Results 11 to 20 of about 2,412 (205)
Determination of Differential Emission Measure from Solar Extreme Ultraviolet Images [PDF]
Astrophysical Journal Letters, 2018 Abstract The Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observatory (SDO) has been providing high-cadence, high-resolution, full-disk UV-visible/extreme ultraviolet (EUV) images since 2010, with the best time coverage among all the solar missions.
Yang Su, Astrid M Veronig, I G Hannah
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Extreme ultraviolet emission lines of Ni XII in laboratory and solar spectra [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 Wavelengths for emission lines arising from 3s23p5-3s3p6 and 3s23p5-3s23p43d transitions in Ni XII have been measured in extreme ultraviolet spectra of the Joint European Torus(JET) tokamak. The 3s23p5 2P1/2-3s23p4(3P)3d 2D3/2 line is found to lie at 152.90 ± 0.02 A, a significant improvement over the previous experimental determination of 152.95 ± 0.5
F P Keenan, G J J Botha, K D Lawson
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Asymmetries of solar coronal extreme ultraviolet emission lines [PDF]
Astronomy and Astrophysics, 2010 Astronomy & Astrophysics (accepted), 17 pages, 13 ...
H Peter
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Astrophysical Journal, 2022 Abstract The hydrogen Lyα (H i Lyα) emission during solar flares has rarely been studied in spatially resolved images, and its physical origin has not been fully understood. In this paper, we present novel Lyα images for a C1.4 solar flare (SOL2021-08-20T22:00) from the Extreme Ultraviolet Imager aboard Solar Orbiter, together with multi-
Qiao Li +2 more
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The solar corona above active regions: A comparison of extreme ultraviolet line emission with radio emission [PDF]
Solar Physics, 1967 The observations of extreme ultraviolet (EUV) emission lines of Feix through Fe XVI made by OSO-I have been applied to a study of the solar corona above active regions. Ultraviolet and radio emission are determined for several levels of activity classified according to the type of sunspot group associated with the active region. Both radio emission and
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TWO COMPONENTS OF THE SOLAR CORONAL EMISSION REVEALED BY EXTREME-ULTRAVIOLET SPECTROSCOPIC OBSERVATIONS [PDF]
Astrophysical Journal, 2011 Recent spectroscopic observations have revealed the ubiquitous presence of blueward asymmetries of emission lines formed in the solar corona and transition region. These asymmetries are most prominent in loop footpoint regions, where a clear correlation of the asymmetry with the Doppler shift and line width determined from the single-Gaussian fit is ...
Hui Tian +2 more
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Modeling solar extreme ultraviolet irradiance variability using emission measure distributions
Geophysical Research Letters, 1996 We introduce a new model of solar irradiance variability at extreme ultraviolet (EUV) wavelengths. The model combines a spectral emission line database, solar emission measure distributions, and estimates from ground‐based solar images of the fraction of the Sun covered by the various types of activity to synthesize the irradiance.
H P Warren, J T Mariska
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Hydrostatic Modeling of the Integrated Soft X‐Ray and Extreme Ultraviolet Emission in Solar Active Regions [PDF]
Astrophysical Journal, 2006 Many studies of the solar corona have shown that the observed X-ray luminosity is well correlated with the total unsigned magnetic flux. In this paper we present results from the extensive numerical modeling of active regions observed with the Solar and Heliospheric Observatory (SOHO) EUV Imaging Telescope (EIT), the Yohkoh Soft X-Ray Telescope (SXT ...
Harry P Warren, Amy R Winebarger
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Astrophysical Journal, 1998 We have developed a new method for the reconstruction of differential emission measure distributions based on a Metropolis Markov-chain Monte Carlo (MCMC[M]) method. This technique allows us to (1) relax nonphysical smoothness constraints generally imposed on DEMs, (2) determine confidence bounds on the computed values, and (3) include extra ...
Vinay L Kashyap
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Solar Emission Lines in the Extreme Ultraviolet.
Astrophysical Journal, 1959 T. Violett, William A. Rense
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