Dec. 18-19, 2006 Milagro Collaboration Mtg. 1 Solar and Heliospheric Report J. Ryan Trevor Morgan
Solar and Heliospheric Report
Jan 22, 2016
Solar and Heliospheric Report. J. Ryan Trevor Morgan. Diversion of effort for last 6 months. Recent Activity 35% GLE increase in Oulu. Were working on 2005 January 20 GLE. Most intense event in 50 years. Progress on 2005 January 20. - PowerPoint PPT Presentation
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Dec. 18-19, 2006 MilagroCollaboration Mtg.
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Solar and Heliospheric Report
J. RyanTrevor Morgan
Dec. 18-19, 2006 MilagroCollaboration Mtg.
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Diversion of effort for last 6 months
Dec. 18-19, 2006 MilagroCollaboration Mtg.
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Dec. 18-19, 2006 MilagroCollaboration Mtg.
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Recent Activity35% GLE increase in Oulu
Dec. 18-19, 2006 MilagroCollaboration Mtg.
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Were working on 2005 January 20 GLE. Most intense event in 50 years.
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Progress on 2005 January 20
• Started simulations to re-evaluate throw area for scalers (for proper effect. area)
• Started simulations to determine effective area for various scalers
• Started simulations using pencil beam from zenith to study multiplicity dependence on incident directions (to confirm or reject overhead beam).
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Interest in (1) extended emission or (2) isotropized population, either of which could produce tail.What is J at Milagro/Climax as compared to elsewhere?
What is A in spike and how does it evolve?What is happening at 0800? instruments see extended emission. Do we?Milagro sees second increase at 0700, but not Climax??
Dec. 18-19, 2006 MilagroCollaboration Mtg.
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8.5
8.0
7.5
7.0
6.5
6.0
x106
03:00 06:00 09:00 12:00 15:00
UT
High Threshold Rate2005 January 20
Need to flatten baseline
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Science Qs
• Interplanetary conditions?– Solar wind speed (guiding center path)
– Turbulence level (rise time) (appears to be low)
• CME lift-off time and speed. (Release time)
• Hard X-ray onset time.• Signals from other NMs to ‘estimate’ anisotropy. (1/cos )
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Halloween Event
3800
3600
3400
3200
3000
2800
10/18/03 10/23/03 10/28/03 11/2/03
UT
1.35
1.30
1.25
1.20 2003 October/November
Climax Milagro
1.5%
6%
3.2%/day
4.3%/day
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Science Questions
• Spectrum of Decrease• Anisotropy of Decrease
– Depends on magnetic fields 1. In front of shock2. Behind shock3. Inside ejecta4. Behind ejecta
– Should see A change in time.
• Recovery time vs. energy (backfilling heliosphere)
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Tasks• Continue sims for area and multiplicity.
• Need a muon fitter to study triggered events in Forbush decreases.
• Restart work on PCA description of background to compare to UCSC work. Applies to both scalers and triggered events.
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More work
• Need environmental correction factors for long periods, i.e., days.– Which way does stratospheric temperature effect go and how large is it?
– Should first simulate effect for T at loft.
• Instantaneous cutoff ridigities for Climax/Fenton Hill/MW/Durham
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Other investigations
• How many GLEs have we really registered? Need a systematic look, triggered off, probably, Climax curves.
• How many Forbush decreases have we registered? (Triggered and scalers) Can also do a selective search here using MW or Durham data.
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Upcoming Events
• Spring General Assembly AGU– Acapulco
• ICRC Yucatan• AOGS Bangkok• AAS Honolulu
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