The properties and dynamics of magnetic fields on the Sun’s photosphere and outer layers – notably those within solar active regions – govern the eruptive activity of the Sun. These photospheric magnetic fields also act as the evolving lower boundary of the Sun-Earth coupled system. Quantifying the physical attributes of these magnetic fields and exploring the mechanisms underlying their influe...

Coronal mass ejections (CMEs) are the largest-scale eruptive phenomena in solar system. Associated with enormous plasma and energy release, CMEs have an important impact on solar-terrestrial environment. Accurate predictions of arrival times at Earth depend precise measurements their three-dimensional velocities, which can be achieved using simultaneous line-of-sight (LOS) plane-of-sky (POS) ob...

Abstract Type II radio bursts are often associated with coronal shocks that typically driven by mass ejections (CMEs) from the Sun. Here we conduct a case study of type burst is C4.5-class flare and blowout jet, but without presence CME. The jet observed near solar disk center in extreme-ultraviolet (EUV) passbands different characteristic temperatures. Its evolution involves an initial phase e...

We present the first observations of nonthermal decimetric burst emission of the Sun using the new 400 cm (74 MHz) system at the VLA. Our VLA observations were carried out in collaboration with the Large Angle Spectroscopic Coronagraph (LASCO) and the Extreme-Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory spacecraft. Full-disk observations at 400 and 91 cm w...

[1] The purpose of this paper is to investigate the statistical properties of high‐speed coronal mass ejections (fast CMEs), which play a major role in Space Weather. We study the cumulative distribution of the initial CME speeds applying a new, advanced statistical method based on the scaling properties of averages of maximal speeds selected in time intervals of fixed sizes. This method allows...

The focus is on the physical background and comprehension of origin heliospheric propagation interplanetary coronal mass ejections (ICMEs), which can cause most severe geomagnetic disturbances. paper considers mainly analytical modelling, providing useful insight into nature ICMEs, complementary to that provided by numerical MHD models. It concentrated processes related CMEs at Sun, their propa...

Q1 The numerical study of axisymmetric force-free magnetic fields in the unbounded space outside a unit sphere, presented in the first paper of this series, is extended to treat twisted fields in static equilibrium with plasma pressure andweight in a polytropic atmosphere. The study considers dipolar magnetic fields all sharing the same boundary flux distribution on the unit sphere and characte...

We revisit the school choice problem with consent proposed by Kesten (2010), which seeks to improve the efficiency of the student-optimal deferred acceptance algorithm (DA) by obtaining students’ consent to give up their priorities. We observe that for students to consent, we should use their consent only when their assignments are Pareto unimprovable. Inspired by this perspective, we propose a...

In 2000–2001 Ulysses passed from the south to the north polar regions of the Sun in the inner heliosphere, providing a snapshot of the latitudinal structure of cosmic ray modulation and solar energetic particle populations during a period near solar maximum. Observations from the COSPIN suite of energetic charged particle telescopes show that latitude variations in the cosmic ray intensity in t...

On 2005 September 13 a filament eruption accompanied by a halo CME occurred in the most flare-productive active region NOAA 10808 in Solar Cycle 23. Using multi-wavelength observations before the filament eruption on Sep. 13th, we investigate the processes leading to the catastrophic eruption. We find that the filament slowly ascended at a speed of 0.1km s over two days before the eruption. Dur...