𝔖 Bobbio Scriptorium
✦   LIBER   ✦

On the supposed anticorrelation of solar polar and equatorial rotation rates

✍ Scribed by Thomas L. Duvall; Leif Svalgaard

Publisher
Springer
Year
1978
Tongue
English
Weight
203 KB
Volume
56
Category
Article
ISSN
0038-0938

No coin nor oath required. For personal study only.

✦ Synopsis

Howard and Harvey (1970)

analyzed Mt. Wilson Doppler shifts to obtain a daily measure of the Sun's differential rotation. The data were fitted to give an angular velocity of the form oJ = a + b sin 2 B + c sin 4 B (B = heliographic latitude). Changes in a, b, c were found to be correlated (Howard and Harvey, 1970). Yoshimura (1972) used the anticorrelation of the b and c parameters to infer the existence of large-scale convection. Wolff (1975) used the b-c anticorrelation and a weak correlation between a and b to infer that variations of the Sun's polar and equatgrial rotation rates are anticorrelated. In this paper, the anticorrelation of b and c is shown to be due to numerical coupling.

πŸ“œ SIMILAR VOLUMES

An anticorrelation between polar and equ
An anticorrelation between polar and equatorial rotation of the solar photosphere
✍ Charles L. Wolff πŸ“‚ Article πŸ“… 1975 πŸ› Springer 🌐 English βš– 228 KB

Published spectroscopic measurements of solar rotation are analyzed to show that when the rotation velocity increases at high latitudes it tends to decrease at low latitudes, and conversely. The high latitude velocities typically vary over only 20 % of the range of those near the equator and the sma

New absolute spectroscopic measurement o
New absolute spectroscopic measurement of the solar equatorial rotation rate
✍ J. L. Snider πŸ“‚ Article πŸ“… 1983 πŸ› Springer 🌐 English βš– 544 KB

We have used an atomic-beam resonance-scattering technique applied to the 7699,~ solar potassium absorption line to make an absolute spectroscopic determination of the solar equatorial rotation rate. To our knowledge this is a new method which has not previously been used for studying solar rotation

On the latitude drift of sunspot groups
On the latitude drift of sunspot groups and solar rotation
✍ Jaakko Tuominen; Juhani KyrΓΆlΓ€inen πŸ“‚ Article πŸ“… 1982 πŸ› Springer 🌐 English βš– 620 KB

The N-S drift of sunspot groups has been studied in a different way than previously, using positions of recurrent groups of the years 1874-1976. The existence of the meridional motions, the general shape of the drift curves, and the dissimilarity between these curves around sunspot maxima and minima

On a difference of the chromospheric bac
On a difference of the chromospheric background intensity between the equatorial and polar regions of the sun
✍ C. J. Macris πŸ“‚ Article πŸ“… 1967 πŸ› Springer 🌐 English βš– 299 KB

Small chromospheric emission centres (here defined as floceuli) were studied photometrically on Kz.3,z spectroheliograms taken at the Arcetri Observatory. The intensity ratio between hi, the ftocculus brighteess, and Ionr, the brightness of the chromospheric background, was determined. A difference