Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..629r&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 629-637.
Astronomy and Astrophysics
Astrophysics
15
Angular Velocity, Astrometry, Photosphere, Solar Rotation, Frequency Shift, Oscillations, Power Spectra, Standing Waves
Scientific paper
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 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 in such a way that measurement of the observed frequency shifts in a spectrum yields the drift velocity for that observing run. By guiding on the solar limbs and observing the 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.
Deubner Franz-Ludwig
Rhodes Elmer J.
Ulrich Richard K.
No associations
LandOfFree
A new technique for measuring solar rotation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A new technique for measuring solar rotation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new technique for measuring solar rotation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1141365