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Determination of projection effects of CMEs using quadrature observations with the two STEREO spacecraft

Bronarska, K.; Michalek, G.

Since 1995 coronal mass ejections (CMEs) have been routinely observed thanks to the sensitive Large Angle and Spectrometric Coronagraphs (LASCO) on board the Solar and Heliospheric Observatory (SOHO) mission. Their observed characteristics are stored, among other, in the SOHO/LASCO catalog. These parameters are commonly used in scientific studies.…

Solar flares, CMEs and solar energetic particle events during solar cycle 24

Pande, Bimal; Pande, Seema; Chandra, Ramesh +1 more

We present here a study of Solar Energetic Particle Events (SEPs) associated with solar flares during 2010-2014 in solar cycle 24. We have selected the flare events (≥GOES M-class), which produced SEPs. The SEPs are classified into three categories i.e. weak (proton intensity ≤ 1 pfu), minor (1 pfu < proton intensity < 10 pfu) and major (pro…

Properties and relationship between solar eruptive flares and Coronal Mass Ejections during rising phase of Solar Cycles 23 and 24

Moon, Y. -J.; Shanmugaraju, A.; Umapathy, S. +2 more

Statistical relationship between major flares and the associated CMEs during rising phases of Solar Cycles 23 and 24 are studied. Totally more than 6000 and 10,000 CMEs were observed by SOHO/LASCO (Solar and Heliospheric Observatory/Large Angle Spectrometric Coronagraph) during 23rd [May 1996-June 2002] and 24th [December 2008-December 2014] solar…

A study of a long duration B9 flare-CME event and associated shock

Srivastava, A. K.; Chandra, R.; Chen, P. F. +2 more

We present and discuss here the observations of a small long duration GOES B-class flare associated with a quiescent filament eruption, a global EUV wave and a CME on 2011 May 11. The event was well observed by the Solar Dynamics Observatory (SDO), GONG H α , STEREO and Culgoora spectrograph. As the filament erupted, ahead of the filament we obser…

A statistical study of CME-Preflare associated events

Youssef, M.; Mawad, Ramy

We investigated the relationship of associated CME-Preflare during the solar period 1996-2010. We found 292 CME-Preflare associated events (∼2%). Those associated events have 0-1 h interval time, popular events occur within half an hour before flare starting time. Post-flares-CME associated events are wider than CME-Preflare associated events. CME…

CME productivity associated with Solar Flare peak X-ray emission flux

Suryanarayana, G. S.; Balakrishna, K. M.

It is often noticed that the occurrence rate of Coronal Mass Ejections (CMEs) increases with increase in flare duration where peak flux too increase. However, there is no complete association between the duration and peak flux. Distinct characteristics have been reported for active regions (ARs) where flares and CMEs occur in contrast to ARs where…