Results 111 to 120 of about 14,964 (204)

Observing the Solar Chromosphere

open access: yes, 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 of the Na D lines, Ca II H & K, and Halpha.
openaire   +4 more sources

What Happens in “Chromospheres”?

open access: yesStem Cells Translational Medicine, 2013
The recent paper by Santana et al. titled “Isolation, Characterization, and Differentiation of Progenitor Cells From Adult Human Adrenal Medulla” [1] is an interesting contribution to human chromaffin cell biology. However, I am concerned about omissions of important information in the literature that could lead to alternate interpretations of the ...
openaire   +2 more sources

The Bright Rim Prominences according to 2.5D Radiative Transfer

open access: yesThe Astrophysical Journal Letters
Solar prominences observed close to the limb commonly include a bright feature that, from the perspective of the observer, runs along the interface between itself and the underlying chromosphere. Despite several idealized models being proposed to explain
Jack M. Jenkins   +4 more
doaj   +1 more source

Chromospheric Flares

open access: yes, 2007
In this topical review I revisit the "chromospheric flare." This should currently be an outdated concept, because modern data seem to rule out the possiblity of a major flare happening independently in the chromosphere alone, but the chromosphere still plays a major observational role in many ways.
openaire   +2 more sources

Magnetic Fields beneath Active Region Coronal Loops

open access: yesThe Astrophysical Journal
We examine the hypothesis that multipolar magnetic fields advected by photospheric granules can contribute to heating the active chromosphere and corona.
Philip G. Judge, L. Kleint, C. Kuckein
doaj   +1 more source

Vortex Motions in the Solar Atmosphere: Definitions, Theory, Observations, and Modelling. [PDF]

open access: yesSpace Sci Rev, 2023
Tziotziou K   +14 more
europepmc   +1 more source

Determining the Magnetic Field of Active Region Plages Using the Whole CLASP2/2.1 Spectral Window

open access: yesThe Astrophysical Journal
The Chromospheric LAyer SpectroPolarimeter missions, CLASP2 and CLASP2.1, demonstrated that the near-UV spectral region between 279.30 and 280.68 nm is suitable for studying the magnetism of the solar chromosphere.
David Afonso Delgado   +18 more
doaj   +1 more source

Solar Flare Ribbon Fronts. II. Evolution of Heating Rates in Individual Flare Footpoints

open access: yesThe Astrophysical Journal
Solar flare ribbon fronts appear ahead of the bright structures that normally characterize solar flares, and can persist for an extended period of time in spatially localized patches before transitioning to “regular” bright ribbons. They likely represent
Graham S. Kerr   +3 more
doaj   +1 more source

Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field

open access: yesThe Astrophysical Journal
A proposed mechanism for solar chromospheric heating is magnetohydrodynamic waves propagating upward along magnetic field lines and dissipating their energy in the chromosphere.
Mayu Koyama, Toshifumi Shimizu
doaj   +1 more source

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