| Autor: |
Koyama, Kouichi, Ohara, Soji, Unno, Wasaburo |
| Jazyk: |
angličtina |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
理工学総合研究所研究報告 = Annual reports by Research Institute for Science and Technology. 6:69-73 |
| ISSN: |
0916-2054 |
| Popis: |
[Abstract] White-light movie images of quiet sun observed by Spacelab2 are studied by means of a simple personal image analyzing system(PIAS). A 2-dimensional spacial Fourier analysis is performed for scenes of more than 20 epochs in 25 minutes observing interval. Inverse Fourier transform images for several selected spatial frequency regions are then produced, and the brightness of a pixel on successive images is measured to obtain the time dependence of that spatial frequency. Preliminary measurements show peaks in the (k-ω)-spectram corresponding to spectral ranges of the evanescent wave in addition to the spectral ranges corresponding to the well-known solar 5 min oscillation. Since the present measurement is relatively sensitive to holizontal motion, the possible detection of the evanescent wave spectrum should not be disregarded, even if theoretically implausible. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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