A better photograph of coronal streamers

Details A better photograph of coronal streamers A better photograph of coronal streamers

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978s%26t....56...92m&link_type=abstract

Sky and Telescope, vol. 56, Aug. 1978, p. 92-94. Research sponsored by the U.S. Department of Energy.

Computer Science

1

Coronagraphs, Image Enhancement, Solar Corona, Solar Eclipses, Density Distribution, Image Filters, Photographic Film, Polarized Light, Spatial Filtering

Scientific paper

Image enhancement techniques were applied to negatives taken from an aircraft at an altitude of 18,000 m of the 30 June 1973 total solar eclipse. Three of the four exposures (taken on 70 mm fine-grain Kodak Panatomic-X) were shot through polarizing filters, the fourth was taken without a filter. A density map showing enhanced coronal streamers in the equatorial region was fed into a computer, which formed a new array with a digital filter. The new image exhibited streamer detail from 1.5 to 9 solar radii. The image was further enhanced by spatial filtering, which suppressed slow gradations due to a dust background, and accentuated the sharp inhomogeneities due to the streamers. The final result, a combination of four completely filtered negatives, reveals streamer detail out to 12 solar radii.

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