Results 1 to 10 of about 14,709 (209)

Relevant heating of the quiet solar corona by Alfvén waves: a result of adiabaticity breakdown. [PDF]

Sci Rep, 2019
AbstractIon heating by Alfvén waves has been considered for long as the mechanism explaining why the solar corona has a temperature several orders of magnitude higher than the photosphere. Unfortunately, as the measured wave frequencies are much smaller than the ion cyclotron frequency, particles were expected to behave adiabatically, impeding a direct
Escande DF, Gondret V, Sattin F.
europepmc   +5 more sources

Source Region of the Solar Wind: Statistics of the Doppler Velocities at the Chromosphere

The Astrophysical Journal Letters
The solar wind has been extensively studied recently with in situ observations, and the understanding of its counterpart near the solar surface has also progressed significantly.
Fu Yu, Shihao Rao, Jie Zhao, Chuan Li, Yang Su, Jinsong Zhao, Ye Qiu, Mingde Ding, Cheng Fang, Hui Li, Weiqun Gan   +10 more
doaj   +1 more source

What Determines the Brightness of the Magnetically Open Solar Corona?: Insights from Three-dimensional Radiative Magnetohydrodynamic Simulations and Observations

The Astrophysical Journal
We investigate the relationship between solar coronal holes and open-field regions using three-dimensional radiative magnetohydrodynamic simulations combined with remote-sensing observations from the Solar Dynamics Observatory (SDO).
Haruhisa Iijima
doaj   +1 more source

3D MHD Simulations of Coronal Loops Heated via Magnetic Braiding. I. Continuous Driving

The Astrophysical Journal
The nature and detailed properties of the heating of the million-degree solar corona are important issues that are still largely unresolved. Nanoflare heating might be dominant in active regions and quiet Sun, although direct signatures of such small ...
G. Cozzo, Paola Testa, J. Martinez-Sykora, F. Reale, P. Pagano, F. Rappazzo, V. Hansteen, B. De Pontieu, A. Petralia, E. Alaimo, F. Fiorentino, F. D’Anca, L. Sciortino, M. Todaro, U. Lo Cicero, M. Barbera   +15 more
doaj   +1 more source

The role and contribution of magnetic fields, characterized via their magnetic flux, to the statistical structuring of the solar atmosphere. [PDF]

Sci Rep, 2022
Li KJ, Xu JC, Feng W.
europepmc   +1 more source

A Unified Picture of Swirl-driven Solar Coronal Heating: Magnetic Energy Supply and Dissipation

The Astrophysical Journal Letters
The coronal heating problem is one of the most critical challenges in solar physics. Recent observations have revealed that small-scale swirls are ubiquitous in the photosphere and chromosphere, suggesting that they may play a significant role in ...
Hidetaka Kuniyoshi, Shinsuke Imada, Takaaki Yokoyama   +2 more
doaj   +1 more source

Defining the Middle Corona. [PDF]

Sol Phys, 2023
West MJ, Seaton DB, Wexler DB, Raymond JC, Del Zanna G, Rivera YJ, Kobelski AR, Chen B, DeForest C, Golub L, Caspi A, Gilly CR, Kooi JE, Meyer KA, Alterman BL, Alzate N, Andretta V, Auchère F, Banerjee D, Berghmans D, Chamberlin P, Chitta LP, Downs C, Giordano S, Harra L, Higginson A, Howard RA, Kumar P, Mason E, Mason JP, Morton RJ, Nykyri K, Patel R, Rachmeler L, Reardon KP, Reeves KK, Savage S, Thompson BJ, Van Kooten SJ, Viall NM, Vourlidas A, Zhukov AN.   +41 more
europepmc   +1 more source

Study on the relation of the solar coronal rotation with magnetic field structures. [PDF]

Sci Rep, 2023
Xiang NB, Zhao XH, Deng LH, Li FY, Zheng S.   +4 more
europepmc   +1 more source

The SWAP Filter: A Simple Azimuthally Varying Radial Filter for Wide-Field EUV Solar Images. [PDF]

Sol Phys, 2023
Seaton DB, Berghmans D, Bloomfield DS, De Groof A, D'Huys E, Nicula B, Rachmeler LA, West MJ.   +7 more
europepmc   +1 more source

A Survey of Current Operations-Ready Thermospheric Density Models for Drag Modeling in LEO Operations. [PDF]

J Astronaut Sci
Mutschler S, Pilinski M, Bruinsma S, Sutton E, Tobiska WK, Knipp D, Fang TW, Casali S, Mallik V, DiLorenzo B, Siemes C.   +10 more
europepmc   +1 more source