space weather in medium earth orbit
DESCRIPTION
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. MEO Orbit. 23200km altitude circular orbit 56° inclination Crosses the Trapped Electron belt at L=~ 4.5 Giove-A Operational since end Dec. 2005 - PowerPoint PPT PresentationTRANSCRIPT
ESA UNCLASSIFIED – For Official Use
Space Weather in Medium Earth Orbit
H.D.R. Evans, K. Ryden, P. Nieminen, E. Daly, P. Buehler, W. Hajdas, A. Zadeh
ESWW7, Brugge15/11/2010
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 2
MEO Orbit
23200km altitudecircular orbit56° inclinationCrosses the Trapped
Electron belt at L=~ 4.5
Giove-A Operational since
end Dec. 2005Giove-B
Operational since
May 2008
IntegralGalileoIntegral (4.5<L<5)
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 3
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
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 4
Giove-A Merlin SURF Response
K.
Ryden (
Qin
eti
Q),
“M
easu
rem
ents
of
Inte
rnal ch
arg
ing C
urr
ents
in M
EO
: 2
00
5-1
0,
SC
TC
-20
10
, A
lbuquerq
ue,
NM
, U
SA
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 5
Trapped Electron Belt – GioveA/Merlin
K. Ryden (QinetiQ), “Measurements of Internal charging Currents in MEO: 2005-10, SCTC-2010, Albuquerque, NM, USA
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 6
Giove-A/MERLIN Spectral Response
K.
Ryden (
Qin
eti
Q),
“M
easu
rem
ents
of
Inte
rnal ch
arg
ing C
urr
ents
in M
EO
: 2
00
5-1
0,
SC
TC
-20
10
, A
lbuquerq
ue,
NM
, U
SA
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 7
15 July 2008 COSPAR15 July 2008 COSPAR 77
IREM ChannelsIREM Channels
Gre
y =
low
res
pons
e to
ele
ctro
ns
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 8
Trapped Electron Belt – GioveB/SREM
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 9
INTEGRAL/IREM from 4.5<L<5.0
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 10
Giove-B/SREM – RadFET doses
ESA UNCLASSIFIED – For Official Use
MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 11
Herschel/SREM: Solar Proton Events
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MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 12
Solar Proton Events
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MEO Radiation Environment | H.D.R. Evans | ESWW7, Brugge | 15/11/2010 | TEC-EES | Slide 13
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.