نتایج جستجو برای: sun photosphere
تعداد نتایج: 35728 فیلتر نتایج به سال:
We study the structure and reveal the physical nature of the reversed granulation pattern in the solar photosphere by means of 3-dimensional radiative hydrodynamics simulations. We used the MURaM code to obtain a realistic model of the near-surface layers of the convection zone and the photosphere. The pattern of horizontal temperature fluctuations at the base of the photosphere consists of rel...
New abundance tables have been compiled for Cl chondrites and the solar photosphere and corona, based on a critical review of the literature to mid-1988. The meteorite data are generally accurate to +5-10%. Significant discrepancies between Sun and meteorites occur only for Fe, Mn, Ge, Pb, and W; other well-determined elements agree to &90/o on the average. There is no evidence for group fracti...
[1] The solar wind has been measured directly from 0.3 AU outward, and the Sun’s atmosphere has been imaged from the photosphere out through the corona. These observations have significantly advanced our understanding of the influence of the Sun’s varying magnetic field on the structure and dynamics of the corona and the solar wind. However, how the corona is heated and accelerated to produce t...
We have derived new abundances of the rare-earth elements Pr, Dy, Tm, Yb, and Lu for the solar photosphere and for five very metal-poor, neutron-capture r-process-rich giant stars. The photospheric values for all five elements are in good agreement with meteoritic abundances. For the low metallicity sample, these abundances have been combined with new Ce abundances from a companion paper, and r...
Gamma rays are produced by cosmic ray (CR) protons interacting with the particles at solar photosphere and electrons positrons (CRes) via inverse Compton scattering of photons. The former come from disk while latter extend beyond disk. Evaluation these emissions requires flux spectrum CRs in vicinity Sun, most observations provide spectra near Earth, around 1 AU Sun. Past estimates quiet Sun ga...
The solar surface dynamo has become an active area of research in an attempt to understand the origin of a variety of magnetic field structures on the sun. The major modification that needs to be incorporated in the standard dynamo process is the inclusion of the partial ionization of the gas in the layers underlying and overlaying the photosphere along with the effects associated with the mult...
Coverage of plasma motions is limited to the line-of-sight component at Sun’s surface. Multiple tracking and inversion methods were developed infer transverse from observational data. Recently, DeepVel neural network was trained with computations performed by numerical simulations solar photosphere recover missing surface two additional optical depths simultaneously white light intensity in Qui...
The H{\alpha} line is an important optical in solar observations containing the information from photosphere to chromosphere. To study mechanisms of eruptions and plasma dynamics lower atmosphere, Chinese Solar Explorer (CHASE) was launched into a Sun-synchronous orbit on October 14, 2021. scientific payload CHASE satellite Imaging Spectrograph (HIS). CHASE/HIS acquires, for first time, seeing-...
We report the discovery of supersonic downflows in a sunspot light bridge using measurements taken with the spectropolarimeter on board the Hinode satellite. The downflows occur in small patches close to regions where the vector magnetic field changes orientation rapidly, and are associated with anomalous circular polarization profiles. An inversion of the observed Stokes spectra reveals veloci...
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