Results 61 to 70 of about 426 (204)

Mercury's Alfvén Wing Current System Under Sub‐Alfvénic Solar Wind Conditions: Insights From Global MHD Simulations

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Mercury's proximity to the Sun results in the lowest average Alfvénic Mach number in the upstream solar wind compared to any other planet. Under extreme conditions, the upstream Alfvén speed can exceed the solar wind speed, resulting in a sub‐Alfvénic interaction in which standing Alfvén wings form.
Charles F. Bowers, Xianzhe Jia
wiley   +1 more source

Mercury's Eccentric Orbit as a Driver of Significant “Seasonal” Change in Upstream Solar Wind Forcing

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Mercury experiences the most intense and variable solar wind (SW) conditions in the solar system due to its close, eccentric orbit about the Sun. In addition to variation driven by coronal source and solar cycle, the SW arriving at Mercury varies periodically as the planet's heliocentric distance changes by over 50% per orbit.
Ryan M. Dewey, Caitriona Mary Jackman, Mathias Rojo, Lina Z. Hadid, Beatriz Sánchez‐Cano, Charles F. Bowers, Jim M. Raines, Susan T. Lepri, Stefano Livi, Jesse T. Coburn, Sae Aizawa, Yeimy J. Rivera, Weijie Sun, Jiutong Zhao, James A. Slavin, Daniel Heyner, Daragh M. Hollman, Alexander D. Shane   +17 more
wiley   +1 more source

A 3D Nonequilibrium Ionization Model of a Shock Wave in the Low Corona. I. Extreme-ultraviolet Emission and Inefficient Electron Heating

The Astrophysical Journal
Shocks in the low corona are best observed in the extreme ultraviolet (EUV); however, time-dependent ionization in the postshock region is generally incompatible with the otherwise straightforward plasma diagnostics typically applied to EUV imaging data.
Nicolas Trueba, John C. Raymond, Cooper Downs, Susan T. Lepri, Katharine K. Reeves, Yeimy J. Rivera, Maurice L. Wilson, Chengcai Shen   +7 more
doaj   +1 more source

Revealing the Formation of the <20 MeV Inner Proton Radiation Belt at L ∼ 2 During the 10–11 May 2024 Superstorm

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract A new proton radiation belt was identified during the geomagnetic superstorm of 10–11 May 2024. To investigate its origin, we use an MHD‐test particle simulation to model solar energetic proton (SEP) trapping and the evolution of the initial trapped proton population during the storm.
Murong Qin, Mary K. Hudson, Miles Engel, Brian T. Kress, Zhao Li, Maulik Patel, Wen Li, Kevin Pham, William R. Johnston, Xinlin Li, Shawn Young   +10 more
wiley   +1 more source

Relationship between solar energetic particle intensities and coronal mass ejection kinematics using STEREO/SECCHI field of view [PDF]

, 2021
Solar energetic particles (SEPs) accelerated from shocks driven by coronal mass ejections (CMEs) are one of the major causes of geomagnetic storms on Earth. Therefore, it is necessary to predict the occurrence and intensity of such disturbances. For this
Michałek, Grzegorz, Ravishankar, Anitha, Grzegorz Michalek, Anitha Ravishankar   +3 more
core   +1 more source

Large-amplitude Whistler Precursors and >MeV Particles Observed at a Weak Interplanetary Shock by Parker Solar Probe

The Astrophysical Journal
We report observations of an interplanetary (IP) shock observed by Parker Solar Probe (PSP) on 2024 September 29 at ∼07:50:29 UTC. PSP was only ∼17.07 R _s from the Sun, making this one of the closest observed IP shocks to date. The IP shock was a weak (
Lynn B. Wilson III, J. Grant Mitchell, Adam Szabo, Immanuel C. Jebaraj, Michael L. Stevens, David M. Malaspina, Grant D. Berland, Athanasios Kouloumvakos, Stuart D. Bale, Roberto Livi, Jasper S. Halekas, Christina M. S. Cohen   +11 more
doaj   +1 more source

A Type II Radio Burst Driven by a Blowout Jet on the Sun

The Astrophysical Journal, 2023
Type II radio bursts are often associated with coronal shocks that are typically driven by coronal mass ejections (CMEs) from the Sun. Here we conduct a case study of a type II radio burst that is associated with a C4.5-class flare and a blowout jet, but
Zhenyong Hou, Hui Tian, Wei Su, Maria S. Madjarska, Hechao Chen, Ruisheng Zheng, Xianyong Bai, Yuanyong Deng   +7 more
doaj   +1 more source

Open Magnetic Field Lines Partition Auroral Oval Segments Into Transpolar Arcs

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Transpolar arcs (TPAs) are auroral structures spanning the polar cap. One type appears in conjugate hemispheres and is thought to be located on closed field lines, but how closed flux enters the open polar cap remains debated. We address this using observation and simulation of conjugate TPAs after an interplanetary magnetic field (IMF) By ...
Xin‐Ming Chen, Zan‐Yang Xing, Qing‐He Zhang, Hui‐Gen Yang, L. R. Lyons, K. Oksavik, Yong‐Liang Zhang, S. E. Milan, Xiang‐Yu Wang, Yu‐Zhang Ma, Yong Wang, Lu Sheng, Duan Zhang, Zhi‐Feng Xiu, Bian‐Long Zhao   +14 more
wiley   +1 more source

The Coupled Evolution of Electrons and Ions in Coronal Mass Ejection-driven shocks [PDF]

, 2012
We present simulations of coronal mass ejections (CMEs) performed with a new two-temperature coronal model developed at the University of Michigan, which is able to address the coupled thermodynamics of the electron and proton populations in the context ...
Tóth, G., van der Holst, Bart, Gombosi, Tamas I., Manchester, Ward B. IV   +3 more
core   +1 more source

Contribution of spicules to solar coronal emission [PDF]

, 2022
Recent high-resolution imaging and spectroscopic observations have generated renewed interest in spicules' role in explaining the hot corona. Some studies suggest that some spicules, often classified as type II, may provide significant mass and energy to
Sow Mondal, Shanwlee, Mondal, Shanwlee Sow, Sarkar, Aveek, Klimchuk, James A.   +3 more
core   +2 more sources