Results 251 to 260 of about 10,569,280 (283)

Investigation of magnetic fields in solar active regions

Astronomy Reports, 2000
The magnetic-field structure in solar active regions outside spots is studied. The line-of-sight fields were measured using the new Crimean digital magnetograph in three spectral lines—Fe I 5253 A, Fe II 5234 A, and Ti I 5193 A. Observations in the Fe II 5234 A line indicate systematically higher field strengths than those in the Fe I 5253 A line.
S. I. Gopasyuk, O. S. Gopasyuk, I. P. Zalesov, D. V. Karkach, V. V. Svistel’nikov   +4 more
openaire   +1 more source

Solar Flare Acceleration of Solar Wind: Influence of Active Region Magnetic Field

Science, 1981
The direction of the photospheric magnetic field at the site of a solar flare is a good predictor of whether the flare will accelerate solar wind plasma. If the field has a southward component, high-speed solar wind plasma is usually observed near the earth about 4 days later. If the field has a northward component, such high-speed solar wind is almost
H, Lundstedt, J M, Wilcox, P H, Scherrer
openaire   +2 more sources

Influence of a solar active region on the interplanetary magnetic field

Solar Physics, 1968
Interplanetary magnetic field sectors evolution /1964-1965/, discussing solar active region development leading to magnetic loops in interplanetary ...
Kenneth H. Schatten, Norman F. Ness, John M. Wilcox   +2 more
openaire   +1 more source

CONFIGURATION OF THE MAGNETIC FIELD IN SOLAR ACTIVE REGIONS

Solar Physics, 1997
In this paper we present the observational results of chromospheric and photospheric magnetograms in active regions obtained at the Huairou Solar Observing Station of the Beijing Astronomical Observatory. Simultaneous observations of the chromospheric and photospheric magnetic fields enable us to construct a possible configuration of the magnetic field
openaire   +1 more source

On the Magnetic Field Activity in Solar Active Regions

1991
In this short note a new method of analysis of the complexity and of the reactivity of ensembles of magnetic features in the solar active regions is proposed and briefly discussed.
openaire   +1 more source

Photographic maps of magnetic fields of solar active regions

Chinese Astronomy, 1979
This paper describes our daily photography of maps of the strong magnetic fields in solar active regions. In one case, the isogauss line at 2000 G in a complex magnetic region is seen to coincide with the optical outline of a sunspot umbra.
null Ding You-ji, null Peng Fang-lin, null Zhong Shu-hua, null Li Bo-shu, null Ye Hui-lian, null Luan Di   +5 more
openaire   +1 more source

Modeling the distribution of magnetic fluxes in field concentrations in a solar active region

Solar Physics, 1997
Much of the magnetic field in solar and stellar photospheres is arranged into clusters of “flux tubes”, i.e., clustered into compact areas in which the intrinsic field strength is approximately a kilogauss. The flux concentrations are constantly evolving as they merge with or annihilate against other concentrations, or fragment into smaller ...
Carolus J. Schrijver, Alan M. Title, Hermance J. Hagenaar, Richard A. Shine   +3 more
openaire   +1 more source

On the causes of the observed magnetic field imbalance in solar active regions

Astronomy Letters, 2006
Based on a topological magnetic field model for active region (AR) 8086 observed on September 15–21, 1997, we calculate the evolution of the magnetic flux imbalance during its disk passage. We have established possible causes of the observed imbalance. Using model ARs produced by perfectly balanced magnetic field sources as examples, we show that even ...
I. V. Oreshina, B. V. Somov
openaire   +1 more source

Coronal Magnetic Field Structure in Solar Active Regions

PLANETARY RADIO EMISSIONS VII, 2011
We analyzed the structure of the magnetic field in active regions at coronal altitudes, determined using multiwavelength observations of polarized radio emission in the microwave range at the radiotelescope RATAN-600. The observations were compared with the current-free magnetic field extrapolation of the photospheric field.
openaire   +1 more source

Magnetic field line topology in solar active regions

AIP Conference Proceedings, 1992
According to a recent study comparing magnetic fields extrapolated from photospheric measurements with chromospheric and coronal observations, the electric current helicity in active regions possesses a predominant sign in each of the two solar hemispheres.
openaire   +1 more source