NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The dynamic quiet solar corona: 4 days of joint observing with MDI and EITThe analysis of a sequence of joint extreme ultraviolet imaging telescope (EIT) Fe XII and Michelson Doppler imager (MDI) magnetogram observations of the quiet sun near disk center is presented. It was found that: all the emerging flux above the threshold of approximately 10(sup 17) Mx is associated with enhanced coronal emissions; loop systems between the polarities in ephemeral regions remain visible up to separations of 10000 up to 30000 km; brightenings between approaching opposite polarity network concentrations form when the concentrations are between 5000 and 25000 km apart, and that faint connections up to 40000 km in length form as sets of concentrations of the same polarity coagulate. The coronal emission over patches of the quiet sun depends on the total flux in connected concentrations, on their distance and on the positions and strengths of neighboring concentrations.
Document ID
19990028142
Document Type
Conference Paper
Authors
Schrijver, C. J. (Lockheed Martin Palo Alto Research Lab. Palo Alto, CA United States)
Shine, R. A. (Lockheed Martin Palo Alto Research Lab. Palo Alto, CA United States)
Hurlburt, N. E. (Lockheed Martin Palo Alto Research Lab. Palo Alto, CA United States)
Tarbell, T. D. (Lockheed Martin Palo Alto Research Lab. Palo Alto, CA United States)
Lemen, J. R. (Lockheed Martin Palo Alto Research Lab. Palo Alto, CA United States)
Date Acquired
August 19, 2013
Publication Date
September 1, 1997
Subject Category
Solar Physics
Funding Number(s)
CONTRACT_GRANT: NAG5-3077
CONTRACT_GRANT: NAS5-32966
Distribution Limits
Public
Copyright
Other
Document Inquiry