Search results for "Magnetogram"

showing 3 items of 3 documents

The intensity contrast of solar photospheric faculae and network elements : II. Evolution over the rising phase of solar cycle 23

2006

We studied the radiative properties of small magnetic elements (active region faculae and the network) during the rising phase of solar cycle 23 from 1996 to 2001, determining their contrasts as a function of heliocentric angle, magnetogram signal, and the solar cycle phase. We combined near-simultaneous full disk images of the line-of-sight magnetic field and photospheric continuum intensity provided by the MDI instrument on board the SOHO spacecraft. Sorting the magnetogram signal into different ranges allowed us to distinguish between the contrast of different magnetic structures. We find that the contrast center-to-limb variation (CLV) of these small magnetic elements is independent of …

:ASTRONOMÍA Y ASTROFÍSICA::Sistema solar [UNESCO]PlagesFOS: Physical sciencesSolar cycle 23AstrophysicsAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAFaculaeMagnetogramSun activityRadiative transferAstrophysics::Solar and Stellar AstrophysicsPhysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Sistema solarSpacecraftbusiness.industryAstrophysics (astro-ph)SunContrast (statistics)Astronomy and AstrophysicsMagnetic fluxMagnetic fieldOn boardSun activity ; Faculae ; Plages ; Sun ; Magnetic fieldsSpace and Planetary ScienceMagnetic fieldsPhysics::Space PhysicsAstrophysics::Earth and Planetary Astrophysicsbusiness:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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Evidence of small-scale magnetic concentrations dragged by vortex motion of solar photospheric plasma

2010

Vortex-type motions have been measured by tracking bright points in high-resolution observations of the solar photosphere. These small-scale motions are thought to be determinant in the evolution of magnetic footpoints and their interaction with plasma and therefore likely to play a role in heating the upper solar atmosphere by twisting magnetic flux tubes. We report the observation of magnetic concentrations being dragged towards the center of a convective vortex motion in the solar photosphere from high-resolution ground-based and space-borne data. We describe this event by analyzing a series of images at different solar atmospheric layers. By computing horizontal proper motions, we detec…

ConvectionProper motion:ASTRONOMÍA Y ASTROFÍSICA::Sistema solar [UNESCO]photosphere [Sun]FOS: Physical sciencesAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAConvectionMagnetogramAstrophysics::Solar and Stellar AstrophysicsSolar and Stellar Astrophysics (astro-ph.SR)PhysicsPhotosphereUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Sistema solarConvection; Sun: granulation; Sun: photosphere; Magnetic fieldsAstronomy and AstrophysicsMagnetic fluxMagnetic fieldVortexAtmosphere of EarthAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceMagnetic fieldsPhysics::Space PhysicsAstrophysics::Earth and Planetary Astrophysicsgranulation [Sun]:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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Coronal magnetograms of solar active regions

2004

A series of coronal magnetograms, related to the active region NOAA 9068 is derived using the effects of the quasi-transverse (QT-) propagation at microwaves. In the assumption that the product of the electron density N and the scale of magnetic divergence Ld is constant and equal to 10 18 cm −2 , the sensitivity of the measurements peaks at B(G) ≈ 180 λ −4/3 (cm), where λ is the observational wavelength. The radio maps of the Sun taken with the Solar Siberian Radio Telescope (SSRT) at λ =5 .2 cm were sampled and converted into the 2D coronal magnetograms supplying absolute values of the total magnetic vector � B in the range 10 - 30 G. Each coronal magnetogram covers the portion of the mic…

PhysicsRadio telescopeElectron densityWavelengthMagnetogramSpace and Planetary ScienceCoronal planeAstronomyAstronomy and AstrophysicsCoronal loopCoronaMicrowaveProceedings of the International Astronomical Union
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