Results 71 to 80 of about 1,306 (183)

Evolution and decay of an active region: Magnetic shear, flare and CME activity [PDF]

Geofísica Internacional, 2000
An activity complex was observed on the solar disk between April, 1996 and February, 1997 that reached its highest level of activity during the birth of AR 7978.
P. Démoulin, S. Punkett, B. Thompson, L. van Driel-Gresztelyi, C. H. Mandrini, G. Aulanier   +5 more
doaj  

Two Distinctly Different Characteristics of Flare-driven Coronal Rain Revealed from High-resolution Spectroscopic Imaging Observations with FISS/GST

The Astrophysical Journal
We report on a flare-driven coronal rain event observed along postflare loops during the decay phase of an X1.6-class solar flare. Although high-resolution studies of flare-driven coronal rain have been conducted, imaging spectroscopic studies are rare ...
Donguk Song, Eun-Kyung Lim, Jongchul Chae, Maria S. Madjarska, Masahito Kubo, Hannah Kwak, Juhyung Kang, Ryohtaroh T. Ishikawa, Kyoung-Sun Lee   +8 more
doaj   +1 more source

Magnetic Connectivity in the Time-dependent Corona and Heliosphere

The Astrophysical Journal Letters
Magnetic flux fills the heliosphere, expands outward from the solar corona, and is fundamentally related to the structure and dynamics of the solar corona and solar wind.
Roberto Lionello, Cooper Downs, Emily I. Mason, Jon A. Linker, Pete Riley, Mathew J. Owens   +5 more
doaj   +1 more source

Near-Sun Characteristics of a CME Inferred from Observations in the 5303 Å Coronal Emission Line

The Astrophysical Journal
Using observations of the solar corona in the 5303 Å (Fe XIV ) emission line with the Visible Emission Line Coronagraph (VELC) on board Aditya-L1, we estimated the electron density ( N _e ), thermal energy ( E _CME ), and mass ( M _CME ) of a coronal ...
V. Muthu Priyal, R. Ramesh, Jagdev Singh, K. Sasikumar Raja, N. Gopalswamy   +4 more
doaj   +1 more source

Comprehensive Synthesis of Magnetic Tornado: Cospatial Incidence of Chromospheric Swirls and Extreme-ultraviolet Brightening

The Astrophysical Journal Letters
Magnetic tornadoes, characterized as impulsive Alfvén waves initiated by photospheric vortices in intergranular lanes, are considered efficient energy channels to the corona.
Hidetaka Kuniyoshi, Souvik Bose, Takaaki Yokoyama   +2 more
doaj   +1 more source

Analysis of the solar coronal green line profiles from eclipse observations

, 2013
Analysis of the solar coronal green line profiles reveals information regarding the physical conditions of the solar corona like temperature, density, Doppler velocity, non-thermal velocity etc. It provides insights to the unresolved problems like the coronal heating and the acceleration of the solar winds.
Prabhakar, Maya, Raju, K. P., Chandrasekhar, T.   +2 more
openaire   +2 more sources

Identifying Coronal Sources of L1 Solar Wind Disturbances Using the Fisk Heliospheric Magnetic Field and Potential Field Extrapolations during Three Solar Minima

The Astrophysical Journal
The solar minima between solar cycles 22–23, 23–24, and 24–25 are the best observed minima on record. In situ solar wind and interplanetary magnetic field measurements by the Wind and ACE spacecraft at L1 with 1 hr cadence are explored using wavelet ...
P. J. Steyn, D. Johnson, G. J. J. Botha, S. Régnier   +3 more
doaj   +1 more source

mxCSM: A 100-slit, 6-wavelength wide-field coronal spectropolarimeter for the study of the dynamics and the magnetic fields of the solar corona

Frontiers in Astronomy and Space Sciences, 2016
remendous progress has been made in the field of observational coronal magnetometry in the first decade of the 21st century. With the successful construction of the Coronal Multichannel Magnetometer (CoMP) instrument, observations of the linear ...
Haosheng eLin
doaj   +1 more source

New Near-infrared Coronal Lines Observed during the 2019 Total Solar Eclipse

The Astrophysical Journal
We report on a further analysis of the Airborne Infrared Spectrometer (AIR-Spec) observations from the 2019 July 2 total eclipse and present the identifications of three new coronal lines from Fe x , Si xi , and Si vi in AIR-Spec’s 1.87–1.99 μ m band ...
Jenna Samra, Giulio Del Zanna, Celeste Elizalde Flores, Chad Madsen, Edward DeLuca   +4 more
doaj   +1 more source

The emission-line spectrum above the limb of a solar coronal hole - 1175-1940 A

The Astrophysical Journal Supplement Series, 1976
Emission-line spectra of a coronal hole that coincided with the north pole of the sun are discussed which were obtained with a slit spectrograph aboard Skylab at positions within and above the solar white-light limb in the wavelength range from 1175 to 1940 A.
U. Feldman, G. A. Doschek, M. E. Vanhoosier, J. D. Purcell   +3 more
openaire   +1 more source