Solar Energetic Particle Spectrum on 13 December 2006 Determined by IceTop Page: 4 of 7
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2: 210 De emb 4200 6:3 S(OU
13 December 2006 (UT)
Fig. 1. Average Single Photo Electron (SPE)
discriminator counting rate in IceTop prior to and
during the solar particle event of 13 December
2006. Data are averaged over five minute inter-
1 Ox10 2 20x102 30x102
A [1/cm2 sr s MV]
600 800 1000 1200 1400 1600 1800 2000 2200
Background count rate [Hz]
Fig. 3. IceTop proton spectrum from the fit in
Figure 2 (heavy blue line with one sigma error
band). The black line is the assumed background
cosmic ray proton spectrum and the points are
the maximum proton fluxes from GOES spacecraft
Fig. 2. Increase of individual IceTop discrim-
inator counting rates averaged from 0320UT to
041OUT over that during a reference interval
(0115UT to 0255UT) plotted against counting rate
during the reference interval. Bars indicate statis-
tical errors. Blue line is the best fit to a power law
(in rigidity) spectrum, APt. Gray lines give the
one sigma error band on the spectrum as discussed
in the text. Three discriminators (open symbols)
showed anomalous behavior and were excluded as
described in the text. The insert illustrates cor-
relation of error estimates for the fit parameters
02 20 02 40 03 00 03 20 03 40 04 00 04 20 04 40 05 00 05 20 05 40 06 00
December 13, 2006
Fig. 4. (Top) Calculated increase in a sea level
neutron monitor based on the IceTop spectrum
(heavy black circles) compared with the count-
ing rate of several near sea level neutron mon-
itors. Traces for Oulu, Apatity, Mawson, No-
rilsk and Barentsburg are labelled while those
for Cape Schmidt, Fort Smith, Inuvik, Nain,
Peawanuck, Tixie Bay, and Thule are not. (Bot-
tom) Spectral index from IceTop compared to that
of Vashenyuk et al. (2007b)
I I I
o IE E
I I IE
- A0= 1.77 0 X10 2 -
-Norilsk r 1
OVashenyuk et al. (2007b)
- # IceTop
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Collaboration, IceCube & Klein, Spencer. Solar Energetic Particle Spectrum on 13 December 2006 Determined by IceTop, article, October 11, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc929668/m1/4/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.