NDLI: Using polar coronal hole area measurements to determine the solar polar magnetic field reversal in solar cycle 24

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Using polar coronal hole area measurements to determine the solar polar magnetic field reversal in solar cycle 24

Content Provider	NASA Technical Reports Server (NTRS)
Author	Karna, N. Webber Sr., S. A. Hess Pesnell, W. D.
Copyright Year	2014
Description	An analysis of solar polar coronal hole (PCH) areas since the launch of the Solar Dynamics Observatory (SDO) shows how the polar regions have evolved during Solar Cycle 24. We present PCH areas from mid-2010 through 2013 using data from the Atmospheric Imager Assembly (AIA) and Helioseismic and Magnetic Imager (HMI) instruments onboard SDO. Our analysis shows that both the northern and southern PCH areas have decreased significantly in size since 2010. Linear fits to the areas derived from the magnetic-field properties indicate that, although the northern hemisphere went through polar-field reversal and reached solar-maximum conditions in mid-2012, the southern hemisphere had not reached solar-maximum conditions in the polar regions by the end of 2013. Our results show that solar-maximum conditions in each hemisphere, as measured by the area of the polar coronal holes and polar magnetic field, will be offset in time.
File Size	1470029
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20150007708
Archival Resource Key	ark:/13960/t7kq30w8w
Language	English
Publisher Date	2014-05-06
Access Restriction	Open
Subject Keyword	Observation Solar Cycle Magnetic Reversal Coronal Holes Solar Corona Magnetometers Northern Hemisphere Data Processing Spaceborne Telescopes Southern Hemisphere Solar Cycles Magnetic Signatures Magnetic Measurement Magnetic Disturbances Polarity X Ray Astronomy Solar Magnetic Field Ultraviolet Astronomy Polar Regions Solar Observatories Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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