Results 111 to 120 of about 1,455,996 (195)

A Data-constrained Analysis for Joule Heating as a Solar Active Region Atmosphere Heating Mechanism. I. Sunspot Umbral Light Bridge

The Astrophysical Journal
Understanding the mechanisms underlying the heating of the solar atmosphere is a fundamental problem in solar physics. The lower atmosphere of the Sun (i.e., photosphere and chromosphere) is composed of weakly ionized plasma.
M. S. Yalim, M. Frisse, C. Beck, D. P. Choudhary, A. Prasad, S. S. Nayak, G. P. Zank   +6 more
doaj   +1 more source

Multifluid and Kinetic 2D and 3D Simulations of Thermal Farley–Buneman Instability Turbulence in the Solar Chromosphere

The Astrophysical Journal
Models currently fail to reproduce observations of the coldest regions in the Sun’s atmosphere, though recent work suggests the thermal Farley–Buneman instability (TFBI) may play a critical role.
Samuel Evans, Meers Oppenheim, Juan Martínez-Sykora, Yakov Dimant   +3 more
doaj   +1 more source

Interactions between Fast Downflows and Fan-shaped Jets above a Penumbral Light Bridge using the Goode Solar Telescope

The Astrophysical Journal
We present the analysis of high-resolution H α observations of fan-shaped jets above a penumbral light bridge (LB) subject to external disturbance through fast downflows in active region (AR) 12683 using data from the Goode Solar Telescope and the ...
Kristina Brocklebank, Erwin Verwichte, Juie Shetye   +2 more
doaj   +1 more source

How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?

The Astrophysical Journal
Abstract The corona is a structure possessed by stars, including the Sun. The abnormal heating of the solar corona and chromosphere is one of the greatest mysteries in modern astronomy. While state-of-the-art observations have identified some candidates of magnetic activity events that could be responsible for this abnormal heating, and ...
K. J. Li, J. C. Xu, W. Feng, J. L. Xie, X. J. Shi, L. H. Deng   +5 more
openaire   +3 more sources

Multi-thermal dynamics and transverse oscillations of solar spicules revealed by coordinated SST, IRIS, and SDO observations

Astronomy & Astrophysics
Context. Solar spicules are highly dynamic chromospheric jets that play an important role in the mass and energy balance of the solar atmosphere, even though their connection to the transition region and corona remains unclear. Aims.
Chaurasiya Ravi, Pereira Tiago M. D., Bayanna Ankala Raja   +2 more
doaj   +1 more source

Magnetohydrodynamic Poynting Flux Vortices in the Solar Atmosphere and Their Role in Concentrating Energy

The Astrophysical Journal
The nature of energy generation, transport, and effective dissipation responsible for maintaining a hot solar upper atmosphere is still elusive. The Poynting flux is a vital parameter for describing the direction and magnitude of the energy flow, which ...
Suzana S. A. Silva, Gary Verth, Erico L. Rempel, Istvan Ballai, Shahin Jafarzadeh, Viktor Fedun   +5 more
doaj   +1 more source

Temporal Evolution of a Network Jet’s Physical Properties Inferred from FISS/GST and IRIS Observations

The Astrophysical Journal
Small-scale jets, such as chromospheric and transition region (TR) network jets, are of great interest regarding coronal heating and solar wind acceleration. Spectroscopic analysis based on multiple spectral lines with different formation temperatures is
Eun-Kyung Lim, Jongchul Chae, Kyuhyoun Cho, Vasyl Yurchyshyn, Heesu Yang, Kyung-Suk Cho, Hannah Kwak, Donguk Song, Maria S. Madjarska   +8 more
doaj   +1 more source

Measuring the magnetic fields in the chromospheres of low-mass stars. [PDF]

Nat Commun
Cang T, Petit P, Donati JF, Tian H, Fu J, Li H, Bellotti S, Hu X, Ma X, Lopez Ariste A, Xing K, Morin J, Lu H, Zong W.   +13 more
europepmc   +2 more sources

Sequential Magnetic Reconnections in a Fishbone-like Structure Leading to Recurrent Brightenings

The Astrophysical Journal Letters
The fine-scale release of magnetic free energy in the solar atmosphere is a fundamental open question in solar physics. Multiwavelength observations at high spatiotemporal resolution now offer a direct window into this process.
Bo Yang, Jiayan Yang, Junchao Hong, Yi Bi   +3 more
doaj   +1 more source

Vortex Motions in the Solar Atmosphere: Definitions, Theory, Observations, and Modelling. [PDF]

Space Sci Rev, 2023
Tziotziou K, Scullion E, Shelyag S, Steiner O, Khomenko E, Tsiropoula G, Canivete Cuissa JR, Wedemeyer S, Kontogiannis I, Yadav N, Kitiashvili IN, Skirvin SJ, Dakanalis I, Kosovichev AG, Fedun V.   +14 more
europepmc   +1 more source