Results 191 to 200 of about 10,085,228 (216)

Magnetic star-planet interaction in the young exoplanet system DS Tucanae Ab

Santos Ld, Owen J, Duvvuri G, Loyd ROP, Vidotto A, Presa A, Bourrier V, King G, Airapetian V, Ehrenreich D, France K, Lendl M, Lothringer J, Nielsen L.   +13 more
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H? Doppler-velocity fields within sites of flares in a solar active region

Solar Physics, 1996
In this paper, we analyze the relationship between photospheric magnetic fields and chromospheric velocity fields in a solar active region, especially evolving features of the chromospheric velocity field at preflare sites. It seems that flares are related to unusually distributed velocity field structures, and initial bright kernels and ribbons of the
Wei Li, Guoxiang Ai, Hongqi Zhang
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Statistical mechanics of velocity and magnetic fields in solar active regions

Solar Physics, 1985
A statistical mechanics of the velocity and magnetic fields is formulated for an active region plasma. The plasma subjected to the conservation laws emerges in a most probable state which is described by an equilibrium distribution function containing a lagrange multiplier for every invariant of the system.
V Krishan
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Radial velocity field in the lower atmosphere of the solar active region during a flare with an ejection: The initial phase of the flare

Kinematics and Physics of Celestial Bodies, 2011
Horizontal motion has been studied of the matter along the active region at different heights of the photosphere (115–580 km) in the initial phase of the two-ribbon solar flare on September 4, 1990, near the solar limb, accompanied by the ejection. Photospheric velocities varied in the range −3.5 ... 2.5 km/s. The direction of motion in the photosphere
N. N. Kondrashova, M. N. Pasechnik
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Dynamics of line-of-sight velocities and magnetic field in the solar photosphere during the formation of the large active region NOAA 10488

Astronomy Letters, 2007
Analysis of SOHO longitudinal magnetograms and Dopplergrams has revealed the appearance of a region of enhanced upflow of matter in the photosphere when the top of a loop-shaped magnetic flux tube forming a large active region passed through it. The maximum upflow velocity reached 2 km s−1, the maximum size exceeded 20 000 km, and the lifetime was ...
V. M. Grigor’ev, L. V. Ermakova, A. I. Khlystova   +2 more
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Fine-scan velocity and magnetic-field measurements in solar active regions

Solar Physics, 1971
Fine scan (5″ × 5″ aperture) simultaneous Doppler and magnetograms have been obtained over solar active regions near the central meridian passage. Besides the mainly horizontal Evershed motion in sunspots, there appears a conspicuous descending motion over all active regions.
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Solar Active Region Detection Using Deep Learning

Electronics (Switzerland), 2021
Long Xu, Lin Quan
exaly  

The evolution of a spot–spot-type solar active region which produced a major solar eruption

Frontiers in Astronomy and Space Sciences, 2023
exaly