Results 71 to 80 of about 14,964 (204)
The Astrophysical Journal, 2023 The intensity and the linear scattering polarization profiles of the hydrogen Ly α line encode valuable information on the thermodynamic and magnetic structure of the upper layers of the solar chromosphere.
E. Alsina Ballester +2 more
doaj +1 more source
Twisted flux tube emergence from the convection zone to the corona II: Later states
, 2009 3D simulations of magnetic flux emergence are carried out in a computational domain spanning the upper layers of the convection zone to the lower corona.
Abbett +23 more
core +1 more source
Formation of the Transition Region for the Quiet Sun
The Astrophysical Journal Letters, 2023 We propose a partially ionized collisional two-fluid model of the formation of the transition region between the cool dense chromosphere and hot tenuous corona for the quiet Sun.
Paul Song, Jiannan Tu, David B. Wexler
doaj +1 more source
, 2007 The impulsive phase of a solar flare marks the epoch of rapid conversion of energy stored in the pre-flare coronal magnetic field. Hard X-ray observations imply that a substantial fraction of flare energy released during the impulsive phase is converted ...
Aschwanden M. J. +15 more
core +1 more source
Radiative accretion shocks along nonuniform stellar magnetic fields in classical T Tauri stars [PDF]
, 2013 (abridged) AIMS. We investigate the dynamics and stability of post-shock plasma streaming along nonuniform stellar magnetic fields at the impact region of accretion columns.
Argiroffi, C. +11 more
core +5 more sources
Slow Solar Wind: Origin in an Independent Small‐Scale Solar Dynamo
Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.Abstract Separation of the solar wind (SW) into three flow types (coronal mass ejections (CMEs), high speed streams (HSSs), and slow solar wind (SSW)) reveals an inverse relationship between the percentage of time Earth spends in SSW during a year and its annually averaged magnetic field strength (B).
E. W. Cliver +2 more
wiley +1 more source
Magnetohydrodynamic waves driven by p-modes
, 2013 Waves are observed at all layers of the solar atmosphere and the magnetic field plays a key role in their propagation. While deep down in the atmosphere the p-modes are almost entirely of acoustic nature, in the upper layers magnetic forces are ...
Khomenko, Elena +1 more
core +1 more source
NOAA's National Centers for Environmental Information Space Weather Data Inventory Status
Space Weather, Volume 23, Issue 7, July 2025.Abstract We present here an updated overview of the Space Weather data curated and/or generated, improved, archived, and disseminated by the Solar Terrestrial Physics (STP) Section of the National Centers for Environmental Information (NCEI) in the National Oceanic and Atmospheric Administration (NOAA).
Alessandra Abe Pacini +2 more
wiley +1 more source
Non-WKB Models of the FIP Effect: The Role of Slow Mode Waves
, 2011 A model for element abundance fractionation between the solar chromosphere and corona is further developed. The ponderomotive force due to Alfven waves propagating through, or reflecting from the chromosphere in solar conditions generally accelerates ...
Allan +32 more
core +1 more source
Chromospheric Evershed flow [PDF]
Astronomy & Astrophysics, 2003 We studied the chromospheric Evershed flow from filtergrams obtained at nine wavelengths along the Hα profile. We computed line-of-sight velocities based on Becker's cloud model and we determined the components of the flow velocity vector as a function of distance from the center of the sunspot, assuming an axial symmetry of both the spot and the flow.
Georgakilas, A. A. +3 more
openaire +2 more sources