Electron-Temperature Maps of the Low Solar Corona: ISCORE Results from the Total Solar Eclipse of 29 March 2006 in Libya

We conducted an experiment in conjunction with the total solar eclipse of 29 March 2006 in Libya that measured the coronal intensity through two filters centered at 3850 Å and 4100 Å with bandwidths of ≈ 40 Å. The purpose of these measurements was to obtain the intensity ratio through these two filt...

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Bibliographic Details
Published in:Solar physics 2009-12, Vol.260 (2), p.347-361
Main Authors: Reginald, Nelson L., St. Cyr, O. C., Davila, Joseph M., Rabin, Douglas M., Guhathakurta, Madhulika, Hassler, Donald M.
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Corona
Filters
Physics
Physics and Astronomy
Solar eclipses
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Spectrum analysis
Sun
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Summary:We conducted an experiment in conjunction with the total solar eclipse of 29 March 2006 in Libya that measured the coronal intensity through two filters centered at 3850 Å and 4100 Å with bandwidths of ≈ 40 Å. The purpose of these measurements was to obtain the intensity ratio through these two filters to determine the electron temperature. The instrument, Imaging Spectrograph of Coronal Electrons (ISCORE), consisted of an eight inch, f/10 Schmidt Cassegrain telescope with a thermoelectrically-cooled CCD camera at the focal plane. Results show electron temperatures of 10 5  K close to the limb to 3×10 6  K at 1.3 R ⊙ . We describe this novel technique, and we compare our results to other relevant measurements. This technique could be easily implemented on a space-based platform using a coronagraph to produce global maps of the electron temperature of the solar corona.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-009-9457-z