Solar brightness distribution at 8.6 mm from interferometer observations     

K. Kawabata  M. Fujishita  T. Kato  H. Ogawa  T. Omodaka 《Solar physics》1980,65(2):221-227

The radial brightness distribution of the quiet Sun at 8.6 mm is synthesized from observations using a sixteen element east-west interferometer in Nagoya. The observed brightness is flat from the disk center to 0.8R . A slight darkening appeared between 0.8R and the limb. No evidence of the bright ring near the limb is found. The radio radius at 8.6 mm is 1.015±0.005R . In addition there exists a coronal component just outside the radio limb.  相似文献   

Interferometer observations of a radio burst at 8.6 mm associated with a polarized hard X-ray event     

K. Kawabata  Y. Sofue  H. Ogawa  T. Omodaka 《Solar physics》1973,31(2):469-481

Observations of a radio burst at 8.6 mm wavelength on 1970 November 5, are described with the particular interest on the correspondence between radio and polarized X-ray events. The radio observations were carried out using an interferometer with a half power width of 2.9 at the Dept. of Physics, Nagoya University, and indicated that the location of the radio burst coincided with preceding sunspots and the size of the burst source must be very small, less than about 1. Mechanisms of radio and X-ray emissions are discussed briefly.  相似文献   

High-resolution observations of the Orion bright bar     

Omodaka  Toshihiro  Hayashi  Masahiko  Suzuki  Saeko  Hasegawa  Tetsuo  Miyawaki  Ryosuke 《Astrophysics and Space Science》1986,118(1-2):401-404

High resolution strip maps of CS (J=1–0) and H51 line emission across the Orion bright bar are presented. They reveal the existence of a high density molecular layer (molecular sheet) plane parallel to the ionization front. This molecular sheet is redshifted relative to the ambient molecular cloud by about 2 km s^–1. The rapid decrease of the CS emission at about 50 arc sec from the bar suggests that a shock front exists here and the sheet is a post shock layer.Paper presented at the IAU Third Asian-Pacific Regional Meeting, held in Kyoto, Japan, between 30 September–6 October, 1984.This work was carried out under the common use observation program at the Nobeyama Radio Observatory (NRO). NRO, a branch of the Tokyo Astronomical Observatory, University of Tokyo, Japan, is a cosmic radio observing facility open to outside users.  相似文献   

Rising motion of a behind-the-limb flare at 35 GHz     

Tatsuji Kato  Toshihiro Omodaka  Mitsumi Fujishita  Kin-Aki Kawabata  Hideo Ogawa 《Solar physics》1982,78(1):137-140

Interferometer observation of a behind-the-limb flare on 7 September, 1977, at 35 GHz ( = 8.6 mm) shows that the microwave non-thermal radio source of the burst is located in the coronal region at the height higher than 7000 km above the photosphere and rises gradually with the velocity of about 30 km s^-1.  相似文献