Observations of the Mie scattered light intensities around the Sun with a portable coronagraph

Details Observations of the Mie scattered light intensities around the Sun with a portable coronagraph Observations of the Mie scattered light intensities around the Sun with a portable coronagraph

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rnaoj...6...11t&link_type=abstract

Report of the National Astronomical Observatory of Japan (ISSN 0915-6321), Vol. 6, No. 1, p. 11 - 21 (2002)

Astronomy and Astrophysics

Astronomy

Portable Coronagraphs, Solar Corona: Observations

Scientific paper

Measurements of Mie scattering intensites around the Sun have been carried out by using a 5 cm coronagraph at (1) Chichijima, Ogasawara Islands, (2) Shiiba, Miyazaki prefecture, (3) Kitadaito Island, Okinawa, (4) Hateruma Islands, Okinawa, and (5) Saku Island, Aichi prefecture. Although our observations were limited in time for only a few days, the results indicate that the solar corona may be observable even at an altitude of 1,000m or less (for example at Shiiba, Miyazaki) where the intensity of scattered light is eventually less than 100 μIo (here Io is the intensity of the solar disk center, and μIo means Io×10-6). Comparison among the tested sites is diffucult because the measurements were done in various seasons in the year; and monitoring over longer time period is necessary to derive definite conclusions. However, the sites where the scattered light intensity is stable and less than 100 μIo, could be a good site for the observations of the Sun considering the transparency of the sky.

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