rhessi hard x-ray observations of an euv jet on august 21, 2003
DESCRIPTION
RHESSI Hard X-Ray Observations of an EUV Jet on August 21, 2003. Lindsay Glesener, S äm Krucker RHESSI Workshop 9, Genova September 4, 2009. Outline. Reminder: Emerging flux model Observations of the August 21, 2003 jet TRACE 171, 1550 RHESSI thermal and nonthermal - PowerPoint PPT PresentationTRANSCRIPT
RHESSI Hard X-Ray Observations of an EUV Jet on August 21, 2003
Lindsay Glesener, Säm Krucker
RHESSI Workshop 9, Genova
September 4, 2009
Outline
• Reminder: Emerging flux model
• Observations of the August 21, 2003 jet– TRACE 171, 1550– RHESSI thermal and nonthermal
• Analysis of reconnection geometry
Emerging Flux Model
(Shibata et. al, 1996)
Emerging Flux Model
(Shibata et. al, 1996)
partially occulted
August 21, 2003 flare
• Movie!
• http://sprg.ssl.berkeley.edu/~glesener/movie.html
August 21, 2003 flare: Time ProfileRHESSI TRACE 1550
6-8 keV
25-50 keV
• Visible early (only)• Thermal (<8 keV) and
nonthermal (>10 keV) emission
• Overall RHESSI temp ~13 K• Reconnection outflow?
Coronal sourceContour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 10-25 keV
Hot jet
Cool jet
Hot jet
Cool jet
• Visible early (only)• Thermal (>8 keV) and
nonthermal (>10 keV) emission
• Overall RHESSI temp ~13 K• Reconnection outflow?
Coronal sourceContour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 10-25 keV
Hot jet
Cool jet
• Nonthermal emission (>25 keV)
• No thermal emission• Overall RHESSI temp ~22 MK
Base of the JetContour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 25-50 keV
Hot jet
Cool jet
• Present throughout flare and jet.• Thermal (<10 keV) and
nonthermal (>12 keV)• Temp ~24 MK• Thermal electron density
• Instantaneous nonthermal electron density at peak time:
– Integrate over energy, use ni=thermal density
– Result: nnontherm ~ 2x108 cm-3
Near-Limb SourceContour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 25-50 keV
€
dn
dE=1.21×1042 γ(γ −1)2 B(γ −
1
2)AE−γ +1/ 2
niV
€
ntherm =EM
V~ 1011cm−3
Hot jet
Cool jet
Near-Limb SourceContour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 25-50 keV
• Late in the flare, a small, hot loop becomes visible:
Hot jet
Cool jet
Near-Limb SourceContour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 25-50 keV
• Late in the flare, a small, hot loop becomes visible:
Conclusion…• RHESSI observed HXR from an EUV jet. The HXR locations
and timing could indicate emission from reconnection outflow jets, lending support to the emerging flux model.
Lingering Questions…• Other explanations for the coronal emission? Outflow jets?
Looptop source? Something else??
• Why do we see nonthermal emission from the jet base with no thermal emission?
Extra Stuff
RHESSI images
Early phase First peak Second peak
Contour levels 30, 50, 70, 90%
Red: 6-8 keVBlue: 10-25 keV
Red: 6-8 keVBlue: 25-50 keV
Red: 6-8 keVBlue: 25-50 keV
August 21, 2003 flare: Spectra
Early phase Late phase