Results 11 to 20 of about 318 (133)
Small-scale swirl events in the quiet Sun chromosphere [PDF]
Astronomy & Astrophysics, 2009 4 pages, 3 figures, A&A Letter, accepted (final version)
Wedemeyer-Böhm, Sven +1 more
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Inference of chromospheric plasma parameters on the Sun [PDF]
Astronomy & Astrophysics, 2020 The solar chromosphere can be observed well through strong absorption lines. We infer the physical parameters of chromospheric plasmas from these lines using a multilayer spectral inversion. This is a new technique of spectral inversion. We assume that the atmosphere consists of a finite number of layers.
Chae, Jongchul +3 more
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CHROMOSPHERIC MAGNETIC RECONNECTION ON THE SUN [PDF]
Journal of The Korean Astronomical Society, 2002 Solar observations support that magnetic reconnect ion ubiquitously occurs in the chromosphere as well as in the corona. It is now widely accepted that coronal magnetic reconnect ion is fast reconnect ion of the Petschek type, and is the main driver of solar flares.
JONGCHUL CHAE +2 more
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Observations of ubiquitous compressive waves in the Sun’s chromosphere [PDF]
Nature Communications, 2012 The details of the mechanism(s) responsible for the observed heating and dynamics of the solar atmosphere still remain a mystery. Magnetohydrodynamic (MHD) waves are thought to play a vital role in this process. Although it has been shown that incompressible waves are ubiquitous in off-limb solar atmospheric observations their energy cannot be readily ...
Morton, R.J. +6 more
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Properties of shock waves in the quiet-Sun chromosphere
Astronomy & Astrophysics, 2022 Context.Short-lived (100 s or less), sub-arcsec to a couple of arcsec sized features of enhanced brightenings in the narrowband images at the H2Vand K2Vpositions of the Ca IIH&K lines in the quiet Sun are known as bright grains. These bright grains are interpreted as manifestations of acoustic shock waves in the chromosphere.Aims.We aim to study ...
Harsh Mathur +4 more
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An overall view of temperature oscillations in the solar chromosphere with ALMA. [PDF]
Philos Trans A Math Phys Eng Sci, 2021 Jafarzadeh S +14 more
europepmc +2 more sources
Chromospheric Cannonballs on the Sun
The Astrophysical Journal Letters, 2019 Abstract In the highly dynamic chromosphere, there exist many kinds of small-scale activities, such as spicules, surges, and Ellerman bombs. Here, we report the discovery of a new phenomenon in the chromosphere observed with the New Vacuum Solar Telescope at the Fuxian Solar Observatory.
Shuhong Yang +4 more
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Chromospheric activity of nearby Sun-like stars [PDF]
Astronomy & Astrophysics, 2020 Context.The chromospheric emission in the cores of the Ca IIH & K lines of late-type dwarfs is a well known indicator of magnetic activity that decreases with increasing stellar age.Aims.I use this indicator to investigate the formation history of nearby G- and early K-type stars with origins at galactocentric distances similar to that of the ...
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The quiet-Sun photosphere and chromosphere [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012 The overall structure and the fine structure of the solar photosphere outside active regions are largely understood, except possibly the important roles of a turbulent near-surface dynamo at its bottom, internal gravity waves at its top and small-scale vorticity.
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Chromospheric Heating due to Cancellation of Quiet Sun Internetwork Fields [PDF]
The Astrophysical Journal, 2018 Abstract The heating of the solar chromosphere remains one of the most important questions in solar physics. Our current understanding is that small-scale internetwork (IN) magnetic fields play an important role as a heating agent. Indeed, cancellations of IN magnetic elements in the photosphere can produce transient brightenings in the ...
M. Gošić +7 more
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