Results 11 to 20 of about 881 (218)
Atmospheric heating in solar flares by chromospheric condensation
Astrophysical Journal, 1994 More and more observational and theoretical evidence has shown the existence of a chromospheric condensation during solar flares. Can such a chromospheric condensation play a role in the energy process of the chromospheric flare? In this paper, we have empirically studied the influence of the chromospheric condensation on the distribution of the ...
Weiqun Gan, P J D Mauas
exaly +2 more sources
Alfvén Wave Heating of Solar Chromosphere Reexamined
The Astrophysical JournalModels of heating the weakly ionized solar atmosphere by collisional damping of upward-propagating Alfvén waves, calculated under the assumption that only incompressible (intermediate-mode) MHD waves are involved, have predicted heating rates that do not
Vytenis M. Vasyliūnas
doaj +2 more sources
Constraining magnetic heating in the solar chromosphere
, 2022 The chromospheric and coronal heating problems remain one of the foremost open questions in solar and stellar physics: how are the outer layers of the Sun heated from a few thousand kelvin in the photosphere to the million-degree corona?
Morosin, Roberta
core +2 more sources
The Astrophysical Journal, 2023 High-resolution spectral observations of the lower solar atmosphere (chromosphere and transition region) during coronal heating events, in combination with predictions from models of impulsively heated loops, provide powerful diagnostics of the ...
Paola Testa +3 more
doaj +1 more source
Heating of the quiet solar chromosphere [PDF]
Solar Physics, 1994 We have analyzed a large number of Caii H line profiles at the sites of the bright points in the interior of the network using a 35-min-long time sequence of spectra obtained at the Vacuum Tower Telescope (VTT) of the Sacramento Peak Observatory on a quiet regon of the solar disc and studied the dynamical processes associated with these structures. Our
Kariyappa, R. +2 more
openaire +2 more sources
OBSERVING THE ROOTS OF SOLAR CORONAL HEATING—IN THE CHROMOSPHERE [PDF]
The Astrophysical Journal, 2009 14 pages, 5 figures, accepted for publication in ApJ ...
De Pontieu, Bart +3 more
openaire +2 more sources
Geoscience Data Journal, Volume 10, Issue 1, Page 158-177, January 2023., 2023 The importance of scientific data and historical heritage of the Geophysical and Astronomical Observatory of Coimbra University for the study of geophysical sciences. Abstract The Geophysical and Astronomical Observatory of the University of Coimbra (OGAUC) was officially created in 2013 after merging of two historical institutions: the Astronomical ...
Ana Gomes +3 more
wiley +1 more source
Astronomische Nachrichten, Volume 343, Issue 5, June 2022., 2022 Abstract The strong chromospheric absorption lines Ca ii H & K are tightly connected to stellar surface magnetic fields. Only for the Sun, spectral activity indices can be related to evolving magnetic features on the solar disk. The Solar Disk‐Integrated (SDI) telescope feeds the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) of the ...
Ekaterina Dineva +6 more
wiley +1 more source
The harsh environment where exoplanets live
Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022 Abstract The X‐ray and Extreme Ultraviolet (XUV) actvity of the Sun has determined important effects on the planets around it. In particular, high doses of X‐rays, flares, and coronal mass ejections (CMEs) combined with masses and sizes of the planets and the shielding action of the planetary magnetic fields have determined the diverse habitability of ...
Ignazio Pillitteri
wiley +1 more source
Coronal mass ejections and exoplanets: A numerical perspective
Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022 Abstract Coronal mass ejections (CMEs) are more energetic than any other class of solar phenomena. They arise from the rapid release of up to erg of magnetic energy mainly in the form of particle acceleration and bulk plasma motion. Their stellar counterparts, presumably involving much larger energies, are expected to play a fundamental role in shaping
Julián D. Alvarado‐Gómez +5 more
wiley +1 more source