scholarly journals Consequences of high effective Prandtl number on solar differential rotation and convective velocity

2018 ◽  
Vol 30 (4) ◽  
pp. 046602 ◽  
Author(s):  
Bidya Binay Karak ◽  
Mark Miesch ◽  
Yuto Bekki
Keyword(s):  
Prandtl Number ◽  
Differential Rotation ◽  
Convective Velocity ◽  
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 A New Convective Velocity Scale for Studying Diurnal Urban Heat Island Circulation

2016 ◽  
Vol 55 (10) ◽  
pp. 2151-2164 ◽  
Author(s):  
Yifan Fan ◽  
Yuguo Li ◽  
Xiaoxue Wang ◽  
Franco Catalano
Keyword(s):  
Prandtl Number ◽  
Urban Heat Island ◽  
Field Measurements ◽  
Small Scale ◽  
Water Tank ◽  
Heat Island ◽  
Convective Velocity ◽  
Velocity Scale ◽  
Urban Heat ◽  
Urban Heat Island Circulation

AbstractUrban heat island circulation establishes an urban dome under stable stratification and no background wind conditions. Small-scale water models have been a very useful tool in the exploration of the mechanisms by which urban domes and their associated wind flows are formed. Data are available from a number of water-tank heat island models. Data from field measurements, computational fluid dynamics, and small-scale water-tank experiments are compared in this paper. The small-scale water-tank experiments were found to produce relatively low radial velocities, such as the radial horizontal velocity. Different relevant velocity scales developed in the literature were reviewed. The influence of the Prandtl number on convective flows was analyzed. The analysis resulted in a new convective velocity scale that is a function of the Prandtl number, and the new scale was found to work well. This new development is expected to render small-scale models more useful in urban wind studies. The new convective velocity scale may be extended to water-modeling studies of other buoyancy-driven airflows.

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