Results 81 to 90 of about 43,284 (218)

Understanding the Duration of Solar and Stellar Flares at Various Wavelengths

The Astrophysical Journal, 2023
Recent irradiance measurements from numerous heliophysics and astrophysics missions including Solar Dynamics Observatory (SDO), GOES, Kepler, TESS, Chandra, the X-ray Multi-Mirror Mission, and NICER have provided critical input into understanding the ...
Jeffrey W. Reep, Vladimir S. Airapetian
doaj   +1 more source

Slow-Mode Oscillations and Damping of Hot Solar Coronal Loops [PDF]

, 2012
The effect of temperature inhomogeneity on the periods, their ratios (fundamental versus first overtone), and the damping times of the standing slow modes in gravitationally stratified solar coronal loops are studied.
A. Abedini, H. Safari, S. Nasiri
semanticscholar   +1 more source

MMS Observations of the Energetic Particles Within Kelvin‐Helmholtz Waves at the Boundary of the 10 May 2024 Coronal Mass Ejection (CME)

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract On 10 May 2024, Earth was hit by a CME that drove the largest geomagnetic storm in 20 years. Multi‐spacecraft observations previously showed that the ∼100 nT north‐south IMF bz ${b}_{z}$ variation was driven by Kelvin‐Helmholtz waves with wavelength ∼250 RE ${R}_{E}$ and reconnection jets in the ±z $\pm z$‐direction (Nykyri, 2024a, https://doi.
Katariina Nykyri, Neetasha Arya, Scott Boardsen, Guan Le, Harri Laakso, Lynn Wilson, Xuanye Ma, Katherine Holland, Brandon Burkholder, Leon Ofman, Kyoung‐Joo Hwang, Dinesh Radhakrishnan, Shiva Kavosi, Daniel Gershman, Christine Gabrielse, Barbara Giles, Stephen Fuselier, Jim Burch   +17 more
wiley   +1 more source

Entropy-mode Imprints in the Solar Corona: Nonexponential Damping and Phase Shifts of Compressive Oscillations

The Astrophysical Journal Letters
Magnetohydrodynamic waves in coronal loops provide key seismological diagnostics through their characteristic time signatures. While fast and slow magnetoacoustic modes are routinely exploited, the entropy mode, despite being another eigenmode of the ...
Dmitrii Kolotkov, Sergey Belov, Mohamed Sherif   +2 more
doaj   +1 more source

The UK Met Office’s Coronal Mass Ejection (CME) Ensemble Prediction System

Space Weather, Volume 24, Issue 7, July 2026.
Abstract We describe the 24‐member Coronal Mass Ejection (CME) ensemble prediction system that is used operationally at the UK's Met Office Space Weather Operations Center (MOSWOC) to forecast the arrival time of CMEs at Earth. The ensemble system was built on ad‐hoc assumptions and there is the need to investigate whether the technique can be improved
Siegfried Gonzi, D. R. Jackson, F.‐X. Bocquet, V. J. Pizzo, E. Adamson, G. Millward, A. R. Marble, D. Odstrcil, C. N. Arge   +8 more
wiley   +1 more source

Transverse oscillations in solar coronal loops induced by propagating Alfvénic pulses [PDF]

, 2004
The propagation and the evolution of Alfvenic pulses in the solar coronal arcades is investigated by means of MHD numerical simulations. Significant transverse oscillations in coronal loops, triggered by nearby flare events, are often measured in EUV ...
L. Zanna, Eveline Schaekens, M. Velli
semanticscholar   +1 more source

Soft Proton Environment Modeling for SMILE Using XGBoost and Solar Cycle–Informed Synthetic Data Sets

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Soft proton contamination presents a persistent threat to the performance of space‐based X‐ray observatories such as ESA's upcoming Solar‐wind Magnetosphere Ionosphere Link Explorer (SMILE). This study develops a machine‐learning framework for modeling soft proton fluxes in the 92.2–159.7 keV range, tailored to SMILE's elliptical, highly ...
Simon Mischel, Elena A. Kronberg, C. P. Escoubet   +2 more
wiley   +1 more source

A New Model of Cutoff Latitude for Solar Energetic Protons Based on the Partial Least Squares Method

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Solar energetic particle (SEP) events can cause space weather hazards, especially at high altitudes and in the polar regions. Therefore, it is important to determine the boundaries that SEPs with different energies/rigidities can access and impact. In this work, we develop a new model of cutoff latitude for solar energetic protons covering the
Zhenghao She, Hui Zhu, Qian Song, Yao Chen, Yingying Zhao, Huicong Chen, Zhijie Qin   +6 more
wiley   +1 more source

Two Distinctly Different Characteristics of Flare-driven Coronal Rain Revealed from High-resolution Spectroscopic Imaging Observations with FISS/GST

The Astrophysical Journal
We report on a flare-driven coronal rain event observed along postflare loops during the decay phase of an X1.6-class solar flare. Although high-resolution studies of flare-driven coronal rain have been conducted, imaging spectroscopic studies are rare ...
Donguk Song, Eun-Kyung Lim, Jongchul Chae, Maria S. Madjarska, Masahito Kubo, Hannah Kwak, Juhyung Kang, Ryohtaroh T. Ishikawa, Kyoung-Sun Lee   +8 more
doaj   +1 more source

Plasma Stability in Turbulent Magnetic Flux Ropes Downstream of a Collisionless Shock

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract How pre‐existing solar wind turbulence, and coherent structures such as magnetic flux ropes within it, influence the transition of plasma across a shock is still poorly understood. Recently, in situ observations from the Earth's magnetosheath have been used to study plasma stability against ion kinetic instabilities. In the turbulent flow, the
L. Vuorinen, D. Burgess, F. Koller, D. Trotta   +3 more
wiley   +1 more source