Results 11 to 20 of about 860 (219)
Identifying Plasma Fractionation Processes in the Chromosphere Using IRIS [PDF]
The Astrophysical JournalThe composition of the solar corona differs from that of the photosphere, with the plasma thought to fractionate in the solar chromosphere according to the first ionization potential (FIP) of the different elements.
David M. Long +9 more
doaj +6 more sources
The Astrophysical JournalWe report the first detection of a magnetic discontinuity in the upper solar chromosphere associated with a coronal loop brightening. Our findings are based on novel observations obtained by the Chromospheric LAyer SpectroPolarimeter (CLASP2.1 ...
Donguk Song +17 more
doaj +2 more sources
How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?
The Astrophysical JournalThe corona is a structure possessed by stars, including the Sun. The abnormal heating of the solar corona and chromosphere is one of the greatest mysteries in modern astronomy.
K. J. Li +5 more
doaj +2 more sources
The Astrophysical JournalAccurately assessing the balance between acoustic wave energy fluxes and radiative losses is critical for understanding how the solar chromosphere is thermally regulated.
J. M. da Silva Santos +5 more
doaj +3 more sources
The Astrophysical JournalWe determine magnetic fields from the photosphere to the upper chromosphere combining data from the Hinode satellite and the CLASP2.1 sounding rocket experiment.
Ryohko Ishikawa +19 more
doaj +2 more sources
The Astrophysical JournalThe physical processes in the solar corona that shape the solar wind remain an active research topic. Modeling efforts have shown that energy and plasma exchanges near the transition region play a crucial role in modulating solar wind properties ...
Paul Lomazzi +9 more
doaj +2 more sources
Extreme Red-wing Enhancements of UV Lines during the 2022 March 30 X1.3 Solar Flare
The Astrophysical Journal, 2023 Here, we present the study of a compact emission source during an X1.3 flare on 2022 March 30. Within a ∼41 s period (17:34:48 UT to 17:35:29 UT), Interface Region Imaging Spectrograph observations show spectral lines of Mg ii , C ii , and Si iv with ...
Yan Xu +5 more
doaj +1 more source
70 Years of Chromospheric Solar Activity and Dynamics
The Astrophysical Journal, 2020 Abstract From 1915 to 1985 the monitoring program of the Mount Wilson Observatory, one of the Observatories of the Carnegie Institution of Washington, has taken over 35,000 daily images (spectroheliograms) of the Sun in the chromospheric resonance line of Ca ii K.
Luca Bertello +2 more
openaire +1 more source
Monitoring fast solar chromospheric activity: the MeteoSpace project
Experimental Astronomy, 2022 We present in this reference paper an instrumental project dedicated to the monitoring of solar activity during solar cycle 25. It concerns the survey of fast evolving chromospheric events implied in Space Weather, such as flares, coronal mass ejections, filament instabilities and Moreton waves.
Malherbe, Jean-Marie +6 more
openaire +4 more sources
Chromospheric activities and kinematics for solar type dwarfs and subgiants: analysis of the activity distribution and the AVR [PDF]
Astronomy & Astrophysics, 2011 In this work we present chromospheric activity indices, kinematics, radial-velocities and rotational velocities for more than 850 FGK-type dwarfs and subgiant stars in the southern hemisphere and test how best to calibrate and measure S-indices from echelle spectra.
Jenkins, J. S. +8 more
openaire +13 more sources