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Heliospheric Plasma Sheet and Flow from Streamer Belt

This research discusses the heliospheric plasma sheet and its flow from the streamer belt, including early observations, remote sensing of flows, and conclusions. The study also explores the occurrence rate of plasma sheet and its relationship to ejections of blobs.

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Heliospheric Plasma Sheet and Flow from Streamer Belt

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  1. Heliospheric Plasma Sheet and Flow from Streamer Belt Y. C.-M. Liu, A.B. Galvin , M.A. Popecki , K.D.C. Simunac , L. Kistler , C. Farrugia , M. A. Lee, B. Klecker, J.L. Luhmann, C.T. Russell, L.K. Jian, E. Moebius, R. Wimmer-Schweingruber, P. Wurz Space Science Center, University of New Hampshire

  2. Outline • Introduction to Heliospheric Current Sheet • Early observations on the ion composition of the Heliospheric plasma sheet • STEREO Observation • Remote Sensing of flows out of streamer belt • Conclusions

  3. Solar wind stream structure and heliospheric current sheet Alfven, 1977

  4. Early Superposed Epic studies on Current Sheet Crossing Dense Slow Cold Less Helium Speeds equal Temperatures close Borrini et al., JGR, 1981

  5. Plasma Sheet Gosling et al, 1981

  6. Plasma sheet of lower He/H Plasma sheet is usually at the edge of HCS.

  7. HCS determine • Using magnetic component • Both Br and Bt change sign at the same time • Both Br and Bt essentially retain the sign for at least one day before and after the HCS. • Br and Bt have different signs precede HCS crossing. We found 12 events on STEREO A from Jan, 2008 to Dec 2008. They fall into three classes.

  8. STEREO Observation -1 |V| Vr Vt Vn N HPS precedes HCS T P Entropy Br Bt

  9. STEREO Observation -2 |V| Vr Vt Vn N T P HPS follow the HCS Br Bt

  10. STEREO Observation -3 |V| Vr Vt Vn N T HPS Straddle the HCS P Br Bt

  11. HCS Crossings by STEREO A Total 13 events. Only 1 without plasma sheet. 5 straddle, 4 follow and 3 precede. All straddle are related with CIR or SI.

  12. Summary of the in situ observations

  13. Plasma in the core of the streamer belt in the solar corona Higher neutral hydrogen and lower O5+ density is observed SOHO/UVCS. Kohl et al, 2005

  14. Blobs flow out of the Streamer Belt SOHO/LASCO Wang et al, 2000

  15. How blobs flow out?-possible mechanisms Lead to more open magnetic flux and Less close flux HPS straddle HCS Reconnect with the same magnetic field. Hard to realize in a realistic 3D configuration Interchange reconnection is the dominant process HPS on the edge

  16. Occurrence Rate • The blobs should be observed the similar rate as plasma sheet if a plasma sheet corresponds to a blob • However, Wang et al. was vague on the occurrence rate. Four blobs a day: 1998 Continuous ejection: 2000

  17. Conclusions and Questions • HPS is flowing out from the streamer belt • How it happens, blobs or the ray-like structure after the ejection of the blobs. • The temporal or spatial scale of the HPS and its variations. • How dynamic is the process? Can A and B show different result?

  18. Br Bt Bn

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