Near-infrared emission-line and continuum observations from the 1991 eclipse

Details Near-infrared emission-line and continuum observations from the 1991 eclipse Near-infrared emission-line and continuum observations from the 1991 eclipse

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436..368p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-367X), vol. 436, no. 1, p. 368-371

Astronomy and Astrophysics

Astrophysics

6

Continuums, Emission Spectra, Infrared Spectra, Solar Atmosphere, Solar Corona, Solar Eclipses, Solar Flux, Sun, Astronomical Observatories, Charge Coupled Devices, Solar Temperature, Telescopes

Scientific paper

We report observations made during the 1991 July 11 total solar eclipse from the University of Hawaii 61 cm south telescope on the summit of Mauna Kea, Hawaii. The eclipse observations entail CCD imaging of a coronal region on the southeast limb of the Sun using four wavelength channels isolated with narrowband interference filters. We obtain two long exposure images in each channel including the continuum (lambda = 10690 A), the two near-infrared (Fe XIII) emission lines (lambda = 10747, 10798 A), and the He I line (lambda = 10830 A). We calibrate the images to the center-of-disk solar intensity. The (Fe XIII) images are the first coronal images published from these emission lines. We find significant structural differences between the line and continuum images implying large temperature gradients in our small field of view. We compute the line ratio of the two (Fe XIII) emission lines (R) and find that the ratio is within the limits 1.2 greater than or = R greater than or = 15.0. We examine the motion seen in the prominence structure and find transverse velocities of up to about 30 km/s. Finally we see no cold coronal emission to a limit of 2 x 10-7 solar BETA.

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