Brightness distribution of the Sun at 8.6 mm wavelength
Journal Article
·
· Publ. Astron. Soc. Jap., v. 24, no. 4, pp. 469-481
OSTI ID:4324294
The brightness distribution of the quiet sun at wavelength lambda = 8.6mm is synthesized from off-meridian observations using a four element east- west interferometer with equal spacing of 273 lambda . The beam separation and the beam width of the interferometer are about 12.6 and 3 minutes of arc, respectively, at the meridian plane. The observed brightness distribution at 8.6mm is essentially flat from the disk center to 0.95R sub solar - In addition to the nearly uniform component over the optical disk there exists an excess component just outside the optical limb. The component outside the limb is in agreement with the coronal emissions at this wavelength. The physical condition of the spicules is discussed by comparing the present observational data with the plane-parallel models of the chromosphere by GINGERICH and DE JAGER (1968; BCA) and by VERNAZZA and NOYES (1972). The present data indicate that the electron temperature in the spicules is less than 6000K, which agrees with HIRAIYAMA'S (1971) value, 6000 to 8000K, but contradicts the value of 16000K derived by BECKERS (1968) from optical observations. (auth)
- Research Organization:
- Nagoya Univ., Japan
- NSA Number:
- NSA-29-021989
- OSTI ID:
- 4324294
- Journal Information:
- Publ. Astron. Soc. Jap., v. 24, no. 4, pp. 469-481, Journal Name: Publ. Astron. Soc. Jap., v. 24, no. 4, pp. 469-481; ISSN PASJA
- Country of Publication:
- Japan
- Language:
- English
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