Results 31 to 40 of about 860 (182)

The Heating of Solar Coronal Loops by Alfvén Wave Turbulence [PDF]

The Astrophysical Journal, 2017
Abstract In this paper we further develop a model for the heating of coronal loops by Alfvén wave turbulence (AWT). The Alfvén waves are assumed to be launched from a collection of kilogauss flux tubes in the photosphere at the two ends of the loop.
A. A. van Ballegooijen, M. Asgari-Targhi, A. Voss   +2 more
openaire   +4 more sources

Universal Time Influence on Stormtime Magnetosphere Ionosphere Coupling

AGU Advances, Volume 7, Issue 2, April 2026.
Abstract The offset between Earth's magnetic and rotational axes introduces a diurnal dependence in the high‐latitude EUV exposure of the northern hemisphere (NH) and southern hemisphere (SH). This variation raises the question: Does the Universal Time (UT) of geomagnetic storm onset impact its geospace consequences?
Kalpesh Ghag, William Lotko, Kevin Pham, Dong Lin, Viacheslav Merkin, Anil Raghav, Michael Wiltberger   +6 more
wiley   +1 more source

Hyperdiffusion as a Mechanism for Solar Coronal Heating [PDF]

The Astrophysical Journal, 2008
9 pages (emulateapj style), 4 figures, ApJ, in press (v. 679; June 1, 2008)
van Ballegooijen, A. A., Cranmer, S. R.
openaire   +2 more sources

Fully Kinetic Simulations of Ion‐Acoustic Waves in Asymmetric Reconnection With Cold Ions

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract In collisionless plasma, ion‐acoustic wave (IAW) is an important candidate for enhancing resistivity and viscosity, yet their presence and role in magnetic reconnection remain poorly understood. Here, we employ 2.5‐D particle‐in‐cell simulations to investigate IAWs in asymmetric magnetopause reconnection involving a cold ion population ...
Liangjin Song, Meng Zhou, Liang Wang, Zhihong Zhong, Xinmin Li, Chuanfei Dong, Chuanpeng Hou, Rongxin Tang, Yongyuan Yi, Xiaohua Deng   +9 more
wiley   +1 more source

Simulating the Solar Corona with Multiple Solar Photospheric Magnetic Maps during the 2024 April 8 Total Solar Eclipse

The Astrophysical Journal
The 2024 April 8 total solar eclipse provides a unique opportunity to study the solar corona. This work presents our simulations of the solar corona at the time of the eclipse based on magnetohydrodynamic modeling performed with the Alfvén Wave Solar ...
Xianyu Liu, Weihao Liu, Ward B. Manchester IV, Daniel T. Welling, Gábor Tóth, Tamas I. Gombosi, Marc L. DeRosa, Luca Bertello, Alexei A. Pevtsov, Alexander A. Pevtsov, Kevin Reardon, Kathryn Wilbanks, Amy Rewoldt, Lulu Zhao   +13 more
doaj   +1 more source

SYNTHETIC SOLAR CORONAL HEATING ON CURRENT SHEETS

The Astrophysical Journal, 2009
Synthetic heating of solar coronal loops combining Joule and wave-heating mechanisms on current sheets is proposed. The formation of singular current structures such as current sheets can be caused not only by magnetic reconnection and footpoint convection of coronal loops, but also Alfv?n resonance induced by shear flows.
Xiao-Gang Wang, Li-Wen Ren, Jia-Qi Wang, Chi-Jie Xiao   +3 more
openaire   +1 more source

On the Freeze‐In Distance of Solar Wind Fluid Entropy Variability in the Corona

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract The strong correlation between solar wind entropy and the frozen‐in ion charge state ratio O7+/O6+ ${\mathrm{O}}^{7+}/{\mathrm{O}}^{6+}$ indicates that entropy variability on timescales of hours or longer is preserved from its solar source. This prompts the question: where in the solar atmosphere does this entropy variability come from, and at
Aidan J. Nakhleh, Nicholeen M. Viall, Susan T. Lepri, Jim M. Raines   +3 more
wiley   +1 more source

Phase-space Analysis of Ordered and Disordered Nonthermal Ion Energization during Magnetic Reconnection

The Astrophysical Journal, 2023
Anomalous ion heating is frequently observed to accompany magnetic reconnection, yet there is little consensus on its origin. Instead of the usual velocity-space analysis, we use phase-space analysis to exhaustively explain how ions are nonthermally ...
Young Dae Yoon, Paul M. Bellan, Gunsu S. Yun   +2 more
doaj   +1 more source

Solar coronal heating by magnetic cancellation - III. Thermodynamics [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
We present two-dimensional numerical magnetohydrodynamics simulations of a coronal X-ray bright point (XBP) caused by a cancelling magnetic feature (CMF). Cancellation is driven by converging motions of two magnetic bipolar sources. These sources are initially disconnected from each other so that both, the CMF and the associated reconnection/heating ...
B. von Rekowski, A. W. Hood
openaire   +1 more source

Compression of Mercury's Dayside Magnetopause to the Surface: A Three‐Dimensional Model of Magnetospheric Structure and Dynamics

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract We apply a hybrid model (kinetic ions, fluid electrons) to provide context for MErcury Surface Space ENvironment, GEochemistry, and Ranging (MESSENGER) observations of Disappearing Dayside Magnetosphere (DDM) events at Mercury. Such events have been observed on four occasions and are caused by Coronal Mass Ejections completely removing the ...
Georg Glebe, C. Michael Haynes, Sven Simon   +2 more
wiley   +1 more source