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Extension of Magnetic Clouds in the Inner Heliosphere as observed from Multi-Spacecraft

Extension of Magnetic Clouds in the Inner Heliosphere as observed from Multi-Spacecraft. Aline de Lucas Alisson Dal Lago Rainer Schwenn Alicia L. Clúa de Gonzalez. Motivation.

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Extension of Magnetic Clouds in the Inner Heliosphere as observed from Multi-Spacecraft

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  1. Extension of Magnetic Clouds in the Inner Heliosphere as observed from Multi-Spacecraft Aline de Lucas Alisson Dal Lago Rainer Schwenn Alicia L. Clúa de Gonzalez ILWS Conference, October 5, 2009

  2. Motivation The main motivation of the possibility to observe magnetic clouds at multi-spacecraft and estimate their longitudinal extent in the inner heliosphere. ILWS Conference, October 5, 2009

  3. The Helios 1&2 solar probe mission The orbits of the Helios 1&2 solar probes in 1976 The mission lasted from Dec. 1974 to March 1986 Helios had a complete set of particle and field instruments, no optical telescopes ILWS Conference, October 5, 2009

  4. Helios 1&2 a stereo-mission! ILWS Conference, October 5, 2009

  5. A transient MC driven shock, seen from Helios 1&2 270 apart in longitude He 1 He 2 He 1 He 2 Helios orbits in 1977 77:29, He 1 77:28, He 2 ILWS Conference, October 5, 2009

  6. MC seen from Helios 1&2 270 apart in longitude shock MC HSS Shocks and MCs were detected by H1,2 and at the Earth shock MC ILWS Conference, October 5, 2009

  7. Observation near Earth shock Shocks and MCs were detected by H1,2 and at the Earth HSS MC H2 and IMP-8 are separated by only 9 degrees and they observed similar features. ILWS Conference, October 5, 2009

  8. MVA for the MC seen by H1,2 and IMP-8 H2 H1 IMP-8 By* Despite of the different rotations patterns, the direction is the same. Ambiguity of 180º Bx* ILWS Conference, October 5, 2009

  9. Small Separation and Different Magnetic Features ILWS Conference, October 5, 2009

  10. MVA for the MCs observed by H1 and H2 on DOY 75-76/1977 H2 H1 By* Bx* H1 and H2 are separated by less than 19º. Despite of this fact, the magnetic field rotation inside the MC is different ILWS Conference, October 5, 2009

  11. H2 and IMP-8 observation 2 days later H2 is 7º away from the Sun-Earth line. ILWS Conference, October 5, 2009

  12. MVA technique applied to the MC H2 IMP-8 By* Bx* H2 and IMP-8 have the same rotation direction. Clouds’ axes have different orientations. ILWS Conference, October 5, 2009

  13. Statistics of all „safe“ MCs involving Helios1 & Helios2, IMP8 and ISEE3 MCs may extend to 900; Multi-Spacecraft Observed MCs ILWS Conference, October 5, 2009

  14. Shocks extend to larger distances compared to their drivers De Lucas (2009) ILWS Conference, October 5, 2009

  15. Concluding Remarks • MCs showed to behave as well organized structures when analyzed separately by the MVA technique; • Some MCs showed different rotation and axial directions according to the measurements from different probes; • Could it be that the technique is not accurate enough to analyze this type of structures in order to provide information about their shapes? Or could be that MCs are not completely connected like a long flux tube? • MCs observed by Helios extended to smaller distances compared to the shock waves driven by ICMEs. ILWS Conference, October 5, 2009

  16. THANKS! ILWS Conference, October 5, 2009

  17. ILWS Conference, October 5, 2009

  18. Minimum Variance Analysis (MVA) MVA can tell us the direction of the rotation and the clouds’ orientation. Source: Adapted from Goldstein (1993). ILWS Conference, October 5, 2009

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