Mechanisms for MHD Poynting flux generation in simulations of solar photospheric magneto-convection [PDF]
, 2012 We investigate the generation mechanisms of MHD Poynting flux in the magnetised solar photosphere. Using radiative MHD modelling of the solar photosphere with initial magnetic configurations that differ in their field strength and geometry, we show the ...
Bonet +4 more
core +2 more sources
Diminishing activity of recent solar cycles (22–24) and their impact on geospace
Journal of Space Weather and Space Climate, 2019 This study examines the variation of different energies linked with the Sun and the Earth’s magnetosphere-ionosphere systems for solar cycles (SCs) 22–24 for which the gradual decrease in the solar activity is noticed.
Kakad Bharati +3 more
doaj +1 more source
Vortices, shocks, and heating in the solar photosphere: effect of a magnetic field [PDF]
, 2012 Aims: We study the differences between non-magnetic and magnetic regions in the flow and thermal structure of the upper solar photosphere. Methods: Radiative MHD simulations representing a quiet region and a plage region, respectively, which extend into ...
Cameron +22 more
core +1 more source
The Astrophysical Journal, 2023 In solving the solar coronal heating problem, it is crucial to comprehend the mechanisms by which energy is conveyed from the photosphere to the corona. Recently, magnetic tornadoes, characterized as coherent, rotating magnetic-field structures extending
Hidetaka Kuniyoshi +3 more
doaj +1 more source
A Model for the Sources of the Slow Solar Wind [PDF]
, 2011 Models for the origin of the slow solar wind must account for two seemingly contradictory observations: The slow wind has the composition of the closed field corona, implying that it originates from the continuous opening and closing of flux at the ...
Antiochos, S. K. +4 more
core +3 more sources
The convection of close red supergiant stars observed with near-infrared interferometry
, 2015 Our team has obtained observations of the photosphere of the two closest red supergiant stars Betelgeuse ($\alpha$ Ori) and Antares ($\alpha$ Sco) using near infrared interferometry.
Aurière, Michel +4 more
core +2 more sources
Analysis of the Flux and Polarization Spectra of the Type Ia Supernova SN 2001el: Exploring the Geometry of the High-velocity Ejecta [PDF]
, 2003 SN 2001el is the first normal Type Ia supernova to show a strong, intrinsic polarization signal. In addition, during the epochs prior to maximum light, the CaII IR triplet absorption is seen distinctly and separately at both normal photospheric ...
Brown J. C. +20 more
core +2 more sources
Twisted flux tube emergence from the convection zone to the corona
, 2007 3D numerical simulations of a horizontal magnetic flux tube emergence with different twist are carried out in a computational domain spanning the upper layers of the convection zone to the lower corona.
Carlsson M. +9 more
core +1 more source
The role of torsional Alfven waves in coronal heating [PDF]
, 2009 In the context of coronal heating, among the zoo of MHD waves that exist in the solar atmosphere, Alfven waves receive special attention. Indeed, these waves constitute an attractive heating agent due to their ability to carry over the many different ...
Antiochos +40 more
core +1 more source
Global solar photospheric and coronal magnetic field over activity cycles 21–25
Journal of Space Weather and Space ClimateThe evolution of the global solar magnetic field from the beginning of cycle 21 (mid-1970s) until the currently-ascending cycle 25 is described using photospheric full-disk and synoptic magnetograms from NSO Kitt Peak Vacuum Telescope (KPVT) 512-channel ...
Petrie Gordon J. D.
doaj +1 more source