Results 41 to 50 of about 16,769 (212)

Connecting the Sun and the Solar Wind: The First 2.5 Dimensional Self-consistent MHD Simulation under the Alfv\'en Wave Scenario

, 2012
The solar wind emanates from the hot and tenuous solar corona. Earlier studies using 1.5 dimensional simulations show that Alfv\'{e}n waves generated in the photosphere play an important role in coronal heating through the process of non-linear mode ...
Antolin, Banerjee, Bogdan, Cranmer, Dmitruk, Einaudi, Esser, Fedun, Hasan, Heyvaerts, Kudoh, Lamy, Matsumoto, Matsumoto, Matthaeus, Nishizuka, Okamoto, Perez, Steiner, Suzuki, Takeru Ken Suzuki, Takuma Matsumoto, Teriaca, Tsuneta, Van Ballegooijen, Verdini, Wilhelm, Yokoyama, Zangrilli   +28 more
core   +1 more source

Dominance of Bursty over Steady Heating of the 4–8 MK Coronal Plasma in a Solar Active Region: Quantification Using Maps of Minimum, Maximum, and Average Brightness

The Astrophysical Journal, 2022
A challenge in characterizing active region (AR) coronal heating is in separating transient (bursty) loop heating from the diffuse background (steady) heating.
Sanjiv K. Tiwari, Lucy A. Wilkerson, Navdeep K. Panesar, Ronald L. Moore, Amy R. Winebarger   +4 more
doaj   +1 more source

Dynamics of Magnetic Flux Elements in the Solar Photosphere [PDF]

, 1998
The interaction of magnetic fields and convection is investigated in the context of the coronal heating problem. We study the motions of photospheric magnetic elements using filtergrams obtained at the Swedish Vacuum Solar Telescope at La Palma.
A. A. van Ballegooijen, A. Nordlund, Chapman G. A., Dunn R. B., Glencross W. M., Heyvaerts J., Kano R., M. G. Lofdahl, Muller R., Narain U., Narain U., P. Nisenson, R. F. Stein, R. W. Noyes, Schmidt H. U., Solanki S., Spruit H. C., V. Krishnakumar, von der Luhe O.   +18 more
core   +3 more sources

Heating solar coronal holes

The Astrophysical Journal, 1991
It has been shown that the coronal hole, and the associated high-speed stream in the solar wind, are powered by a heat input of the order of 500,000 ergs/sq cm s, with most of the heat injected in the first 1-2 solar radii, and perhaps 100,000 ergs/sq cm s introduced at distances of several solar radii to provide the high speed of the issuing solar ...
openaire   +1 more source

Machine Learning for Local Detection of Separators in Three‐Dimensional Magnetic Fields

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Magnetic reconnection is a major plasma phenomenon occurring in various key environments ranging from the Sun and near‐Earth space to astrophysical plasmas. While magnetic reconnection is relatively well‐understood under two‐dimensional (2D) settings, it remains challenging to characterize in three‐dimensional (3D) magnetic fields.
Fanni Franssila, Markku Alho, Ioanna Bouri, Daniel Holmberg, Minna Palmroth, Teemu Roos   +5 more
wiley   +1 more source

Multi-scale energy release events in the quiet Sun: a possible source for coronal heating

Frontiers in Astronomy and Space Sciences
The coronal heating problem remains one of the most challenging questions in solar physics. The energy driving coronal heating is widely understood to be associated with convective motions below the photosphere. Recent high-resolution observations reveal
Rui Wang, Rui Wang, Yiming Jiao, Yiming Jiao, Xiaowei Zhao, Chong Huang   +5 more
doaj   +1 more source

On active region loops: Hinode/EIS observations

, 2008
Coronal loops are fundamental building blocks of the solar active regions and the corona. Therefore, a clear understanding of the physics of coronal loops will help us understand the physics of active region heating in particular and coronal heating in ...
Antolin, Arnaud, Aschwanden, Bhola N. Dwivedi, Cargill, Cirtain, Dammasch, Del Zanna, Del Zanna, Dere, Doschek, Durgesh Tripathi, Feldman, Giulio Del Zanna, Hara, Harra, Helen E. Mason, Landi, Marsch, Patsourakos, Peter, Peter R. Young, Schmelz, Schmelz, Teriaca, Tripathi, Tripathi, Warren, Young, Young   +29 more
core   +1 more source

Magnetopause Boundary Layers in Low Mach CME‐Driven Storm Environment

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Magnetopause boundary layers (BLs) play an important role mediating plasma and energy exchange between the solar wind/magnetosheath and Earth's magnetosphere. Energy exchange across the magnetopause is enhanced during storms, yet little work has been done investigating BLs during storms.
Rachel C. Rice, Li‐Jen Chen, Tai Phan, Brandon L. Burkholder, Stephen A. Fuselier, Roman Gomez, Cristian P. Ferradas, Jason M. H. Beedle, Megha Pandya   +8 more
wiley   +1 more source

The Equilibrium of Coronal Loops Near Separatrices

The Astrophysical Journal, 2023
We present numerical models from the field-aligned HYDrodynamics and RADiation code (HYDRAD) of a highly asymmetric closed coronal loop with near-singular expansion factor.
Emily I Mason, Spiro K Antiochos, Stephen Bradshaw   +2 more
doaj   +1 more source

Physical properties of solar polar jets: A statistical study with Hinode XRT data

, 2015
The target of this work is to investigate the physical nature of polar jets in the solar corona and their possible contribution to coronal heating and solar wind flow based on the analysis of X-ray images acquired by the Hinode XRT telescope. We estimate
Bemporad, A., Paraschiv, A. R., Sterling, A. C.   +2 more
core   +1 more source