Results 41 to 50 of about 1,202,560 (191)
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
Investigating Alfvénic wave propagation in coronal open-field regions [PDF]
, 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
Seismological demonstration of perpendicular density structuring in the solar corona [PDF]
, 2008 The peculiarities of the propagating transverse waves observed in the solar corona with the CoronalMulti-channel Polarimeter (CoMP)indicate the existence of fine field structuring in the coronal density.
V. M. Nakariakov +7 more
core +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
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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
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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
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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
Ion Temperatures in the Quiet Solar Corona
The Astrophysical Journal, 2007 We measure the upper and lower limits of the temperatures Ti for a number of ions observed in the quiescent solar corona from 1996 to 2000, in order to compare with the measured electron temperature Te and test the assumption Ti = Te commonly adopted to measure the plasma nonthermal velocity vnth.
openaire +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
Earth and Space Science, Volume 13, Issue 9, September 2026.Abstract The F10.7 solar radio flux density, or F10.7, is a disk‐integrated measure of the Sun's total emission at 10.7 cm (2.8 GHz) and is a widely‐used proxy of solar activity. F10.7 emissions primarily originate from the Sun's upper chromosphere and lower corona. High‐frequency, transient “radio bursts” can dramatically increase the magnitude of F10.
C. Kuester +3 more
wiley +1 more source