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Solar energetic particle events during the rise phases of solar cycles 23 and 24

Srivastava, A. K.; Chandra, R.; Gopalswamy, N. +13 more

We present a comparative study of the properties of coronal mass ejections (CMEs) and flares associated with the solar energetic particle (SEP) events in the rising phases of solar cycles (SC) 23 (1996-1998) (22 events) and 24 (2009-2011) (20 events), which are associated with type II radio bursts. Based on the SEP intensity, we divided the events…

CMEs and active regions on the sun

Yashiro, Seiji; Michalek, Grzegorz

The relationship between active regions (ARs) and coronal mass ejections (CMEs) is studied. For this purpose a statistical analysis of 694 CMEs associated with ARs was carried out. We considered the relationship between properties of the CMEs and ARs characterized using the McIntosh classification. We demonstrated that CMEs are likely to be launch…

A statistical study of post-flare-associated CME events

Youssef, M.; Mawad, R.; shaltout, Mosalam

We present a statistical study of post-flare-associated CMEs (PFA-CMEs) during the period from 1996 to 2010. By investigating all CMEs and X-ray flares, respectively, in the LASCO and GOES archives, we found 15875 CMEs of which masses are well measured and 25112 X-ray flares of which positions are determined from their optical counterparts. Under …

Study of a Coronal Mass Ejection with SOHO/UVCS and STEREO data

Susino, Roberto; Vourlidas, Angelos; Bemporad, Alessandro +1 more

We study the 3-D kinematics of a Coronal Mass Ejection (CME) using data acquired by the LASCO C2 and UVCS instruments on board SOHO, and the COR1 coronagraphs and EUVI telescopes on board STEREO. The event, which occurred on May 20, 2007, was a partial-halo CME associated with a prominence eruption. This is the first CME studied with UVCS data tha…

Propagation of normal and faster CMEs in the interplanetary medium

Shanmugaraju, A.; Umapathy, S.; Mujiber Rahman, A.

We have analyzed 101 Coronal Mass Ejection (CME) events and their associated interplanetary CMEs (ICMEs) and interplanetary (IP) shocks observed during the period 1997-2005 from the list given by Mujiber Rahman et al. (2012). The aim of the present work is to correlate the interplanetary parameters such as, the speeds of IP shocks and ICMEs, CME t…

The spatial distributions of the sources of UV solar Explosive Events at different velocities

Mendoza-Torres, J. E.

We analyze five solar Explosive Events observed in the Si IV emission line at 139.37 nm during SUMER/SoHO raster scans near disk center. The Doppler velocities from -45 km s^-1 to +45 km s^-1 were sorted into eleven symmetrically organized velocity bins, five equally-sized bins on each side and one bin for the line at rest. The…