Abstract Accurately forecasting the arrival of coronal mass ejections (CMEs) at Earth is important to enabling mitigation associated space weather risks society. This only possible with accurate modeling event. To do so, we must understand propagation a CME through heliosphere and quantify performance models comparison spacecraft observations. For 12 December 2008 Earth‐directed event, compute ...

After providing an overview of solar activity as measured by the sunspot number (SSN) and space weather events during cycles (SCs) 21-24, we focus on weak in SC 24. The reduces energetic eruptions from Sun hence events. speeds coronal mass ejections (CMEs), interplanetary (IP) shocks, background wind all declined One main heliospheric consequences is reduced total (magnetic + gas) pressure, mag...

Aims. We aim to constrain the acceleration, injection, and transport processes of flare-accelerated energetic electrons by comparing their characteristics at Sun with those injected into interplanetary space. Methods. have identified 17 electron events well-observed SEPT instrument aboard STEREO which show a clear association hard X-ray (HXR) flare observed RHESSI spacecraft. compare spectral i...

The origin of the Moreton wave observed in the chromosphere and the EIT wave observed in the corona during the eruption remains being an active research subject for a while. We investigate numerically in this work the evolutionary features of the magnetic configuration that includes a current-carrying flux rope, which is used to model the filament, after the loss of equilibrium in the system ta...

Aims.We aim to locate the origin of a stealth coronal mass ejection (CME) detected in situ by MAG instrument on board Solar Orbiter, and make connections between CME observed at Sun, interplanetary (ICME) measured situ. Methods. Remote sensing data are analysed using advanced image processing techniques identify source region CME, global magnetic field time eruption is examined Potential Field ...

Recent work by the authors has produced a new phenomelogical forward model for coronal mass ejections (CMEs). This model, called the Tappin-Howard (TH) Model, takes advantage of the breakdown of geometrical linearity when CMEs are observed by white-light imagers at large distances from the Sun. The TH Model extracts three-dimensional structure and kinematic information on the CME using white li...

[1] We report on the development of an Automatic Coronal Mass Ejection (CME) Detection tool (AICMED) for the Solar Mass Ejection Imager (SMEI). CMEs observed with heliospheric imagers are much more difficult to detect than those observed by coronagraphs as they have a lower contrast compared with the background light, have a larger range of intensity variation and are easily confused with other...

Abstract With more than 4300 confirmed exoplanets and counting, the next milestone in exoplanet research is to determine which of these newly found worlds could harbor life. Coronal mass ejections (CMEs), spawned by magnetically active, superflare-triggering dwarf stars, pose a direct threat habitability terrestrial exoplanets, as they can deprive them their atmospheres. Here we develop readily...

Abstract We investigate the source eruption, propagation and expansion characteristics, heliospheric impacts of 2020 November 29 coronal mass ejection (CME) associated shock, using remote sensing in situ observations from multiple spacecraft. A potential-field source-surface model is employed to examine magnetic fields surrounding region. The CME shock are tracked early stage outer corona extre...

Coronal Mass Ejections (CMEs) drive space weather activity at Earth and throughout the solar system. Current CME-related predictions rely on information reconstructed from coronagraphs, sometimes only a single viewpoint, to simple interplanetary propagation model, which gives arrival time or limited additional information. We present coupling of three established models into OSPREI (Open Solar ...