During the totality on June 11,1983 in East Java, Indonesia, we made a near-infrared photometric observation of the solar corona using a stratospheric balloon which was successfully launched by a joint team of ISAS, Japan and LAPAN, Indonesia. The surface brightness distributions in four near-infrared bands : at 1.25,1.65,2.25 and 2.8μm, have been obtained in the outer coronal region roughly along the ecliptic plane. Polarization at 2.25μm cas also been obtained. Noticeable excess emissions superposed on the strong coronal back ground emission have been recorded in the scan profiles at 1.25 and 1.65μm at about 4 R. from the sun. From the observed spatial distribution, the excess component which can be attributed to the thermal rdcliation of large (∿100μm in radius) olivine-like particles appears to originate in a circumsolar dust ring approximately in the ecliptic plane.
インドネシア日食気球による太陽近傍のダスト雲の熱輻射と偏光の観測
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