Results 31 to 40 of about 205 (182)

PROBING THE THERMODYNAMICS AND KINEMATICS OF SOLAR CORONAL STREAMERS

The Astrophysical Journal, 2011
We present the results of a resistive magnetohydrodynamic (MHD) model of an equatorially confined streamer belt using observational constraints for the heating and acceleration of the solar wind. To initiate the 2.5 dimensional MHD calculations, we used the Potential Field Source Surface model of the coronal magnetic field configuration with the ...
V. Airapetian, L. Ofman, E. C. Sittler, M. Kramar   +3 more
openaire   +1 more source

Modeling Solar Coronal Cavities in Streamers

, 2022
The solar corona is home to a variety of violent and dynamic events controlled by the coronal magnetic field, often termed “solar activity” (e.g., solar flares and coronal mass ejections [CMEs]). CMEs are often associated with the eruption of filaments embedded in the lobes of pseudostreamers or helmet streamers.
openaire   +1 more source

Evolution of coronal streamer structure during the rising phase of solar cycle 23 [PDF]

Geophysical Research Letters, 2000
White‐light images of the outer corona recorded with the Large Angle Spectrometric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) show a rapid widening of the streamer belt during 1998 and early 1999. The observed streamer structure and its evolution from rotation to rotation are reproduced with a model in which the Thomson ...
Y. ‐M. Wang, N. R. Sheeley, N. B. Rich
openaire   +1 more source

Blob formation and acceleration in the solar wind: role of converging flows and viscosity [PDF]

Annales Geophysicae, 2008
The effect of viscosity and of converging flows on the formation of blobs in the slow solar wind is analysed by means of resistive MHD simulations. The regions above coronal streamers where blobs are formed (Sheeley et al., 1997) are simulated using ...
G. Lapenta, G. Lapenta, A. L. Restante, A. L. Restante   +3 more
doaj   +1 more source

Effects of Coronal Magnetic Field Configuration on Particle Acceleration and Release during the Ground Level Enhancement Events in Solar Cycle 24

The Astrophysical Journal, 2023
Ground level enhancements (GLEs) are extreme solar energetic particle (SEP) events that are of particular importance in space weather. In solar cycle 24, two GLEs were recorded on 2012 May 17 (GLE 71) and 2017 September 10 (GLE 72), respectively, using a
Wenlong Liu, Xiangliang Kong, Fan Guo, Lulu Zhao, Shiwei Feng, Feiyu Yu, Zelong Jiang, Yao Chen, Joe Giacalone   +8 more
doaj   +1 more source

COCONUT, a Novel Fast-converging MHD Model for Solar Corona Simulations. III. Impact of the Preprocessing of the Magnetic Map on the Modeling of the Solar Cycle Activity and Comparison with Observations

The Astrophysical Journal, 2023
We developed a novel global coronal COCONUT (Coolfluid Corona Unstructured) model based on the COOLFluiD code. The steady-state model is predetermined by magnetograms set as boundary conditions, while inside the numerical domain the corona is described ...
Błażej Kuźma, Michaela Brchnelova, Barbara Perri, Tinatin Baratashvili, Fan Zhang, Andrea Lani, Stefaan Poedts   +6 more
doaj   +1 more source

Source regions of the slow solar wind in coronal streamers [PDF]

Geophysical Research Letters, 2000
Recent SOHO/UVCS observations of the O5+ ion line emission at 1032Å in coronal streamers indicate that the emission is stronger by an order of magnitude at the edges (legs) of streamers than in the central core of streamers. In contrast, the brightness of the Ly‐α emission peaks in the core of streamers.
openaire   +1 more source

An estimate of large‐scale solar wind density and velocity profiles in a coronal hole and the coronal streamer belt [PDF]

Journal of Geophysical Research: Space Physics, 1997
With the use of the total electron content data obtained by the Ulysses Solar Corona Experiment (SCE) during the first solar conjunction in summer 1991, two data sets were selected, one associated with a coronal hole and the other associated with coronal streamer belt crossings.
Martin Pätzold, Bruce T. Tsurutani, Michael K. Bird   +2 more
openaire   +1 more source

Determination of three‐dimensional structure of coronal streamers and relationship to the solar magnetic field [PDF]

Journal of Geophysical Research: Space Physics, 2001
We have determined the location, in three dimensions, of eight quasi‐stable coronal “streamers” from an analysis of Solar and Heliospheric Observatory (SOHO) Large‐Angle and Spectrometric Coronagraph images acquired over approximately one solar rotation. We use the locations to attempt to determine the solar origin of the streamers.
P. C. Liewer, J. R. Hall, M. De Jong, D. G. Socker, R. A. Howard, P. C. Crane, P. Reiser, N. Rich, A. Vourlidas   +8 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