Results 21 to 30 of about 1,264 (196)
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
, 2005 The angular velocities of chromosphere and photosphere are calculated for 1987–1990 on the basis of heliographic coordinates of the chromospheric flares and sunspots (Solar Geophysical Data). The time resolution accepted is 0.25 year. The mean equatorial
В. В. Касинский +1 more
core +4 more sources
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
openaire +3 more sources
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
openaire +5 more sources
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
openaire +1 more source
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
openaire +2 more sources
ALMA Detection of Dark Chromospheric Holes in the Quiet Sun [PDF]
The Astrophysical Journal Letters, 2019 Abstract We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of a quiet-Sun region at a wavelength of 3 mm, obtained during the first solar ALMA cycle on 2017 April 27, and compare them with available chromospheric observations in the UV and visible as well as with photospheric magnetograms.
Maria A. Loukitcheva +2 more
openaire +3 more sources
ON THE MISALIGNMENT BETWEEN CHROMOSPHERIC FEATURES AND THE MAGNETIC FIELD ON THE SUN [PDF]
The Astrophysical Journal Letters, 2016 ABSTRACT Observations of the upper chromosphere show an enormous amount of intricate fine structure. Much of this comes in the form of linear features, which are most often assumed to be well aligned with the direction of the magnetic field in the low plasma β regime that is thought to dominate the upper chromosphere.
Juan Martínez-Sykora +3 more
openaire +2 more sources
On the Magnetic Nature of Quiet-Sun Chromospheric Grains
The Astrophysical Journal Letters, 2023 Abstract Ca ii K grains, i.e., intermittent, short-lived (about 1 minute), periodic (2–4 minutes), pointlike chromospheric brightenings, are considered to be the manifestations of acoustic waves propagating upward from the solar surface and developing into shocks in the chromosphere.
María Jesús Martínez González +4 more
openaire +2 more sources
, 2020 International audienceA fluid model is developed for multicomponent two-temperature magnetized plasmas in chemical non-equilibrium from the partially- to fully-ionized collisional regimes.
A. Alvarez Laguna +11 more
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