The solar-flare infrared continuum: Observational techniques and upper limits |
| |
| Authors: | H S Hudson |
| |
| Institution: | (1) Dept. of Physics, University of California, 92037 San Diego, La Jolla, Calif., USA |
| |
| Abstract: | Exploratory observations at 20  and 350 have determined detection thresholds for solar flares in these wavelengths. In the 20 range solar atmospheric fluctuations (the  temperature field ) set the basic limits on flare detectability at  5K; at 350 the extinction in the Earth's atmosphere provides the basic limitation of 30K. These thresholds are low enough for the successful detection of several infrared-emitting components of large flares. Limited observing time and lack of solar activity have prevented observations of large flares up to the present, but the techniques promise to be extremely useful in the future.The upper limits obtained thus far, for subflares, indicate that the thickness of the H flare region does not exceed 10 km. This result confirms the conclusion of Suemoto and Hiei (1959) regarding the small effective thickness of the H-emitting regions in solar flares. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
