Polar crown filaments and solar differential rotation at high latitudes

1990 ◽  
pp. 293-293 ◽  
Author(s):  
R. Brajša ◽  
B. Vršnak ◽  
V. Rundjak ◽  
A. Schroll
Keyword(s):  
Differential Rotation ◽  
High Latitudes ◽  
Solar Differential Rotation

A model of solar differential rotation

Solar Physics ◽  
1991 ◽  
Vol 133 (2) ◽  
pp. 177-194
Author(s):  
L. L. Kichatinov
Keyword(s):  
Differential Rotation ◽  
Solar Differential Rotation

scholarly journals Measurements of Solar Differential Rotation Using the Century Long Kodaikanal Sunspot Data

Solar Physics ◽  
2021 ◽  
Vol 296 (1) ◽  
Author(s):  
Bibhuti Kumar Jha ◽  
Aditya Priyadarshi ◽  
Sudip Mandal ◽  
Subhamoy Chatterjee ◽  
Dipankar Banerjee
Keyword(s):  
Differential Rotation ◽  
Solar Differential Rotation ◽  
Sunspot Data

CCD-Doppler measurements of solar differential rotation

Solar Physics ◽  
1996 ◽  
Vol 167 (1-2) ◽  
pp. 441-444 ◽  
Author(s):  
Axel D. Wittmann
Keyword(s):  
Differential Rotation ◽  
Solar Differential Rotation

scholarly journals Long-Term Variations of Solar Differential Rotation and Sunspot Activity: Revisited

Solar Physics ◽  
2013 ◽  
Vol 289 (3) ◽  
pp. 759-768 ◽  
Author(s):  
K. J. Li ◽  
W. Feng ◽  
X. J. Shi ◽  
J. L. Xie ◽  
P. X. Gao ◽  
...  
Keyword(s):  
Differential Rotation ◽  
Sunspot Activity ◽  
Solar Differential Rotation ◽  
Long Term Variations

scholarly journals V. Sunspots

1985 ◽  
Vol 19 (1) ◽  
pp. 71-78
Author(s):  
V. Buraba
Keyword(s):  
Magnetic Fields ◽  
Differential Rotation ◽  
Solar Physics ◽  
Solar Constant ◽  
Dwarf Stars ◽  
Solar Differential Rotation ◽  
Scientific Meetings ◽  
Red Dwarf Stars ◽  
Stellar Magnetic Fields

Several proceedings of scientific meetings on sunspots appeared during the 1981-1984 period [The Physics of Sunsots, Cram and Thomas (eds.) 1981; see also reports of regional meetings, e.g.. Third European Solar Meeting, Oxford 1981; Nordic Astronomy Meeting, O. Hauge (ed.), Oslo 1983; 11th Regional Consultation on Solar Physics, L. Dezsö and B. Kalman (eds.), Debrecen 1983]. New interest in sunspots was aroused through observations of EUV sunspot spectra from space and was also inspired by the growing number of observations of starspots and other stellar activities [IAU Symposium No. 102, Solar and Stellar Magnetic Fields: Origin and Coronal Effects, J.O. Stenflo (ed.) 1983; Colloquium IAU No. 71 Activity in Red Dwarf Stars, Catania 1982]. Other reasons for the increased interest in sunspots and their energetics were prompted by the correlation between sunspot occurrence and the variations of the solar constant (Hudson et al. 1982) and by the use of sunspot positions for determining solar differential rotation and its change with latitude, depth, and time (Howard et al. 1984, Godoli S Mazzucconi 1982, Balthasar et al. 1984, Tuominen & Kyrolainen 1982, Adam 1983, Koch 1984).

scholarly journals Differential Rotation as an Axisymmetric Resonant Mode of Convection

1991 ◽  
Vol 130 ◽  
pp. 178-181
Author(s):  
Kwing L. Chan ◽  
Hans G. Mayr
Keyword(s):  
Angular Velocity ◽  
Differential Rotation ◽  
Rotation Axis ◽  
Numerical Models ◽  
Resonant Mode ◽  
Analytical Models ◽  
Resonance Model ◽  
Solar Convection Zone ◽  
Solar Differential Rotation ◽  
Solar Convection

Recent results from helioseismology (see Goode, these Proceedings) have shown that the inferred contours of the solar angular velocity are more or less radial in the convection region, and the rotation becomes uniform below. These observations contradict the prevailing numerical models of Taylor columns which predict angular velocity contours parallel to the rotation axis of the Sun. Thus, an alternative explanation of solar differential rotation is called for.Presently, it is not feasible to construct a thermally-relaxed, dynamically self-consistent numerical model of the solar convection zone (see Chan and Serizawa, these Proceedings). It is then appropriate to explore simplified models that may shed some light. A number of analytical models have been proposed for the solar differential rotation, and the reader is referred to the book by Rüdiger (1989) for a comprehensive review of this subject. Here, we report on some recent development on the convective resonance model proposed by Chan et al. (1987; hereafter referred as CSM).

Solar differential rotation determined by polar crown filaments

Solar Physics ◽  
1991 ◽  
Vol 133 (2) ◽  
pp. 195-203 ◽  
Author(s):  
R. Brajša ◽  
B. Vršnak ◽  
V. Ruždjak ◽  
A. Schroll ◽  
S. Pohjolainen ◽  
...  
Keyword(s):  
Differential Rotation ◽  
Solar Differential Rotation

scholarly journals Magnetic Activity of Two Similar Subgiants in Binaries with Very Different Mass Ratios: EI Eri and V711 Tau

2011 ◽  
Vol 7 (S282) ◽  
pp. 478-479 ◽  
Author(s):  
Katalin Oláh ◽  
Zsolt Kővári ◽  
Krisztián Vida ◽  
Klaus G. Strassmeier
Keyword(s):  
Differential Rotation ◽  
Activity Patterns ◽  
Magnetic Activity ◽  
Light Curves ◽  
Physical Parameters ◽  
Remarkable Difference ◽  
High Latitudes ◽  
Solar Type ◽  
Low Mass ◽  
Fast Rotating

AbstractWe use more than three decades-long photometry to study the activity patterns on the two fast-rotating subgiant components in EI Eri (G5IV) and V711 Tau (K1IV). From yearly mean rotational periods from the light curves, we find that EI Eri, with well-measured solar-type differential rotation, always has spots from the equator to high latitudes. The measured differential rotation of V711 Tau is controversial, and in any case is very small. The spots on the K1IV star in V711 Tau seem to be tidally locked. The physical parameters of the two systems are similar, with one remarkable difference: EI Eri has a low mass M4-5 dwarf companion, whereas V711 Tau has a G5V star in the system, thus their mass centers are in very different positions. This may modify the whole internal structure of the active stars, causing marked differences in their surface features.

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