Results 11 to 20 of about 150 (116)

The Solar Minimum Eclipse of 2019 July 2. III. Inferring the Coronal T e with a Radiative Differential Emission Measure Inversion

The Astrophysical Journal, 2023
Differential emission measure (DEM) inversion methods use the brightness of a set of emission lines to infer the line-of-sight (LOS) distribution of the electron temperature ( T _e ) in the corona.
Benjamin Boe, Cooper Downs, Shadia Habbal   +2 more
doaj   +1 more source

Lateral Confinement and the Remarkably Self-similar Nature of Coronal Pseudostreamer Mass Ejections

The Astrophysical Journal, 2023
Coronal mass ejections (CMEs) that originate from pseudostreamers, which separate coronal holes of the same magnetic polarity, are characterized by a narrow (∼5°–30°), fan-shaped appearance in white-light coronagraph images.
Y.-M. Wang, P. Hess
doaj   +1 more source

Recent insights on CME deflections at low heights

Frontiers in Astronomy and Space Sciences, 2023
It has been shown that the magnetic structures surrounding coronal mass ejection (CME) events play a crucial role in their development and evolution along the first few solar radii.
M. Cécere, M. Cécere, A. Costa, H. Cremades, G. Stenborg   +4 more
doaj   +1 more source

Morphology of Solar Type II Bursts Caused by Shock Propagation through Turbulent and Inhomogeneous Coronal Plasma

The Astrophysical Journal, 2023
Type II solar bursts are radio signatures of shock waves in the solar corona driven by solar flares or coronal mass ejections (CMEs). Therefore, these bursts present complex spectral morphologies in solar dynamic spectra.
Artem Koval, Aleksander Stanislavsky, Marian Karlický, Bing Wang, Serge Yerin, Aleksander Konovalenko, Miroslav Bárta   +6 more
doaj   +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

Periodic Variations in Visible Light Brightness as Tracers of Fine Coronal Structures

The Astrophysical Journal
The quiescent or dynamic nature of fine-scale raylike features in the Sun corona, observed in visible light, is still an open question. Here, we show that most of the daily and hourly periodic variations in visible light brightness of the high corona (up
Nathalia Alzate, Simone Di Matteo
doaj   +1 more source

Evidence of Continuous Reconnection along a Helmet Streamer Current Sheet Observed by WISPR on Parker Solar Probe

The Astrophysical Journal
Parker Solar Probe's second solar encounter from 2019 March 30 to April 11 occurred during a period when the corona had a simple magnetic structure and relatively flat heliospheric current sheet (HCS), which was in the field of view of the Wide-field ...
Paulett C. Liewer, Brendan M. Gallagher, Guillermo Stenborg, Mark G. Linton, Jiong Qiu, Angelos Vourlidas, Madison L. Ascione, Marco Velli   +7 more
doaj   +1 more source

Multispacecraft Observations of 2022 February 8 Prominence Cavity Eruption

The Astrophysical Journal
Helmet streamers are common structures that shape the corona at the largest scales, as observed in eclipse and white-light images. Helmet streamers overlie one cavity embedding a prominence channel and are surrounded by an open field of opposite-polarity
Nishu Karna, Mari Paz Miralles
doaj   +1 more source