Yama's works

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Yama's works
Using geomagnetic data

1. 2003-10-29 (Halloween) event quick development
   in 6 min.
2. 2000-11-08 event Isolated southward IMF
   propagation.
3. SSN-K (and SSN-Kp) relation non-linearly low
   since 2004
4. 1986-9-12 event PC-5 pulsation affecting ions
5. 2002-5-19 event Sunward propagating structure
   aurora

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2003-10-29 event
gt SW 2000 km/s
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Kiruna data gives most smooth curve
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Ground ?B auroral image
061140 UT
061540 UT
evening-midnight
IQA01 LT
morning
061340 UT
061740 UT
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Extremely low solar activity since last solar
minimun
?Effect on the Earth? (SCOSTEP VarSITI program)
Kiruna (65 GMLat) K index during the current
maximum 24 (2011) is nearly the same as values
at solar minimums. note 21-24 UT means 22-01
LT, and magnetic midnight sector when aurora
activity causes large K.
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SSN Kp (subdivided by different phases)
Min
Incl.
Max
Decl.
1. Each solar cycle must be subdivided by
different phases (because the solar wind
condition is different for the same SSN)
2. Kp since 2004 are the lowest for the same SSN
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Reconstruct Kp from SSN
(note subdivide by different phases) ?
reconstruct within standard deviation except the
recent 10 years. ? change from 2004 is clear
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Chance of minor storm_at_high-latitude by NOAA vs.
observed Kp
(Anna Larsson, high-school student project)
of observed Kp (largest of the day)
For the same prediction, Kp values are (model is
different between 2000 ? 2011) 2011-2012 lt
2007-2008 2000-2001 lt 2003-2004
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2000-11-08 event
Unique IMF Bz10 nT ? -3 nT ? 10 nT change Only
once in 50 years Kiruna data (examined all data
from 1954) All polar geomagnetic stations showed
similar signature, propagating tailward with the
solar wind velocity Presented at EGS 2001 (EGU
EGS EUG), but could not publish because I got
sick when I finished analyses
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solar wind
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Kiruna
X
Y
Z
AU
AL
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1986-9-12 event
Finland conjugate online Kiruna only
analogue data
Viking conjugate
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Viking
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2002-5-19 event
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overview
ions gt 5000 km/s
ions 3000 km/s
P/A
0.0140 keV
P/A
0642
0646
0648
0644
IMAGE (FUV)
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AE and Bx

• Main phase of minor storm (Dst -60 nT).
• 2. Substorm onset at around 0625 UT but ceased
  in 10 min.
• 3. New activity started at around 0638 UT.
• 4. Aurora bulge arrived Clusters conjugate 19
  MLT at around 06420644 UT.

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sunward propagation
10002000 km
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(No Transcript)
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Misato Aurora Camera
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Misato Aurora Camera