Results 11 to 20 of about 1,202,560 (191)
Radio observations of the quiet solar corona
Advances in Space Research, 1994 Abstract Observations of radio emission from the quiet solar atmosphere and the associated emission mechanisms are discussed. Long wavelength observations, with a spatial resolution of ∼1 arc min are ideal for the study of the large scale structure of the corona, including coronal holes, arches, streamers and the base of the heliospheric current ...
C E Alissandrakis
exaly +4 more sources
Energy Distribution of Microevents in the Quiet Solar Corona
Astrophysical Journal, 2002 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. The changes in coronal emission measure indicate impulsive heating of new material to coronal temperatures. These heating or evaporation events are candidate signatures of "nanoflares" or
Arnold Benz
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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
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Estimating the contribution of Alfvén waves to the process of heating the quiet solar corona [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 We solve numerically the ideal MHD equations with an external gravitational field in 2D in order to study the effects of impulsively generated linear and non-linear Alfvén waves into isolated solar arcades and coronal funnels. We analyze the region containing the interface between the photosphere and the corona.
Gonzalez-Aviles, J. J., Guzman, F. S.
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Beyond small-scale transients: A closer look at the diffuse quiet solar corona
Astronomy and 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 ...
Luca Teriaca +2 more
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SPATIOTEMPORAL ORGANIZATION OF ENERGY RELEASE EVENTS IN THE QUIET SOLAR CORONA [PDF]
The Astrophysical Journal, 2014 Using data from STEREO and SOHO spacecraft, we show that temporal organization of energy release events in the quiet solar corona is close to random, in contrast to the clustered behavior of flaring times in solar active regions. The locations of the quiet-Sun events follow the meso- and supergranulation pattern of the underling photosphere.
Uritsky, Vadim M., Davila, Joseph M.
openaire +3 more sources
Propagating and Stationary Bright Knots in the Quiet Solar Corona
The Astrophysical JournalSmall-sized localized brightenings are an important candidate for resolving the problem of the solar atmospheric heating. They are spread over the whole solar disk and are suggested to be caused by magnetic reconnection or wave dissipation.
Shaoxuan Tong, Jun Zhang
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Astrophysical Journal, 1983 High spatial resolution observations of the ultraviolet solar spectrum which reveal high-energy events in the quiet sun are presented. The tandem Wadsworth spectrograph used to make the observations is described along with the observing techniques, and a brief description of the characteristics of high-resolution transition zone spectra is given.
J -D F Bartoe, G E Brueckner
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On the Impulsive Heating of Quiet Solar Corona [PDF]
The Astrophysical Journal, 2021 AbstractThe solar corona consists of a million degree Kelvin plasma. A complete understanding of this phenomenon demands the study of quiet Sun (QS) regions. In this work, we study QS regions in the 171 Å, 193 Å, and 211 Å passbands of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, by combining the empirical impulsive ...
Vishal Upendran, Durgesh Tripathi
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Fleeting Small-scale Surface Magnetic Fields Build the Quiet-Sun Corona
The Astrophysical Journal Letters, 2023 Arch-like loop structures filled with million Kelvin hot plasma form the building blocks of the quiet-Sun corona. Both high-resolution observations and magnetoconvection simulations show the ubiquitous presence of magnetic fields on the solar surface on ...
L. P. Chitta +21 more
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