Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12a0739s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH12A-0739
Physics
7536 Solar Activity Cycle (2162)
Scientific paper
From inspecting limb CMEs we found that there is usually a good correlation between the apparent radial speed and the lateral expansion speed of CME clouds. In case of halo CMEs, the radial speed is inaccessible because of the geometry, but the expansion speed can still be determined. Thus, the halos' radial speed can be inferred and their travel time to Earth be estimated and compared with the observed travel time. We studied this connection using solar and interplanetary data for a period from January 1997 to April 2001. The data were primarily provided by the LASCO coronagraphs on SOHO, plus additional information from the EIT instrument. Solar wind data from SOHO, ACE and Wind were used to identify the arrivals of CME effects at the earth. Out of 280 full and partial halo CMEs recorded by LASCO we found 102 cases uniquely correlated with ejecta signatures right in front of the earth. For 94 of them, both the halo expansion speed Vexp and the travel time Ttr could be determined. The function Ttr = 220.8 - 22.75 * ln(Vexp) fits the data best.
C. O. St.Cyr
Dal Lago Alisson
Gonzalez Walter D.
Huttunen E.
Plunkett Simon P.
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