Intensity ratio I(5577)/I(3914) in Type B red aurora
| Autor: | C. D. Anger, W. Sawchuk |
|---|---|
| Rok vydání: | 1976 |
| Předmět: |
Physics
Astronomy and Astrophysics Astrophysics Geophysics Intensity ratio Luminosity Particle acceleration enzymes and coenzymes (carbohydrates) Altitude Space and Planetary Science Sky brightness Homogeneous embryonic structures Light emission biological phenomena cell phenomena and immunity Surge |
| Zdroj: | Planetary and Space Science. 24:893-896 |
| ISSN: | 0032-0633 |
| Popis: | Ground-based observations of Type B aurora associated with a westward travelling surge indicate that decreases of up to 40% in the ratio of I(5577)/I(3914) occurred at the region of peak luminosity when compared to parts of the surge removed from the Type B aurora, and to a homogeneous arc at a similar elevation angle. Also, a sharper cutoff was observed for the 5577 A luminosity profile at the lower edge of the Type B aurora. Both effects imply increased quenching or decreased excitation of the 5577 A emission, consistent with a lower altitude for the Type B aurora. The diffuse glow equatorward of the surge showed only a slight decrease in ratio at the time of occurrence of the Type B aurora. The characteristics of Type B aurora are highly suggestive of a local mechanism for particle acceleration. |
| Databáze: | OpenAIRE |
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