Transcript Space Weather in Medium Earth Orbit HDR Evans

Space Weather in Medium Earth
Orbit
H.D.R. Evans, K. Ryden, P. Nieminen, E. Daly, P. Buehler,
W. Hajdas, A. Zadeh
ESWW7, Brugge
15/11/2010
ESA UNCLASSIFIED – For Official Use
MEO Orbit
23200km altitude
circular orbit
56° inclination
Crosses the Trapped
Electron belt at
L=~ 4.5
Giove-A
Operational since
end Dec. 2005
Giove-B
Operational since
May 2008
Integral
Galileo
Integral (4.5<L<5)
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 2
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Instrumentation
1.Giove-A
a.MERLIN:
3 SURF Plates
RadFETs (3 & 6 mm)
Proton > 40 MeV
Ion/LET detector
b.CEDEX
LET telescope
Experimental Dose rate diodes
2.Giove-B: SREM
Three ORTEC type PIPS diodes, two in
coincidence
RadFET
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 3
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K. Ryden (QinetiQ), “Measurements of
Internal charging Currents in MEO:
2005-10, SCTC-2010, Albuquerque,
NM, USA
Giove-A Merlin SURF Response
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 4
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Trapped Electron Belt – GioveA/Merlin
K. Ryden (QinetiQ), “Measurements of Internal charging Currents in MEO: 2005-10, SCTC-2010,
Albuquerque, NM, USA
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 5
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K. Ryden (QinetiQ), “Measurements of
Internal charging Currents in MEO:
2005-10, SCTC-2010, Albuquerque,
NM, USA
Giove-A/MERLIN Spectral Response
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 6
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Grey = low response
to electrons
IREM Channels
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 7
15 July 2008
COSPAR
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7
Trapped Electron Belt – GioveB/SREM
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 8
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INTEGRAL/IREM from 4.5<L<5.0
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 9
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Giove-B/SREM – RadFET doses
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 10
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Herschel/SREM: Solar Proton Events
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 11
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Solar Proton Events
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 12
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Conclusions
1. The trapped electron environment is very dynamic but has been very
quiet for much of the Giove-B mission, > ½ the dose has been
accumulated in the last 8 Months.
2. The Electron Belt event on the 6th April was a notably strong event in
the 4.5<L<5 range, particularly for the higher energy (>2 MeV)
electrons.
3. Since the April Event, the environment has continued to be active,
but at a lower level than seen during the last period of solar
maximum
4. Only a few very small solar proton events have been seen in the last
years, and the results from Herschel & Planck show an anisotropy in
the distribution.
The Sun is starting to increase in activity,
but it is still fairly quiet.
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 13
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