Results 111 to 120 of about 43,284 (218)

3D Reconstruction of Coronal Loops by the Principal Component Analysis

Entropy, 2013
Knowing the three dimensional structure of plasma filaments in the uppermost part of the solar atmosphere, known as coronal loops, and especially their length, is an important parameter in the wave-based diagnostics of this part of the Sun.
Erwin Verwichte, Valery M. Nakariakov, Giuseppe Nisticò   +2 more
doaj   +1 more source

Modeling Time-variable Elemental Abundances in Coronal Loop Simulations

The Astrophysical Journal Letters
Numerous recent X-ray observations of coronal loops in both active regions and solar flares have shown clearly that elemental abundances vary with time.
Jeffrey W. Reep, John Unverferth, Will T. Barnes, Sherry Chhabra   +3 more
doaj   +1 more source

Magnetic Waves In Solar Coronal Loops

, 2014
Final presentations of the Center for Astrophysics HEA/SSP Solar Summer Intern Program.
openaire   +1 more source

Catastrophic cooling in solar coronal loops

, 2005
thesis
openaire   +2 more sources

On the Existence of Long-period Decayless Oscillations in Short Active Region Loops

The Astrophysical Journal
Decayless kink oscillations, characterized by their lack of decay in amplitude, have been detected in coronal loops of varying scales in active regions, the quiet Sun, and coronal holes. Short-period (
Arpit Kumar Shrivastav, Vaibhav Pant, Rohan Kumar, David Berghmans, Tom Van Doorsselaere, Dipankar Banerjee, Elena Petrova, Daye Lim   +7 more
doaj   +1 more source

Spectroscopic Study of Heating Distributions and Mechanisms Using Hinode/EIS

The Astrophysical Journal
Heating distributions along coronal loops are obtained from spectroscopic data with the Hinode/EUV Imaging Spectrometer. The loop half-lengths L _half are in the range of 24–107 Mm for our analysis of 18 loops.
Shun Ishigami, Hirohisa Hara, Takayoshi Oba   +2 more
doaj   +1 more source

Understanding the Magnetic Field and Plasma-β along Umbral Fan Loops Traced Using 3 Minute Slow Waves

The Astrophysical Journal Letters
Plasma- β is an important fundamental physical quantity in solar plasma physics, which determines the dominating process in the solar atmosphere, i.e., magnetic or thermodynamic processes. Here, for the first time, we provide variations of magnetic field
Ananya Rawat, Girjesh Gupta, Tom Van Doorsselaere, S. Krishna Prasad, Robertus Erdélyi   +4 more
doaj   +1 more source

On the Connection of Coronal Loop Plasma with the Ambient Magnetic Field

The Astrophysical Journal Letters
Solar coronal loops are magnetically confined plasma structures whose properties are closely linked to the ambient magnetic field. Using 3D magnetohydrodynamic simulations of kink-unstable coronal flux tubes, we investigate how the intensity of the ...
F. Reale, G. Cozzo, P. Pagano, P. Testa
doaj   +1 more source

Multiple Episodes of Remote Brightenings Driven by a Coronal Extreme-ultraviolet Jet on the Sun

The Astrophysical Journal
Remote brightening (RB) is compact brightening at footpoints of magnetic loops, which are remotely connecting to and confining an eruption in the solar atmosphere.
Chao Zhang, Zhenghua Huang, Hengyuan Wei, Youqian Qi, Mijie Shi, Hui Fu, Xiuhui Zuo, Weixin Liu, Mingzhe Sun, Ming Xiong, Lidong Xia   +10 more
doaj   +1 more source

Spectroscopic Observations of Coronal Rain Formation and Evolution Following an X2 Solar Flare

The Astrophysical Journal
A significant impediment to solving the coronal heating problem is that we currently only observe active region loops in their cooling phase. Previous studies showed that the evolution of cooling loop densities and apex temperatures is insensitive to the
David H. Brooks, Jeffrey W. Reep, Ignacio Ugarte-Urra, John E. Unverferth, Harry P. Warren   +4 more
doaj   +1 more source