Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..644i&link_type=abstract
Nature (ISSN 0028-0836), vol. 318, Dec. 26, 1985, p. 644-646. Research supported by the Ministry of Education, Science and Cultu
Astronomy and Astrophysics
Astronomy
7
Interplanetary Dust, Optical Polarization, Solar Corona, Solar Eclipses, Astronomical Maps, Balloon-Borne Instruments, Solar Instruments, Television Cameras
Scientific paper
It is very difficult to make optical observations from the earth where the angular distance from the sun is greater than three angular solar radii, because of the large and uncertain correction for sky radiation. To overcome these difficulties, optical polarization observations have been made at four wavelengths (5330 A, 5970 A, 7200 A, and 8015 A) for the outer solar corona at an altitude of 30 km, using a balloon-borne silicon-intensified TV camera during the total solar eclipse on June 11, 1983 in Indonesia. A polarization excess at an elongation between four and five angular solar radii from the sun in the ecliptic plane was observed at a wavelength of 8015 A on the two-dimensional frame. This is interpreted as an enhancement of dust grains distributed in a ring around the sun approximately in the ecliptic plane.
Baba Naoshi
Hirayama Tadashi
Isobe Shuzo
Miura Naoya
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