HR: 0800h
AN: SH31A-0236    [Abstracts]
TI: A Statistical Study of the Ejecta - Shock Standoff Distance of Geoeffective Events
AU: * Lara, A
EM: alara@geofisica.unam.mx
AF: Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, IGEF, C.U., Mexico D. F., 04510, Mexico
AU: * Lara, A
EM: alara@geofisica.unam.mx
AF: Catholic University of America, 200 Hannan Hall, Washington DC, 20064, United States
AU: Gopalswamy, N
EM: gopals@ssedmail.gsfc.nasa.gov
AF: NASA/GSFC, Code 695, Greenbelt, MD 20771, United States
AU: Yashiro, S
EM: seiji@ssedmail.gsfc.nasa.gov
AF: NASA/GSFC, Code 695, Greenbelt, MD 20771, United States
AU: Yashiro, S
EM: seiji@ssedmail.gsfc.nasa.gov
AF: Catholic University of America, 200 Hannan Hall, Washington DC, 20064, United States
AU: Borgazzi, A I
EM: andreaines@gmail.com
AF: Divisao de Geofisica Espacial,Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Sao Jose dos Campos, 12121, Brazil
AB: e study the interplanetary transport of 57 coronal mass ejections (CMEs), which are part of the events responsible for large geomagnetic storms of solar cycle 23 listed in the CDAW database. The interplanetary counterparts of these CMEs (ICMEs) were shock-driving and have caused intense (Dst < -100) geomagnetic storms. We study the statistical behavior of the standoff distance and time between the ICME and the shock. We divided our events into two groups, 1) events where there is likely a one-to-one relationship between the CMEs and ICMEs (unique events) and 2) events where multiple CMEs may be associated with a single ICME. We find that the standoff time of the unique events follows a normal distribution whit a mean of 7.6 hr. and a sigma σ = 4.7 hr. The standoff distance of unique events also follows a normal distribution with a mean of ~ 0.1 AU and a sigma of ~ 0.05 AU. We did not found any relationship between the position of the AR,associated to the low coronal CME activity, and the standoff distance. On the other hand there seems to be a linear relationship between the CME speed and the standoff distance.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7513 Coronal mass ejections (2101)
DE: 7900 SPACE WEATHER
DE: 7954 Magnetic storms (2788)
DE: 7974 Solar effects
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting