Upload
lamont
View
49
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Identification of Prominence Material in Magnetic Cloud. Shuo Yao China University of Geosciences (Beijing) [email protected] Co-authers: E. Marsch 2 , C.-Y. Tu 1 and R. Schwenn 2 1: Department of Geophysics, Peking University, China - PowerPoint PPT Presentation
Citation preview
1
Identification of Prominence Material in Magnetic Cloud
Shuo Yao China University of Geosciences (Beijing)
Co-authers: E. Marsch2, C.-Y. Tu1 and R. Schwenn2 1: Department of Geophysics, Peking University, China 2: Max-Planck-Institut for Solar System Research, Germany
ILWS Workshop 2011, Friendship Hotel, Beijing, China
2
Background
1. CME
Bright loop---plasma pile up
Dark cavity---magnetic flux ropes
Bright core---prominence
3-part CME
3
2. Magnetic CloudOne type of
Interplanetary Coronal Mass
Ejection (ICME) Enhanced magnetic field
strength Smooth rotation of
magnetic field vector in day’s time
Low proton temperature
171 172 173
Helios 1 1981 DOY171-173
4
Prominence Filament
NASA SOHO
3. Prominence Material
Cold and dense material from chromosphere
5
Temperature: 5000-8000K
Character Ions: He+
Position in CME: Centre of the flux rope Priest 1989, Crooker and Horbury 2005
Zong et al,.2004Gopalswamy, 2006
6
?
Forbes et al., 2001
3. The problem
Bothmer and Schwenn, 1998
Identification of 3-Part CME From In Situ MC Observations----Especially the prominence material !!
7
Report Flux Rope Np and Tp He+
However, not all the features identified in one event…….
88
My workAim: identify prominence material from the in-situ observation of magnetic cloud.Cases:1979DOY129, at 0.3 AU
1976 DOY 90, at 0.5 AU
1978DOY358, at 0.7 AU
Evidences:
1.High Np and low Tp
2.Located on centre of magnetic field flux rope
3.Existence of He+
4. Heating before and after revealed by Velocity distribution function (temperature )
99
1. SatelliteHelios 2: 1976-1980
electrostatic analyzers
0.3 AU
1010
Case 1
0.3 AU
High Np and low Tp
Flux rope structure
2. Case Study
Yao et al., 2010, JGR
11
Possible existence of He+
H+ : He2+ : He+ m 1 4 4q 1 2 1m/q 1 2 4
E/q E/q~m/q
Yao et al., 2010, JGR
1212
Thermal velocity distribution functions
Heating perpendicular to B
Solid Line——local B
X——outward solar radial direction
13
22 Hours ahead , Solwind observed CME with prominence eruption
Sheeley , 1980
SOLWIND Observation
600km/s×22h
~4.5×107 km ~0.3 AU
1AU~1.5×108 km
1414
Case 2
0.5 AU
High Np and low Tp
Flux rope structure
1515
Possible existence of He+
H+ : He2+ : He+ m 1 4 4q 1 2 1m/q 1 2 4
16
Thermal velocity distribution functions
Heated Plasma Before and After Prominence Material
17
Case 3
0.7 AU
low Tp and High Np
Flux rope structure
Prominence material is 2 hours behind the neutral line of flux rope.
1818
Possible existence of He+
H+ : He2+ : He+ m 1 4 4q 1 2 1m/q 1 2 4
1919
Thermal velocity distribution functions
Heated Plasma Before and After Prominence Material
20
Report Flux Rope Np and Tp He+
Yao 2010 X X X
Complete evidences from in situ measurements
Summary
21
SOHO
Gopalswamy SpaceSciRew, 2006 Yao et al., 2010, JGR
NASA
Remote Observation
Model
In situ measurement
22
It seems….Closer to the Sun, the more info about CME
So…we do expect more on Solar Orbiter & Solar Probe+ in the Next Cycle ….
2323
Thanks !