Results 1 to 10 of about 285 (167)
On the Minimum Temperature of the Quiet Solar Chromosphere [PDF]
Astronomy and Astrophysics, 2011 10 pages, 12 figures, accepted for A& ...
Mats Carlsson +2 more
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On the Origin of the Magnetic Energy in the Quiet Solar Chromosphere [PDF]
Astrophysical Journal, 2019 Abstract The presence of magnetic field is crucial in the transport of energy through the solar atmosphere. Recent ground-based and space-borne observations of the quiet Sun have revealed that magnetic field accumulates at photospheric heights, via a local dynamo or from small-scale flux emergence events.
Mats Carlsson +2 more
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Height and Dynamics of the Quiet Solar Chromosphere at the Limb [PDF]
Astronomy and Astrophysics, 2001 In this paper we present observations of He I 1083.0 nm, He D 3 587.6 nm and H β 486.1 nm taken at various positions at the solar limb. We determine and compare the emission of the lines in terms of line-parameters. The height of the chromosphere as seen in the helium lines varies in space and time and reaches values between 1100 and 1800 km above ...
K Muglach
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Spectroscopic Detection of Alfvénic Waves in the Chromospheric Fibrils of a Solar-quiet Region
The Astrophysical Journal, 2023 We report the detection of transverse magnetohydrodynamic waves, also known as Alfvénic waves, in the chromospheric fibrils of a solar-quiet region.
Hannah Kwak +5 more
doaj +2 more sources
Scattering Polarization of the Ca Ii IR Triplet for Probing the Quiet Solar Chromosphere [PDF]
Astrophysical Journal, 2010 The chromosphere of the quiet Sun is an important stellar atmospheric region whose thermal and magnetic structure we need to decipher for unlocking new discoveries in solar and stellar physics. To this end, we must identify and exploit observables sensitive to weak magnetic fields (B<100 G) and to the presence of cool and hot gas in the bulk of the ...
R Manso Sainz, J Trujillo Bueno
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Heating and Dynamics of the Quiet Solar Chromosphere [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractThe quiet solar chromosphere in regions with negligible magnetic field is believed to be heated by acoustic waves. But their energy flux, measured in the upper photosphere with the Transition Region And Coronal Explorer (TRACE), has been found to be insufficient to account for the radiative emission from the chromosphere. Wedemeyer-Böhm et al. (
exaly +2 more sources
Reversal-Free Ca II H Profiles: A Challenge for Solar Chromosphere Modeling in Quiet Inter-Network [PDF]
Astronomy and Astrophysics, 2008 We study chromospheric emission to understand the temperature stratification in the solar chromosphere. We observed the intensity profile of the CaIIH line in a quiet Sun region close to the disk center at the German Vacuum Tower Telescope. We analyze over 10^5 line profiles from inter-network regions.
Christian Beck +2 more
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Monthly Notices of the Royal Astronomical SocietyABSTRACT The full-disc chromosphere was routinely monitored in the He i 10 830 Å line at the National Solar Observatory/Kitt Peak from 2004 November to 2013 March, and thereby, synoptic maps of He i line intensity from Carrington rotations 2032 to 2135 were acquired.
Jing-Chen Xu, K J Li
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SUMER Observations Confirm the Dynamic Nature of the Quiet Solar Outer Atmosphere: The Internetwork Chromosphere [PDF]
Astrophysical Journal, 1997 On 12 March 1996 we obtained observations of the quiet Sun with the SUMER instrument. The observa- tions were sequences of 15-20 second exposures of ultraviolet emission line profiles and of the neighboring continua. These data contain signatures of the dynamics of the solar chromosphere that are uniquely useful because of wavelength coverage, moderate
Mats Carlsson, K Wilhelm
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High-Resolution Microwave Observations of the Quiet Solar Chromosphere
Astrophysical Journal, 1996 The VLA was used to observe a quiet region of the Sun on 1992 September 23 at 1.3 and 2 cm. Unlike previous interferometric microwave observations of the quiet Sun, we have used the total power data to calibrate the brightness temperature distribution in an absolute sense.
G A Dulk, T S Bastian
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