Results 81 to 90 of about 1,010,043 (218)
Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 3, September 2025.Abstract Recently, many machine learning‐based models have been developed to predict geomagnetic activity several days in advance directly from space‐borne solar imaging. To better understand and improve these models, we compare dimensionality reduction techniques to extract abstract features from solar images for space weather‐related downstream tasks.
Maria Tahtouh +5 more
wiley +1 more source
Dynamics of the solar chromosphere
, 2001 We analyze oscillations in the solar atmosphere using image sequences from the Transition Region and Coronal Explorer (TRACE) in three ultraviolet passbands which sample the upper solar photosphere and low chromosphere.
T. D. Tarbell +5 more
core +1 more source
Deriving the Coronal Separatrix‐Web With the WSA Model
Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.Abstract We demonstrate a new capability of the Wang‐Sheeley‐Arge (WSA) model to routinely derive the coronal separatrix web (S‐web) as a standard data product. We describe our methodology for deriving the squashing factor (Q $Q$) and we use Carrington rotation (CR) 2109 to illustrate the validation of our output with that derived from the POT3D model.
Samantha Wallace +5 more
wiley +1 more source
Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.Abstract Working toward the goal of understanding solar wind (SW) entry to the Earth's magnetosphere, this study examines solar‐origin ion composition in the magnetotail. During its trajectory, Wind spent a significant amount of time in the Earth's magnetotail, where its SupraThermal Ion Composition Spectrometer (STICS) measured the mass and mass per ...
S. Colón‐Rodríguez +3 more
wiley +1 more source
The differential rotation of the chromosphere and the quiet chromosphere in the falling and rising period of a solar cycle [PDF]
The full-disk chromosphere was routinely monitored in the He I 10830\AA\, line at the National Solar Observatory/Kitt Peak from 2004 Nov. to 2013 March, and thereby, synoptic maps of He I line intensity from Carrington rotations 2032 to 2135 were ...
Xu, JC, Li, KJ
core +1 more source
Identifying Plasma Fractionation Processes in the Chromosphere Using IRIS
The Astrophysical JournalThe composition of the solar corona differs from that of the photosphere, with the plasma thought to fractionate in the solar chromosphere according to the first ionization potential (FIP) of the different elements.
David M. Long +9 more
doaj +1 more source
ALFVÉN WAVE HEATING of the SOLAR CHROMOSPHERE: 1.5D MODELS
, 2016 ALFVÉN WAVE HEATING of the SOLAR CHROMOSPHERE: 1.5D ...
Sergiy Shelyag (13094397) +2 more
core
The Bright Rim Prominences according to 2.5D Radiative Transfer
The Astrophysical Journal LettersSolar prominences observed close to the limb commonly include a bright feature that, from the perspective of the observer, runs along the interface between itself and the underlying chromosphere. Despite several idealized models being proposed to explain
Jack M. Jenkins +4 more
doaj +1 more source
Zero-Field Dichroism in the Solar Chromosphere
Physical Review Letters, 2003 We explain the linear polarization of the Ca II infrared triplet observed close to the edge of the solar disk. In particular, we demonstrate that the physical origin of the enigmatic polarizations of the 866.2 nm and 854.2 nm lines lies in the existence of atomic polarization in their metastable lower levels, which produces differential absorption of ...
Sainz, R. Manso, Bueno, J. Trujillo
openaire +3 more sources