Study of a coronal mass ejection using STEREO/SECCHI and SOHO/LASCO observations son Dal Lago 1 , Bernd Inhester 2 , Luis Eduardo Antunes Vieira 2 onal Institute for Space Research, Sao Jose dos Campos - SP, Brazil -Planck-Institute for Solar System Research, Katlenburg-Lindau, Germany
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Study of a coronal mass ejection using STEREO/SECCHI and SOHO/LASCO observations Alisson Dal Lago 1, Bernd Inhester 2, Luis Eduardo Antunes Vieira 2 1.
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Study of a coronal mass ejection using STEREO/SECCHI and SOHO/LASCO observations
Alisson Dal Lago1, Bernd Inhester2, Luis Eduardo Antunes Vieira2
1National Institute for Space Research, Sao Jose dos Campos - SP, Brazil2 Max-Planck-Institute for Solar System Research, Katlenburg-Lindau, Germany
► CME on Jan 8-9, 2007. SOHO: LASCO C2 (Jan 8, 2007, at 14:54UT, PA 65);
Quadrature observation of CMEs and corresponding ICMEs using SOLWIND coronagraph and Helios 1 plasma analyzer at heliocentric distance of 0.72+ 0.05 AU, from 1979 to 1982 (adapted from Sheeley et al., 1985).
Vcor1B = 70.97 km/s Est. onset date/time: 2007/01/08 07:42 UT
LinFit LASCO C3 Vc3 = 283.77 km/s PA 155 deg.
14 15 16 17 18 19 20 21 22 23 24 252
4
6
8
10
SECCHI COR2B SECCHI COR2A LASCO C2 PA 65 deg. V = 120 km/s
time (h)
Jan. 8th-9th, 2007
H(s
ola
r ra
dii)
Dal Lago et al., ILWS - 2009
The CME on Jan 8-9 2007
Dal Lago et al., ILWS - 2009
The CME on Jan 8-9 2007
Dal Lago et al., ILWS - 2009
Sun Venus
Assumption Travel time to 0.72 AU (hours) Estimated arrival date/time in Venus
comparison with similar past events (Sheeley et al., 1985)
67 Jan. 11th (2007), 09:54 UT
CME travel time model (Schwenn et al., 2005) adapted to 0.72AU
63 Jan. 11th (2007), 05:54 UT
constant final LASCO C3 velocity 105 Jan. 12th (2007), 23:54 UT
The CME on Jan 8-9 2007
Vexp
Vrad
Venus1 AU
Dal Lago et al., ILWS - 2009
► Observed by SOHO’s LASCO C2/C3 and STEREO SECCHI COR1A&B/2A&B and HI1A
► Detailed information was extracted using image processing techniques;
► CME released in the direction of Venus;
► Solwind – Helios comparison
► Various methods to predict travel time to Venus: not successful.
Summary
The CME on Jan 8-9 2007
Dal Lago et al., ILWS - 2009
The authors would like to acknowledge SOHO LASCO and EIT work team and STEREO SECCHI work team for providing the data used in this work. SOHO is a project of international cooperation between ESA and NASA. STEREO SECCHI data are produced by an international consortium of the Naval Research Lab. (US), Lockheed Martin Solar Astrophysics Lab (US), NASA Goddard Space Flight Center (US), Rutherford Appleton Lab (UK), Univ. of Birmingham (UK), Max-Planck-Institut für Sonnensystemforshung (Germany), Centre Spatiale de Liege (Belgium), Institut d’Optique Théorique et Appliqueé (France), and the Institut d’Astrophysique Spatiale (France).A. Dal Lago would like to acknowledge “Conselho Nacional de Desenvolvimento Científico e Tecnologico – CNPq”, of Brazil, for financial support.