lte -- Evaluates the polynomial fit made by RATEFIT routine.
lte obs T0 I0 I1 I2 I3 I4
Program LTE uses the methods described in Snowden and Freyberg (1993, ApJ, 404, 403) to evaluate the polynomial fit by RATEFIT routine to determine the number of counts (if any) to attribute to the long-term enhancement.
The LTE package does the following:
1) integrates the fitted polynomial to find the total number of cosmic background plus LTE counts in the observation
2) finds the minimum in the fitted polynomial.
3) finds the number of counts in the fitted polynomial in the excess over the minimum value. This excess is interpreted as the minimum value for the LTE contribution to the image and will be subtracted from the image.
The LTE package uses the following input files.
1) Observation ancillary data fits file : xxx_ANC.FITS for RDF data
2) Other fixed input :
valid_times.dat This must be the same time selection as used with the programs CASTDATA, CASTEXP, CASTPART, and TILT. The user can apply additional time-selection criteria such as the exclusion of intense periods of scattered solar X-ray or auroral contamination.
The screen output from the LTE package consists of the following: Exposure time, total counts, and net counts. The value net counts is used in the program CASTSSX as the long-term enhancement counts for casting into sky coordinates. The value total counts is the integral of the polynomial fit to the light curve, not the total number of observed counts. It does not include particle background or scattered solar X-ray counts.
1. For the input file test_ANC.FITS with input parameters T0=126347396, I0=19.9, I1=-23.95, I2=48.24, I3=0.0 and I4=0.0 the usage is
ft> lte test 126347396 19.9 -23.95 48.24 0.0 0.0
The "OBS" parameter must be limited to 8 characters. Versions prior to FTOOLS 4.3 required that the input files be in uppercase; this requirement was removed in FTOOLS 4.3