Results 141 to 150 of about 14,551 (173)

Dawn-dusk Asymmetrical Distribution of Saturn's Cusp. [PDF]

Nat Commun
Xu Y, Yao ZH, Arridge CS, Zhang B, Chen JJ, Badman SV, Ray LC, Coates AJ, Ye SY, Qin TS, Zheng ZQ, Dunn WR, Wei Y.   +12 more
europepmc   +1 more source

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
europepmc   +1 more source

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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
exaly   +4 more sources

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, Krishan V
exaly   +4 more sources

Evolution of magnetic fields and mass flow in a decaying active region [PDF]

Solar Physics, 1992
Five days of coordinated observation were carried out from 24–29 September, 1987 at Big Bear and Huairou Solar Observatories. Longitudinal magnetic fields of an αp sunspot active region were observed almost continuously by the two observatories.
Haimin Wang, Hongqi Zhang, Zhang Hongqi   +2 more
exaly   +4 more sources

Structures of chromospheric magnetic fields in the solar flare producing active region 5747

Solar Physics, 1993
Hongqi Zhang, Zhang Hongqi
exaly   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source