INTERPRETATION OF X-RAY PHOTOGRAPH OF THE SUN
Journal Article
·
· Astrophysical Journal (U.S.)
An x-ray picture of the sun was obtained on April 19, 1960, using pinhole-camera photography. Photometric analysis of the picture has shown that at least 75 per cent of the x radiation passed by the pinhole window material emanated from condensations in the lower corona localized above CaK plages. The x-ray plages'' appear to be of smaller dimension than the corresponding calcium plages. A strong correlation exists between the distribution of sources of x-ray emission and decimeter wave emission. When allowance is made for the transmission of the camera window material and the spectral sensitivity of the photographic film, it is estimated that the solar x-ray flux (060 A) at the earth was about 0.3 erg cm/sup -2/ sec/sup -1/ assuming a Planckian solar x-ray spectrum characterized by a temperature of 10/sup 6/ deg K. There is evidence for only a small amount of limb brightening in the non-plage background emission. The measured emission extended to about 43000 km beyond the optical limb. (auth)
- Research Organization:
- U.S. Naval Research Lab., Washington, D.C.
- NSA Number:
- NSA-17-015040
- OSTI ID:
- 4756604
- Journal Information:
- Astrophysical Journal (U.S.), Journal Name: Astrophysical Journal (U.S.) Vol. Vol: 137; ISSN ASJOA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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