Results 11 to 20 of about 1,347 (224)
Research progress in coronal magnetic field measurements
地球与行星物理论评, 2022 Different solar atmospheric layers are connected by the magnetic field of the Sun, which is the primary source for various types of solar activity. The magnetic activity of the Sun has a significant impact on the solar-terrestrial environment and human ...
Zihao Yang +6 more
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Estimating Ion Temperatures at the Polar Coronal Hole Boundary
The Astrophysical Journal, 2023 The temperatures of the heavy ions ( T _i ) in the solar corona provide critical information about the heating mechanism of the million-degree corona.
Yingjie Zhu, Judit Szente, Enrico Landi
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First Infrared Coronal Spectra from DKIST/Cryo-NIRSP: Comparisons with Global MHD Models
The Astrophysical Journal, 2023 The Cryogenic Near-Infrared Spectropolarimeter (Cryo-NIRSP) is now conducting science operations at the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST).
Thomas A. Schad +6 more
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Coronal spectral diagnostics: The coronal solar magnetism observatory (COSMO)
Frontiers in Astronomy and Space Sciences, 2022 The Need: Understanding and predicting the major phenomena taking place in the solar corona, such as flares and Coronal Mass Ejections (CMEs), the heating and evolution of the solar atmosphere, and the acceleration of the solar wind, are fundamental ...
Enrico Landi +9 more
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Are Nonthermal Velocities in Active Region Coronal Loops Anisotropic?
The Astrophysical Journal, 2023 We have measured line widths in active region coronal loops in order to determine whether the nonthermal broadening is anisotropic with respect to the magnetic field direction. These nonthermal velocities are caused by unresolved fluid motions.
Michael Hahn +2 more
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CAII lines in a quiet region on the Sun I. Dynamic processes in the solar atmosphere
Solar-Terrestrial Physics, 2023 We have studied oscillation processes in the quiet Sun outside a coronal hole at different levels of the solar chromosphere. The study was based on spectroscopic observations of ionized calcium lines (K, H, and 849.8 nm) obtained by the Sayan Solar ...
Turova I. P. +2 more
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Solar Coronal Fe XVII X-Ray Line Ratios [PDF]
International Astronomical Union Colloquium, 1984 The SOLEX bragg crystal spectrometer experiment on the P78-1 satellite (Landecker, McKenzie and Rugge, 1979) has been used to determine accurate flux ratios of several strong solar Fe XVII x-ray emission lines in the ~ 15 to ~ 17 Å wavelength region.
H.R. Rugge, D.L. McKenzie
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ON THE NATURE OF THE SPECTRAL LINE BROADENING IN SOLAR CORONAL DIMMINGS [PDF]
The Astrophysical Journal, 2011 We analyze the profiles of iron emission lines observed in solar coronal dimmings associated with coronal mass ejections, using the EUV Imaging Spectrometer on board Hinode. We quantify line profile distortions with empirical coefficients (asymmetry and peakedness) that compare the fitted Gaussian to the data. We find that the apparent line broadenings
Dolla, Laurent R., Zhukov, Andrei N.
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Characteristics of the Solar Coronal Line Profiles from Fabry–Perot Interferometric Observations [PDF]
Solar Physics, 2019 This article reports the analysis of a set of Fabry-Perot interferograms that were studied to probe the physical parameters of the inner solar corona. The observations were carried out in the coronal green line, Fe XIV 5302.86 , during the total solar eclipse of 21 June 2001 which occurred in Lusaka, Zambia.
Maya Prabhakar +2 more
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On the solar coronal lines 1175-1965 A
The Astrophysical Journal, 1979 Sixteen new coronal lines are observed in ATM UV spectra. Identifications, wavelengths, and intensities are presented. Two additional lines observed previously are proposed as transitions within the 3p(3)3d configuration of Fe XI.
G. D. Sandlin, R. Tousey
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