Results 31 to 40 of about 941 (201)
Time-dependent Dynamics of the Corona
The Astrophysical Journal Letters, 2023 We present in this Letter the first global comparison between traditional line-tied steady-state magnetohydrodynamic models and a new, fully time-dependent thermodynamic magnetohydrodynamic simulation of the global corona. To approximate surface magnetic
Emily I. Mason +5 more
doaj +1 more source
Low‐Frequency Radio Observations of the “Quiet” Corona During the Descending Phase of Sunspot Cycle 24 [PDF]
, 2020 We carried out a statistical study of the "quiet" solar corona during the descending phase of the Sunspot Cycle 24 (i.e., January 2015 to May 2019) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 and 80 MHz simultaneously.
R. Ramesh +11 more
core +1 more source
The Astrophysical Journal, 2023 The Miniature X-ray Solar Spectrometer (MinXSS-1) CubeSat observed solar X-rays between 0.5 and 10 keV. A two-temperature, two-emission-measure model is fit to each daily averaged spectrum.
Bennet D. Schwab +2 more
doaj +1 more source
Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun
The Astrophysical Journal, 2023 Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature.
Biswajit Mondal +8 more
doaj +1 more source
Observations of Circularly Polarized Radio Emission from the “Quiet” Sun at Frequencies <100 MHz
The Astrophysical JournalThe presence of the magnetic field makes the solar coronal medium birefringent. Research indicates that an appreciable degree of circular polarization (DCP) can be observed in the thermal radio emission at frequencies
Shaik Sayuf +5 more
doaj +1 more source
Association Between Geomagnetic Activity and Unsuccessful Out‐of‐Hospital Cardiac Arrest
GeoHealth, Volume 10, Issue 6, June 2026.Abstract Out‐of‐hospital cardiac arrests (OHCAs) represent a significant global health challenge, with a survival rate <10%. Recent research has demonstrated that geomagnetic activity (GMA) can disrupt the circadian rhythm. Therefore, GMA may affect patient outcomes after an OHCA event wherein resuscitation is attempted.
Jone Vencloviene +6 more
wiley +1 more source
Relative Elemental Abundances of the Quiet Solar Corona as Determined by SERTS [PDF]
The Astrophysical Journal, 1997 Intensities of extreme-ultraviolet (EUV) spectral lines were measured as a function of radius off the solar limb by two flights (1989 May 5 and 1991 May 7) of the Solar Extreme-ultraviolet Rocket Telescope and Spectrograph (SERTS) for three quiet solar regions. The line-ratio density, line-ratio temperature, and emission measure were determined.
D. A. Falconer +2 more
openaire +1 more source
Hinode/EIS Observation of the Alfvénic Fluctuations in the Quiet Sun
The Astrophysical JournalAlfvénic fluctuations in the corona are regularly observed in EUV imaging and infrared spectroscopic data. We report here on the Doppler velocity fluctuations within the data from the Extreme-Ultraviolet Imaging Spectrometer (EIS) on board Hinode.
Edris Tajfirouze +2 more
doaj +1 more source
Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.Abstract Recent advances in solar physics increasingly rely on automated identification of coronal structures using machine learning. Yet most studies emphasize scientific performance without evaluating feasibility for onboard deployment to prioritize downlink observations.
P. Gonidakis +11 more
wiley +1 more source
Investigating Alfvénic wave propagation in coronal open-field regions
, 2015 The physical mechanisms behind accelerating solar and stellar winds are a long-standing astrophysical mystery, although recent breakthroughs have come from models invoking the turbulent dissipation of Alfvén waves.
Morton, Richard +2 more
core +1 more source