatory's Helioseismic and Magnetic Imager instruments. We determine the value of source surface height that provides a best fit to the IMF open flux at 1 AU (using the OMNI 2 data set) for the time period 1996-2012. The canonical 2.5 Rs source surface matches the measured IMF open flux during periods of solar maximum but needs to be raised by approximately 15-30% in order to match the measured IMF open flux at the periods of solar minimum.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 American Geophysical Union.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 13 May 2015 01:52
Last Modified: 01 Jun 2015 05:44
Uncontrolled Keywords: corona; cycle 23 minimum; PFSS; solar physics
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020107 Mesospheric, Ionospheric and Magnetospheric Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1002/2013JA019464
URI: http://eprints.usq.edu.au/id/eprint/27225

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