NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Magnetic Roots and the Driving of Extended Coronal HeatingWe report results from a continuation of a previous study, in which we found large bright coronal loops within active regions and extending from active regions that have one end rooted near an island of included magnetic polarity that is a site of enhanced coronal heating and microflares. This suggested that magnetic activity such as microflaring results in enhanced heating in both the compact core field around the island and in the large loops extending from it. We might expect that the intensity variations due to enhanced heating in the compact and extended structures would be correlated. However, although some ex- tended loops do respond to the largest events taking place in the core fields near their feet, they do not show a clear response to most smaller individual events nor to the overall envelope of coronal heating activity in the core fields at their feet as determined from longer-term observations. Thus, while it is clear that the extended loops' heating is being driven from their ends at the magnetic islands, much of this heating is apparently by some form of footpoint activity that is not strongly coupled to the heating in the footpoint core fields. One possibility is that the remote heating in the extended loops is driven by reconnection at the magnetic null over the island, and that this reconnection is driven mainly by core-field activity that produces little coronal heating within the core field itself, perhaps in the manner of the numerical simulations by Karpen, Antiochos, and DeVore.
Document ID
19990018642
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Porter, Jason G.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Falconer, D. A.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Moore, Ronald L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Harvey, Karen L.
(Solar Physics Research Corp. Tucson, AZ United States)
Rabin, Douglas M.
(National Solar Observatory Tucson, AZ United States)
Shimizu, T.
(Tokyo Univ. Japan)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Subject Category
Solar Physics
Meeting Information
Meeting: Spring 1998 AGU Meeting
Location: Boston, MA
Country: United States
Start Date: May 26, 1998
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available