Solar energetic particles (SEPs) accelerated from shocks driven by coronal mass ejections (CMEs) are one of the major causes geomagnetic storms on Earth. Therefore, it is necessary to predict occurrence and intensity such disturbances. For this purpose we analyzed in detail 38 non-interacting halo partial CMEs, as seen Heliospheric Observatory/Large Angle Spectrometric Coronagraph, generating S...

The magnetic field topology at the coronal mass ejection (CME) source regions has been one of the major focuses of CME initiationmodels.While the ‘‘breakout’’ model requires a quadrupolar magnetic topology in the solar corona to enable an eruption, other models have shown that a bipolar magnetic topology can be the source region of a CME. In this paper, we use observational data and a potential...

The efficacy of coronal mass ejection (CME) observations as a key input to space weather forecasting is explored by comparing on and off Sun-Earth line from the ESA/NASA SOHO NASA STEREO spacecraft. A comparison made CME catalogues based L1 coronagraph imagery heliospheric imager (HI) observations, for year 2011. Analysis reveals inconsistencies in identification number potentially Earth-direct...

Abstract The culmination of solar cycle 24 by the end 2019 has created opportunity to compare differing properties coronal mass ejections (CMEs) between two whole cycles: 23 (SC 23) and 24). We report on width evolution limb CMEs in SCs order test suggestion Gopalswamy et al. that CME flux ropes attain pressure balance at larger heliocentric distances SC 24. measure as a function distance for s...

Halo coronal mass ejections (HCMEs) originating from regions close to the center of the Sun are likely to be responsible for severe geomagnetic storms. It is important to predict geo-effectiveness of HCMEs using observations when they are still near the Sun. Unfortunately, coronagraphic observations do not provide true speeds of CMEs due to the projection effects. In the present paper, we prese...

Abstract Homologous coronal mass ejections (CMEs) are an interesting phenomenon, and it is possible to investigate the formation of CMEs by comparing multi-CMEs under a homologous physical condition. AR 11283 had been present on solar surface for several days when bipole emerged 2011 September 4. Its positive polarity collided with preexisting negative belonging different bipole, producing recu...

Abstract Coronal mass ejections (CMEs) are a prominent contributor to solar system space weather and might have impacted the Sun’s early angular momentum evolution. A signal diagnostic of CMEs on Sun is coronal dimming: drop in emission, tied CME, that direct result removing emitting plasma from corona. We present results dimming analysis Fe xii 1349 Å xxi 1354 emission ? Eridani ( Eri), young ...

During solar minimum, the Sun is relatively inactive with few sunspots observed on surface. Consequently, we observe a smaller number of highly energetic events such as flares or coronal mass ejections (CMEs), which are often associated active regions photosphere. Nonetheless, our magnetofrictional simulations during minimum period suggest that corona still dynamically evolving in response to l...

Abstract The statistical study of the coronal mass ejections (CMEs) is a hot topic in solar physics. To further reveal temporal and spatial behaviors CMEs at different latitudes heights, we analyzed correlation phase relationships between occurrence rate CMEs, brightness index (CBI), 10.7 cm radio flux (F10.7). We found that correlates with CBI relatively stronger high (≥60°) than low (≤50°). A...

Context. The traditional cone models achieve great success in studying the geometrical and kinematic properties of halo coronal mass ejections (CMEs). Aims. In this Letter, a revised model is proposed to investigate CMEs as result non-radial prominence eruptions. Methods. apex located at source region an eruption instead Sun center. axis deviates from local vertical by inclination angle θ 1 ϕ ....