Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..97s&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
We considered the height-time data of the 307 CMEs observed using SOHO/LASCO during January - March 2005. In order to study the speed profile of the CMEs, we have used only 116 events for which there are at least 10 data points in the LASCO C2 and C3 range. Using this data, we have obtained the speed-distance profile and fitted it with linear fit. From this fitting, initial speed, limb speed and growth rate (dv/dh) are obtained. The results of this analysis are: (i) The initial speed obtained from the first two data points is in the range 24 - 1208 km/s that is nearly similar to the range of linear speed (67 - 920 km/s) obtained from the least square fit of all the data points. (ii) Nearly two thirds of the events (74/116) are found accelerating; (iii) The growth rate is within the range -0.058 to 0.061 s-1; (iv) Though the average of linear speed and initial speed are similar (around 380 km/s and 320 km/s, respectively), the initial speed or limb speed is better correlated with acceleration and growth rate than the linear speed; (v) However, the final height reached by the CMEs very weakly depend upon the initial speed or limb speed where as it depends strongly on the linear speed; (vi) The solar wind speed estimated from the initial speed versus acceleration plot is 375 km/s, where as, the same obtained from linear speed-acceleration graph is around 525 km/s. It seems from the above results that the initial speed of CMEs in the LASCO range and the drag due to the solar wind are important for the propagation of CMEs.
Moon Yong Jae
Shanmugaraju Annamalai
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