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Multi-wavelength Observations of Solar Active Region NOAA 7154We report on observations of a solar active region in May 1992 by the Solar Plasma Diagnostic Experiment (SPDE) in coordination with the Yohkoh satellite (producing soft X-ray images) and ground-based observatories (producing photospheric magnetograms and various filtergrams including those at the CN 3883 A line). The main focus is a study of the physical conditions of hot (T is approximately greater than 3 MK) coronal loops at their foot-points. The coronal part of the loops is fuzzy but what appear to be their footpoints in the transition region down to the photosphere are compact. Despite the morphological similarities, the footpoint emission at 10(exp 5) K is not quantitatively correlated with that at approximately 300 km above the tau (sub 5000) = 1 level, suggesting that the heat transport and therefore magnetic field topology in the intermediate layer is complicated. High resolution imaging observations with continuous temperature coverage are crucially needed.
Document ID
Document Type
Reprint (Version printed in journal)
Bruner, M. E. (Lockheed Martin Corp. Palo Alto, CA United States)
Nitta, N. V. (Lockheed Martin Corp. Palo Alto, CA United States)
Frank. Z. A. (Lockheed Martin Corp. Palo Alto, CA United States)
Dame, L. (Centre National de la Recherche Scientifique Verrieres-Le Buisson, France)
Suematsu, Y. (National Astronomical Observatory Tokyo, Japan)
Date Acquired
August 20, 2013
Publication Date
August 9, 2000
Publication Information
Publication: Astronomy and Astrophysics
Subject Category
Solar Physics
Funding Number(s)
Distribution Limits