Results 91 to 100 of about 16,413 (221)

The FIP and Inverse FIP Effects in Solar and Stellar Coronae

Living Reviews in Solar Physics, 2015
We review our state of knowledge of coronal element abundance anomalies in the Sun and stars. We concentrate on the first ionization potential (FIP) effect observed in the solar corona and slow-speed wind, and in the coronae of solar-like dwarf stars ...
J. Martin Laming
doaj   +1 more source

Properties of ion-cyclotron waves in the open solar corona

, 2012
Remote observations of coronal holes have strongly implicated the resonant interactions of ion-cyclotron waves with ions as a principal mechanism for plasma heating and acceleration of the fast solar wind.
Mecheri, R.
core   +1 more source

Assessing Magnetic Fluctuations Effects in the South American Sector in Relation to Global Variations Using Ksa Index, Kp Index, and Hybrid Formats During Quiet Times Across the Seasons of the 2020 Solar Minimum

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract Geomagnetic indices can be used to quantify variations in geomagnetic activity caused by Sun‐Earth interactions across the magnetosphere and ionosphere. The global Kp index is widely used as a global geomagnetic indicator, but it is based mostly on the Northern Hemisphere with no contributions from South American observatories.
L. M. Guizelli, C. M. Denardini, J. Moro, L. C. A. Resende, S. S. Chen, P. K. Nyassor   +5 more
wiley   +1 more source

Modeling the Propagation of Slow Magnetoacoustic Waves in a Multistranded Coronal Loop

The Astrophysical Journal
We study the propagation properties of slow magnetoacoustic waves in a multithermal coronal loop using a 3D MHD model, for the first time. A bundle of 33 vertical cylinders, each of 100 km radius, randomly distributed over a circular region of radius 1 ...
S. Krishna Prasad, T. Van Doorsselaere
doaj   +1 more source

Magneto-seismology of solar atmospheric loops by means of longitudinal oscillations

, 2012
There is increasingly strong observational evidence that slow magnetoacoustic modes arise in the solar atmosphere. Solar magneto-seismology is a novel tool to derive otherwise directly un-measurable properties of the solar atmosphere when ...
Dymova, G. Verth, M. Luna-Cardozo, R. Erdélyi, Verth   +4 more
core   +1 more source

Statistical Characteristics of Electron Precipitation During HSS‐ and ICME‐Driven Storms Observed by the EISCAT Radar

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The 1–100 keV electron precipitation during storm time has been studied by applying the updated ELSPEC inversion method to field‐aligned electron density profiles measured by the EISCAT Tromsø radar at L = 6.5. The statistical properties of peak energy, total energy flux, and total number flux as a function of MLT have been studied for the two
N. M. Ellahouny, A. T. Aikio, I. I. Virtanen, H. Vanhamäki, L. Cai, M. N. Pedersen, H. W. Tesfaw   +6 more
wiley   +1 more source

Solar Stereoscopy and Tomography

Living Reviews in Solar Physics, 2011
We review stereoscopic and tomographic methods used in the solar corona, including ground-based and space-based measurements, using solar rotation or multiple spacecraft vantage points, in particular from the STEREO mission during 2007--2010 ...
Markus J. Aschwanden
doaj  

Broad and Bidirectional Narrow Quasiperiodic Fast-propagating Wave Trains Associated with a Filament-driven Halo Coronal Mass Ejection on 2023 April 21

The Astrophysical Journal
This paper presents three distinct wave trains that occurred on 2023 April 21: a broad quasiperiodic fast-propagating (QFP) wave train and bidirectional narrow QFP wave trains.
Xinping Zhou, Yuandeng Shen, Yihua Yan, Ke Yu, Zhining Qu, Ahmed Ahmed Ibrahim, Zehao Tang, Chengrui Zhou, Song Tan, Ye Qiu, Hongfei Liang   +10 more
doaj   +1 more source

Solar Wind Acceleration by Solitary Waves in Coronal Holes

The Astrophysical Journal, 1997
Coronal holes are well-known sources of the high-speed solar wind; however, the exact acceleration mechanism of the fast wind is still unknown. We solve numerically the time-dependent, nonlinear, resistive 2.5-dimensional MHD equations and find that solitary waves are generated in coronal holes nonlinearly by torsional Alfven waves.
L. Ofman, J. M. Davila
openaire   +1 more source

Poleward Disturbances in Thermospheric Winds During the 3–4 November 2021 Geomagnetic Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract This study focuses on ionosphere‐thermosphere coupling over North America during the 3–4 November 2021 strong geomagnetic storm (Kp 8−). We comprehensively analyze storm‐time ionospheric and thermospheric disturbances using data from ground‐based instruments at Poker Flat, Millstone Hill, and Urbana, as well as satellite observations and model
Jonna Wehmeyer, Yoshihiro Tomikawa, Takanori Nishiyama, Yasunobu Ogawa, Eframir Franco‐Diaz   +4 more
wiley   +1 more source