Results 21 to 30 of about 150 (116)

Solar Stereoscopy and Tomography

Living Reviews in Solar Physics, 2011
We review stereoscopic and tomographic methods used in the solar corona, including ground-based and space-based measurements, using solar rotation or multiple spacecraft vantage points, in particular from the STEREO mission during 2007--2010 ...
Markus J. Aschwanden
doaj  

Origins of Very Low Helium Abundance Streams Detected in the Solar Wind Plasma

The Astrophysical Journal
The abundance of helium ( A _He ) in the solar wind exhibits variations typically in the range from 2% to 5% with respect to solar cycle activity and solar wind velocity. However, there are instances where the observed A _He is exceptionally low (
Yogesh, N. Gopalswamy, D. Chakrabarty, Parisa Mostafavi, Seiji Yashiro, Nandita Srivastava, Leon Ofman   +6 more
doaj   +1 more source

Understanding the Variability of Helium Abundance in the Solar Corona Using Three-fluid Modeling and Ultraviolet Observations

The Astrophysical Journal Letters
The variability of helium abundance in the solar corona and the solar wind is an important signature of solar activity, solar cycle, and solar wind sources, as well as coronal heating processes.
Leon Ofman, Yogesh, Silvio Giordano
doaj   +1 more source

The Properties of Small Magnetic Flux Ropes inside the Solar Wind Come from Coronal Holes, Active Regions, and Quiet Sun

The Astrophysical Journal, 2023
The origination and generation mechanisms of small magnetic flux ropes (SMFRs), which are important structures in solar wind, are not clearly known. In the present study, 1993 SMFRs immersed in coronal holes, active regions, and quiet-Sun solar wind are ...
Changhao Zhai, Hui Fu, Jiachen Si, Zhenghua Huang, Lidong Xia   +4 more
doaj   +1 more source

Implementation of a Near-real-time Recording and Reporting System of Solar Radio Bursts

The Astrophysical Journal
Strong solar activities are often accompanied by a variety of radio bursts. These radio bursts not only serve as valuable diagnostics of coronal and heliospheric processes but also as potential tools in space weather monitoring and forecasting.
Peijin Zhang, Anastasia Kuske, Bin Chen, Mengjia Xu, Gelu Nita, Marin M. Anderson, Judd D. Bowman, Ruby Byrne, Morgan Catha, Xingyao Chen, Sherry Chhabra, Larry D’Addario, Ivey Davis, Jayce Dowell, Katherine Elder, Dale Gary, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Jack Hickish, Rick Hobbs, David Hodge, Mark Hodges, Yuping Huang, Andrea Isella, Daniel C. Jacobs, Ghislain Kemby, John T. Klinefelter, Matthew Kolopanis, Nikita Kosogorov, James Lamb, Casey Law, Nivedita Mahesh, Surajit Mondal, Brian O’Donnell, Kathryn A. Plant, Corey Posner, Travis Powell, Vinand Prayag, Andres Rizo, Andrew Romero-Wolf, Jun Shi, Greg Taylor, Jordan Trim, Mike Virgin, Akshatha Vydula, Sandy Weinreb, Scott White, David Woody, Sijie Yu, Thomas Zentmeyer   +50 more
doaj   +1 more source

Measurements of the Perpendicular Correlation Length of Coronal Alfvénic Waves with DKIST

The Astrophysical Journal
We have measured the perpendicular correlation length L _⊥ of Alfvénic waves in the corona using data from the Daniel K. Inouye Solar Telescope (DKIST) Cryogenic Near Infrared Spectropolarimeter (Cryo-NIRSP) instrument.
Michael Hahn, Stefan J. Hofmeister, Alexandros Koukras, Daniel Wolf Savin   +3 more
doaj   +1 more source

Investigating the Behavior and Spatiotemporal Variations of Green-line Emission in the Solar Corona

The Astrophysical Journal Supplement Series
Understanding coronal structure and dynamics can be facilitated by analyzing green-line emission, which enables the investigation of diverse coronal structures such as coronal loops, streamers, coronal holes, and various eruptions in the solar atmosphere.
Jacob Oloketuyi, Yu Liu, Linhua Deng, Abouazza Elmhamdi, Fengrong Zhu, Ayodeji Ibitoye, Opeyemi Omole, Feiyang Sha, Qiang Liu   +8 more
doaj   +1 more source

Application of a Low-dissipation HLLD Approximate Riemann Solver to Solar Wind Simulations

The Astrophysical Journal
We investigate the steady-state solar wind in spherical coordinates using a low-dissipation Harten–Lax–van Leer-Discontinuities Riemann solver, in which the magnetic field is decomposed into an initial potential field B _0 and a time-dependent part B _1 .
Caixia Li, Zhenning Shen, Man Zhang, Xueshang Feng   +3 more
doaj   +1 more source

Spectroscopic Observations of the Solar Corona during the 2017 August 21 Total Solar Eclipse: Comparison of Spectral Line Widths and Doppler Shifts between Open and Closed Magnetic Structures

The Astrophysical Journal
The spectroscopic observations presented here were acquired during the 2017 August 21 total solar eclipse (TSE) with a three-channel partially multiplexed imaging spectrometer operating at extremely high orders (>50). The 4 R _⊙ extent of the slit in the
Yingjie Zhu, Shadia R. Habbal, Adalbert Ding, Bryan Yamashiro, Enrico Landi, Benjamin Boe, Sage Constantinou, Michael Nassir   +7 more
doaj   +1 more source

Revisiting magnetohydrodynamic modelling of the 2024 total solar eclipse with AI-reconstructed far-side photospheric field data

Astronomy & Astrophysics
Context. Total solar eclipses provide high-quality white-light observations of the solar corona. They also provide valuable reference data for validating global three-dimensional magnetohydrodynamic (MHD) coronal models driven by photospheric magnetic ...
Jeong H.-J., Poedts S., Wang H. P., Linan L., Baratashvili T., Condoluci M., Noraz Q., Lani A., Schmieder B.   +8 more
doaj   +1 more source