ACE/SIS-CRIS Charge and Counts vs Time Plots
SIS Charge vs time Plots
These plots show the calculated nuclear charge Z as a function
of detection time for each pulseheight-analyzed particle recorded
by SIS.
SIS/CRIS Count Plots
These data consist of 4 SIS rates and 1 CRIS rate (in counts/second)
versus time, with one month of data per plot. Since the data are given
in counts/second, the energy intervals and geometry factors must be
corrected for before obtaining meaningful abundance ratios from these
data. The data are derived from SIS and CRIS level 1 rate data and are
an improvement over the Browse data, in that sensor priority schemes
have been corrected for. However, the data still contain a certain
amount of background (especially the T4 and He SIS rates) which have not
been corrected for.
The 4 SIS rates are as follows:
- T4 - the singles rate for detector T4, this rate is primarily protons
of energies > 10 MeV (also used in the ACE RTSW plots).
- He - the He buffer rate for ranges 0-2, corresponding to ~4-7 MeV/nucleon.
- CNO - the CNO buffer rate for ranges 0-2, corresponding to ~7-15
MeV/nucleon.
- Ne-Fe - the Z >= 10 buffer rate for ranges 0-2, corresponding to ~9-20 MeV/nucleon.
The CRIS rate is:
- the weighted average of the Z >= 10 buffer rates for ranges 3-4,
5-7, and 8, corresponding to ~100-400 MeV/nucleon. This data is
generally not available during high rate time periods.
These plots are for browse purposes only and are not suitable for
serious scientific study. For that you should use Level 2 data.
These files can be downloaded via anonymous ftp, from mussel.srl.caltech.edu in the directory:
pub/ace/level3/sis
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Last Updated: Tue Jul 18 12:15:49 PDT 2000