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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
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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
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Solar wind stream structure and heliospheric current
sheet
Alfven, 1977
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Early Superposed Epic studies on Current Sheet Crossing
Borrini et al., JGR, 1981
Dense
Slow
Cold
Less Helium
Speeds equal
Temperatures close
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Gosling et al, 1981
Plasma Sheet
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Plasma sheet of lower He/H
Plasma sheet is usually at the edge of HCS.
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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.
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STEREO
Observation -1
HPS precedes HCS
|V|
Vr
Vt
Vn
N
T
P
Entropy
Br
Bt
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STEREO
Observation -2
HPS follow the HCS
|V|
Vr
Vt
Vn
N
T
P
Br
Bt
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STEREO
Observation -3
HPS Straddle the HCS
|V|
Vr
Vt
Vn
N
T
P
Br
Bt
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HCS Crossings by STEREO ADate(MONTH/DAY)
Time (HHMM-HHMM)
HPS Precede, follow or straddle?
HPS duration
CIR time difference
01/06 15:10-15:11 Y straddle 8 hours < 1 hour
01/13 21:16-21:24 Y precede 5 hours >1 day
02/02 08:45-08:55 Y straddle 6 hours < 1hour
02/10 07:15-07:16 N
04/05 17:04-17:06 Y precede 2 hours > 10 hours
04/24 13:41-13:42 Y follow 3 hours < 1 hour
05/21 08:31-08:33 Y Straddle, 5 hours 3 hours later
06/26 10:02-10:06 Y follow 2 hours >8 hours
08/02 18:51-18:52
Y straddle 6 hours <2 hours
08/18-19 End of 18 Y Straddle 8 hours < 1hour
09/16 02:08-02:20 Y Precede 7 hours > 10 hour
11/17 13:42-13:43
Y Follow 2 hours > 24 hours
12/14 04:18-04:19 Y follow 3 hours > 24 hours
Total 13 events. Only 1 without plasma sheet. 5 straddle, 4 follow and 3 precede. All straddle are related with CIR or SI.
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Summary of the in situ observations
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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
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Blobs flow out of the Streamer Belt
Wang et al, 2000 SOHO/LASCO
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How blobs flow out?-possible mechanisms
Lead to more open magnetic flux and Less close flux
Reconnect with the same magneticfield. Hard to realize in a realistic 3Dconfiguration
Interchange reconnection is the dominant process
HPS straddle HCS
HPS on the edge
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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
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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?
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Br
Bt
Bn