Results 101 to 110 of about 16,482 (212)

Coronal Alfven waves and the solar wind [PDF]

The observed properties of coronal Alfven waves in the solar wind at 1 AU are briefly reviewed, with some theoretical discussion of their probable effects on the dynamics of the expanding solar corona. It is concluded that coronal Alfven waves can have a
Belcher, J. W.
core   +1 more source

Characterizing the Role of Storm‐Time High‐Latitude Ionospheric Structures in GPS Position Accuracy in Antarctica: May 2024 Storm

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigates the impact of high‐latitude ionospheric irregularities on global positioning system (GPS) position accuracy during the 10–11 May 2024 geomagnetic storm. Using data from ground‐based GPS receivers and an all‐sky camera in Antarctica, we examined evolution of GPS vertical total electron content, phase fluctuations, and ...
Waqar Younas, Yukitoshi Nishimura, Weixuan Liao, Josh L. Semeter, Sebastijan Mrak, Y. Jade Morton, Keith M. Groves, Tetsuo Motoba, Tim Everett   +8 more
wiley   +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

Solar coronal loop heating by cross-field wave transport

The Astrophysical Journal, 1989
Solar coronal arches heated by turbulent ion-cyclotron waves may suffer significant cross-field transport by these waves. Nonlinear processes fix the wave-propagation speed at about a tenth of the ion thermal velocity, which seems sufficient to spread heat from a central core into a large cool surrounding cocoon.
Peter Amendt, Gregory Benford
openaire   +1 more source

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

Diagnostics of the Coronal Hole and the adjacent Quiet Sun by The Hinode/EUV Imaging Spectrometer (EIS)

, 2014
A comparison between a Coronal Hole (CH) and the adjacent Quiet-Sun (QS) has been performed using spectroscopic diagnostics of Hinode/ the EUV Imaging Spectrometer (EIS).
Banerjee, D., Kayshap, P., Srivastava, A. K.   +2 more
core   +1 more source

Ion Charge States in the Fast Solar Wind: New Data Analysis and Theoretical Refinements

, 2007
We present a further investigation into the increased ionization observed in element charge states in the fast solar wind compared to its coronal hole source regions.
Hasegawa A., J. Martin Laming, Susan T. Lepri   +2 more
core   +1 more source

The Error Estimation of Transverse Coronal Loop Oscillation Parameters Based on Least Chi-squares Fitting

The Astrophysical Journal Supplement Series
Transverse oscillations of coronal loops not only influence coronal dynamics, but also provide a new perspective for coronal detection. To enhance their exploitation and utilization, accurately estimating the oscillation parameters is crucial.
Hongbo Li, Hengqiang Feng, Zhanjun Tian, Qiangwei Cai, Guoqing Zhao, Yan Zhao   +5 more
doaj   +1 more source

New analytical and numerical models of solar coronal loop: I. Application to forced vertical kink oscillations

, 2014
Aims. We construct a new analytical model of a solar coronal loop that is embedded in a gravitationally stratified and magnetically confined atmosphere. On the basis of this analytical model, we devise a numerical model of solar coronal loops.
Kraskiewicz, J., Murawski, K., Solov'ev, A., Srivastava, A. K.   +3 more
core   +1 more source

Alfven Wave Transmission and Heating of Solar Coronal Loops

The Astrophysical Journal, 1998
We discuss the problem of wave transmission from the solar photosphere into coronal loops. We conclude that wave energy can be efficiently transmitted into loops with a sufficiently twisted magnetic field. The value of the required twist is below but close to the threshold for kink instability.
C. Litwin, R. Rosner
openaire   +1 more source