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Summary


PROBA-1/SREM summary plots

proton/electron counter
PROBA-1/SREM proton/electron environment

proton counter
PROBA-1/SREM proton environment

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Historical Plots

2001
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2002
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2003
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2004
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2005
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2006
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2007
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2008
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2009
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2010
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2011
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2012
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2013
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2014
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

2015
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2016
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2017
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2018
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Legend

The two PROBA-1/SREM summary plots show the temporal variations of the proton and electron environment in the Earth's outer radiation belt.

PROBA-1 passes the outer radiation belt region twice per approximately 90 minutes at varying magnetic latitudes. Thus at a given L-shell, observed variations of the omnidirectional particle fluxes during successive orbits are combinations of temporal variations and the magnetic latitude effect. Special care must therefore be taken to distinguish between these two contributions.

The values shown in the summary plots represent the temporal variations and are computed as follows:
1. Average count rates per radiation belt passage (3.0 < L < 7.0) are computed for the SREM scalers TC3 (proton/electron scaler) and S15 (proton scaler). Scaler TC3 is sensitive to electrons at E>0.5 MeV and protons at E>10 MeV and scaler S15 is sensitive to electrons at E>9.5 MeV and protons at E>10 MeV.
2. For each radiation belt passage an average magnetic latitude is computed which is used to correct the average count rates for the magnetic latitude effect. The correction factor is latitude and scaler dependent and is determined during geomagnetic quiet periods where temporal variations are assumed to be neglectable. In case of TC3 only a restricted range of average magnetic latitude is accepted. During belt passages at very high latitudes the count rates in this scaler are dominated by cosmics.
3. In case of scaler TC3 the corrected average count rates are further smoothed by applying a sliding average with a window of 12 hours. In case of scaler S15 no further smoothing is applied.
4. The such computed data points are then plotted versus the medium time of each selected belt passage.

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