New technique for measuring solar rotation
Journal Article
·
· Astrophys. J.; (United States)
A new technique for measuring solar photospheric and subphotospheric rotation rates is described. The technique utilizes the standing-wave nature of the nonradial p-mode oscillations of the whole Sun. Specifically, the technique is based upon the observed concentration of p-mode oscillatory power into well defined ridges in two-dimensional wavenumber-frequency (K/sub h/, ..omega..) power spectra. The frequencies of the ridges in the eastward- and westward-traveling portions of an individual spectrum are systematically shifted in opposite directions by a drift of the standing-wave pattern across the observing field of view. The magnitudes of these frequency shifts are related to the drift velocity and to the horizontal wavenumber as follows: vertical-bar..delta omega..vertical-bar=vertical-bar..nu..vertical-barK/sub h/. Thus, measurement of the observed frequency shifts in a spectrum yields the drift velocity field at disk center, the observed drift velocity obtained in this way is exactly the rotational velocity of the solar p-mode pattern, and of the solar gas itself.
- Research Organization:
- George W. Downs Laboratory of Physics, California Institute of Technology
- OSTI ID:
- 6271708
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 227:2; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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