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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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Presentation on theme: "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."— Presentation transcript:

1 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 National Institute for Space Research, Sao Jose dos Campos - SP, Brazil 2 Max-Planck-Institute for Solar System Research, Katlenburg-Lindau, Germany

2 CME on Jan 8-9, SOHO: LASCO C2 (Jan 8, 2007, at 14:54UT, PA 65); LASCO C3 (Jan 8-9, 2007) ; STEREO: SECCHI COR1 A&B; SECCHI COR 2 A&B; SECCHI HI-1 A. Solwind – Helios observations Estimate of CME travel time to Venus x observations Summary 2007/01/082007/01/09 Outline Dal Lago et al., ILWS

3 2007/01/082007/01/09 Motivation Schwenn, Dal Lago, Huttunen (Kilpua) and Gonzalez, Ann. Geophys., 2005 Dal Lago et al., ILWS

4 SOHO: LASCO C2 (Jan 8, 2007, at 14:54UT, PA 65); LASCO C3 (Jan 8-9, 2007) ; EIT (did not detect any activity – CME behind the East limb). STEREO: SECCHI COR1 A&B; SECCHI COR 2 A&B; SECCHI HI-1 A. Set of observations SECCHI/COR1 B 14:41 UT LASCO/C3 01:42 UT 2007/01/082007/01/09 The CME on Jan Dal Lago et al., ILWS

5 STEREO/SECCHI COR 1 B (1.4-4 solar radii) 2007/01/08 14:41 UT SOHO LASCO C3 (4-32 solar radii) 2007/01/09 02:42 UT STEREO/SECCHI COR 1 B PA65 SOHO LASCO C3 PA 65 H (solar radii) Time (h) H (solar radii) Time (h) 5º The CME on Jan Dal Lago et al., ILWS

6 STEREO/SECCHI COR 1 B (1.4-4 solar radii) 2007/01/08 14:41 UT STEREO/SECCHI COR 1 B PA65 H (solar radii) Time (h) 5º The CME on Jan Dal Lago et al., ILWS

7 Coronagraph (2 – 18 solar radii) STEREO/SECCHI COR 1 B (1.4-4 solar radii) 2007/01/08 14:41 UT SOHO LASCO C3 (4-32 solar radii) 2007/01/09 02:42 UT STEREO/SECCHI COR 1 B PA 65 SOHO LASCO C3 PA 65 H (solar radii) Time (h) Dal Lago et al., ILWS

8 Coronagraph (2 – 40 solar radii) STEREO/SECCHI COR 1 B PA155 H (solar radii) Time (h) STEREO/SECCHI COR 1 B (1.4-4 solar radii) 2007/01/08 14:41 UT STEREO/SECCHI HI-1 A 2007/01/09 Dal Lago et al., ILWS

9 SunVenus Coronal Mass Ejection The CME on Jan Dal Lago et al., ILWS

10 SunVenus Jan 8, 2007 The CME on Jan Dal Lago et al., ILWS

11 SunVenus t 1AU = 203 – 20.77*ln(Vexp); (Schwenn et al., 2005)(1) t 1AU (Vexp=260km/s) = 87 hours(2) T 0.72AU = 0.72* t 1AU (3) hence, T 0.72AU = 63 hours(4) The CME on Jan Vexp Vrad Venus1 AU Dal Lago et al., ILWS

12 SunVenus Quadrature observation of CMEs and corresponding ICMEs using SOLWIND coronagraph and Helios 1 plasma analyzer at heliocentric distance of AU, from 1979 to 1982 (adapted from Sheeley et al., 1985). Solwind - Helios Dal Lago et al., ILWS

13 * Solwind - Helios Dal Lago et al., ILWS

14 The CME on Jan Dal Lago et al., ILWS

15 The CME on Jan Dal Lago et al., ILWS

16 The CME on Jan Dal Lago et al., ILWS

17 The CME on Jan Dal Lago et al., ILWS

18 SunVenus The CME on Jan Vexp Vrad Venus1 AU Dal Lago et al., ILWS

19 Observed by SOHOs 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 Dal Lago et al., ILWS

20 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 dOptique Théorique et Appliqueé (France), and the Institut dAstrophysique Spatiale (France). A. Dal Lago would like to acknowledge Conselho Nacional de Desenvolvimento Científico e Tecnologico – CNPq, of Brazil, for financial support. Acknowledgements The CME on Jan Dal Lago et al., ILWS


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