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Observing the solar chromosphere [PDF]
, 2007 This review is split into two parts: one on chromospheric line formation in answer to the frequent question ``where is my line formed'', and one presenting state-of-the-art imagery of the chromosphere. In the first part I specifically treat the formation
Astrophysics +5 more
core +5 more sources
On the nature of the solar chromosphere
, 2006 DOT high-resolution imagery suggests that only internetwork-spanning Hα “mottles” constitute the quiet-Sun chromosphere, whereas more upright network “straws” in “hedge rows” reflect transition-region ...
Astrophysics +5 more
core +5 more sources
Wave Heating of the Solar Chromosphere [PDF]
, 2022 The solar chromosphere is well known to be in a radiative balance that requires an unac- counted source of heating. In this thesis I present observational constraints on the wave energy flux in the solar chromosphere, which is one of the favored ...
Molnar, Momchil Emil
core +4 more sources
Differential rotation: the chromosphere to the quiet chromosphere
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT Synoptic maps of Ca II K-normalized intensity at ±40° latitude belt from Carrington rotations 827 (1915 August 10) to 1764 (1985 July 7) are utilized to investigate the long-term variation of the quiet chromospheric differential rotation within solar activity cycles through removing some large values of Ca II-normalized ...
M Wan +5 more
openaire +1 more source
A CHROMOSPHERIC CONUNDRUM? [PDF]
The Astrophysical Journal, 2010 We examine spectra of the Ca II H line, obtained under good seeing conditions with the VTT Echelle Spectrograph in June of 2007, and higher resolution data of the Ca II 8542 Angstrom line from Fabry-Perot instruments. The VTT targets were areas near disk center which included quiet Sun and some dispersed plage.
Judge, Philip +3 more
openaire +2 more sources
Frontiers in Astronomy and Space Sciences, 2023 The flare activity of the Sun has been studied for decades, using both space- and ground-based telescopes. The former have mainly focused on the corona, while the latter have mostly been used to investigate the conditions in the chromosphere and ...
Alberto Sainz Dalda +4 more
doaj +1 more source
Incoherent Solar Radio Emission
Frontiers in Astronomy and Space Sciences, 2020 Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions.
Alexander Nindos
doaj +1 more source
Dissipation of Magnetohydrodynamic Waves in the Solar Stratified Flux Tubes [PDF]
Iranian Journal of Astronomy and Astrophysics, 2023 Chromosphere is the second layer of the Sun with high variability. The increase of the temperature and the decrease of the density are observed in this layer. This unusual behavior is one of the most important problems in the solar corona.
Zahra Fazel
doaj +1 more source
Investigating the Origin of the First Ionization Potential Effect With a Shell Turbulence Model
Frontiers in Astronomy and Space Sciences, 2021 The enrichment of coronal loops and the slow solar wind with elements that have low First Ionization Potential, known as the FIP effect, has often been interpreted as the tracer of a common origin.
Victor Réville +6 more
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Structure of the Solar Atmosphere: A Radio Perspective
Frontiers in Astronomy and Space Sciences, 2020 Solar radio emission has been providing information about the Sun for over half a century. In order to fully exploit this information, one needs to have a broader view of the solar atmosphere, which cannot be provided by radio observations alone.
Costas E. Alissandrakis
doaj +1 more source