Results 21 to 30 of about 427 (166)
Correlation analysis of solar flux absolute measurements at 161 and 245 MHz
Solar-Terrestrial Physics, 2023 Solar emission in meter waves originates from upper layers of the solar corona. We present absolute measurements of solar flux from Irkutsk Incoherent Scatter Radar (161 MHz frequency) and Learmonth Observatory (245 MHz frequency). We perform correlation
Setov A. G., Kushnarev D. S.
doaj +1 more source
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
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
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
Unraveling the Fine‐Scale Tapestry of Solar Wind at 1AU
Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.Abstract Solar wind is a complex network of distinct magnetic flux tubes, each contained and separated by a current sheet. In this study, more than 50,000 current sheets in the solar wind are identified and characterized for the first time, using multi‐point Cluster observations during solar minimum and maximum intervals.
M. Akhavan‐Tafti +3 more
wiley +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
Terrestrial Gamma‐Ray Flash Following Intense Negative Return Stroke Observed With BIMAP‐3D
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 13, 16 July 2026.Abstract We report ground‐based observations of a terrestrial gamma‐ray flash (TGF) associated with a strong negative cloud‐to‐ground lightning strike (‐CG) which occurred near Los Alamos National Laboratory (LANL) in New Mexico, USA. Gamma photons were detected by the Terrestrial High‐energy Observations of Radiation (THOR) instrument, developed at ...
Daniel P. Jensen +4 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
Beyond small-scale transients: A closer look at the diffuse quiet solar corona
Astronomy & Astrophysics, 2023 Aims. Within the quiet Sun corona imaged at 1 MK, much of the field of view consists of diffuse emission that appears to lack the spatial structuring that is so evident in coronal loops or bright points. Our aim is to determine if these diffuse regions are categorically different in terms of their intensity fluctuations and spatial configuration from ...
Gorman, J. +11 more
openaire +3 more sources