Results 81 to 90 of about 242,574 (198)

The 11-year solar cycle, the 27-day Sun's rotation and the area of the stratospheric Aleutian high

Meteorologische Zeitschrift, 2001
The effect of the 11-year solar cycle on the 30-hPa geopotential height and temperature fields in the area of the Aleutian high caused by solar activity oscillations resulting from the Sun's rotation (27.2 d) is investigated, applying methods of ...
Boris Soukharev, Karin Labitzke
doaj   +1 more source

A solar cycle clock for extreme space weather

Scientific Reports
The variable solar cycle of activity is a long-standing problem in physics. It modulates the overall level of space weather activity at earth, which in turn can have significant societal impact.
S. C. Chapman, T. Dudok de Wit
doaj   +1 more source

Galactic rotation outside the solar circle [PDF]

Symposium - International Astronomical Union, 1985
New radial velocities and optical distances for partly very distant HII regions give evidence for a rising rotation curve in the outer parts of the Galaxy.
openaire   +1 more source

Time Variation of the Solar Tachocline

The Astrophysical Journal
We have used solar oscillation frequencies and frequency splittings obtained over solar cycles 23 and 24 and the rising phase of solar cycle 25 to investigate whether the tachocline properties (the change in the rotation rate across the tachocline. i.e.,
Sarbani Basu, Wesley Antônio Machado Andrade de Aguiar, Sylvain G. Korzennik   +2 more
doaj   +1 more source

Modeling Solar Oscillation Power Spectra. III. Spatiotemporal Spectra of Solar Granulation Velocity Field as Seen in HMI Velocity Measurements

The Astrophysical Journal
We suggest a physically motivated model of the uncorrelated background, which can be used to improve the accuracy of helioseismic frequency measurements when the background contributes significantly to the formation of spectral lines of acoustic ...
Sergei V. Vorontsov, Stuart M. Jefferies, Timothy P. Larson   +2 more
doaj   +1 more source

Helioseismic Properties of Dynamo Waves in the Variation of Solar Differential Rotation

The Astrophysical Journal
Solar differential rotation exhibits a prominent feature: its cyclic variations over the solar cycle, referred to as zonal flows or torsional oscillations, are observed throughout the convection zone.
Krishnendu Mandal, Alexander G. Kosovichev, Valery V. Pipin   +2 more
doaj   +1 more source

Characterizing the Observational Properties of the Sun’s High-latitude m = 1 Inertial Mode

The Astrophysical Journal
Low- m inertial modes have been recently discovered in the Sun’s high-latitude regions. In this study, we characterize the observational properties of the m = 1 mode by analyzing time–distance subsurface flow maps.
Boyang Ding, Junwei Zhao, Ruizhu Chen, Matthias Waidele, Sushant S. Mahajan, Oana Vesa   +5 more
doaj   +1 more source

Resolving the Tachocline Using Inversion of Rotational Splitting Derived from Fitting Very Long and Long Time Series

The Astrophysical Journal
We use rotation splittings derived from very long and long time series, namely 25.2, 12.6, and 6.3 yr long, computed by S. G. Korzennik independent methodology to characterize the solar tachocline and its variation with latitude and time.
Sylvain G. Korzennik, Antonio Eff-Darwich   +1 more
doaj   +1 more source

Do Faculae Affect Autocorrelation Rotation Periods in Sun-like Stars?

The Astrophysical Journal
Rotational periods derived from autocorrelation function (ACF) techniques on stars photometrically similar to the Sun in Kepler data have proven difficult to reliably determine.
Canis Li, Gibor Basri
doaj   +1 more source

Tidal Evolution of Exoplanets

, 2010
Tidal effects arise from differential and inelastic deformation of a planet by a perturbing body. The continuous action of tides modify the rotation of the planet together with its orbit until an equilibrium situation is reached.
Correia, Alexandre C. M., Laskar, Jacques   +1 more
core   +1 more source