Results 11 to 20 of about 14,709 (209)
LOFAR observations of the quiet solar corona [PDF]
Astronomy & Astrophysics, 2018 Context. The quiet solar corona emits meter-wave thermal bremsstrahlung. Coronal radio emission can only propagate above that radius, Rω, where the local plasma frequency equals the observing frequency. The radio interferometer LOw Frequency ARray (LOFAR) observes in its low band (10–90 MHz) solar radio emission originating from the middle and upper ...
Vocks, C. +11 more
openaire +6 more sources
Multi-scale statistical analysis of coronal solar activity [PDF]
Nonlinear Processes in Geophysics, 2016 Multi-filter images from the solar corona are used to obtain temperature maps that are analyzed using techniques based on proper orthogonal decomposition (POD) in order to extract dynamical and structural information at various scales.
D. Gamborino +2 more
doaj +4 more sources
Multifrequency Microwave Imaging of Weak Transients from the Quiet Solar Corona
The Astrophysical Journal, 2023 Understanding the dynamics of the quiet solar corona is important for answering key questions including the coronal heating problem. Multiple studies have suggested small-scale magnetic-reconnection events may play a crucial role.
Surajit Mondal, Bin Chen, Sijie Yu
doaj +3 more sources
Slow wind belt in the quiet solar corona
Physics of Plasmas, 2023 The slow solar wind belt in the quiet corona, observed with the Metis coronagraph on board Solar Orbiter on May 15, 2020, during the activity minimum of the cycle 24, in a field of view extending from 3.8 R⊙ to 7.0 R⊙, is formed by a slow and dense wind stream running along the coronal current sheet, accelerating in the radial direction and reaching at
E. Antonucci +18 more
openaire +6 more sources
Automated coronal hole identification via multi-thermal intensity segmentation
Journal of Space Weather and Space Climate, 2018 Coronal holes (CH) are regions of open magnetic fields that appear as dark areas in the solar corona due to their low density and temperature compared to the surrounding quiet corona.
Garton Tadhg M. +2 more
doaj +2 more sources
Energy Distribution of Micro-events in the Quiet Solar Corona [PDF]
The Astrophysical Journal, 2001 Recent imaging observations of EUV line emissions have shown evidence for frequent flare-like events in a majority of the pixels in quiet regions of the solar corona.
Arnold O. Benz +15 more
core +3 more sources
Formation of suprathermal electron distributions in the quiet solar corona [PDF]
Astronomy & Astrophysics, 2008 Summary: Context. Solar wind electron velocity distribution functions (VDFs) show enhanced levels of suprathermal electrons as compared to a Maxwellian distribution. Previous studies show that the suprathermal tails of solar wind VDFs can be fitted by kappa distributions, and that a coronal origin of the suprathermal electrons is possible. Aims.
Vocks, C., Mann, G., Rausche, G.
openaire +3 more sources
Transient small-scale brightenings in the quiet solar corona: A model for campfires observed with Solar Orbiter [PDF]
Astronomy & Astrophysics, 2021 Context. Recent observations by the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter have characterized prevalent small-scale transient brightenings in the corona above the quiet Sun termed campfires. Aims. In this study we search for comparable brightenings in a numerical model and then investigate their relation to the magnetic field and the ...
Chen, Yajie +5 more
openaire +6 more sources
Quiet solar corona: daily images at 8.8–10.7 cm wavelengths
Solar-Terrestrial Physics, 2023 We discuss results of test observations of the 3–6 GHz range array of the Siberian Radio Heliograph (SRH). A method for calibrating brightness temperatures of images was verified using measurements of the brightness temperature of the quiet Sun at a ...
Altyntsev A. T. +2 more
doaj +2 more sources
Measuring the Magnetic-Field Strength of the Quiet Solar Corona Using “EIT Waves” [PDF]
Solar Physics, 2013 20 pages, 7 figures, accepted for publication in Solar ...
Long +7 more
exaly +5 more sources