Ginga Specific Software: Program BGDSAAB
Program bgdsaab inserts psuedo-housekeeping parameters into
an existing data file. These new parameters are called SAA_1,
SAA_2 etc. and represent the radiation induced in
Ginga by passage through the South Atlantic Anomaly (SAA). Each
parameter is a time counter with a different decay rate.
Bgdsaab differs from bgdsaa
and bgdsaa37 as the model of the
SAA may include or exclude the 37-day precession of the Ginga
orbit.
A Ginga CUBE or TIME series into which it is desired to
insert the parameters.
Bgdsaab requires five input parameters. The QX parameter
system is used to read these parameters.
| BGD_DATIN |
The name of the CUBE or TIME series. |
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| BGD_RETRO |
In order that the time counter is well estimated at the start of
the data it is necessary to track the passage of Ginga through
the anomaly for some period before the start of data file. This
parameter defines this period (in hours). The numerical value should
be at least 24 hours and at least a factor of 3 greater than the
largest decay. |
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| BGD_NDECAY |
The induced radiation caused by passage through the SAA decays
exponentially at various rates. This parameter defines how many
separate decay rates are to be included. |
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| BGD_DECAY(BGD_NDECAY) |
This parameter defines the decay rates (in hours). |
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| BGD_MODEL(BGD_NDECAY) |
This parameter defines the model of the SAA to be used.
Possible models include:
| simple |
A simple time counter. |
| simple * long |
As above but includes Hayashida's long timescale factor. |
| 37 |
A time counter that includes the 37-day precession in the
Ginga orbit. |
| 37 * long |
As above but includes Hayashida's long timescale factor. |
| 37 + simple |
Similar to 37. |
| ( 37 + simple ) * long |
As above but includes Hayashida's long timescale factor. |
Note that Bgdsaab is functionally identical to bgdsaa if
| BGD_MODEL(BGD_NDECAY) = simple |
Bgdsaab is functionally identical to bgdsaa37 if
| BGD_MODEL(1) = 37 + simple |
| BGD_MODEL(I = 2, BGD_NDECAY, 1) = simple |
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Bgdsaab returns three output parameters. The QX parameter
system is used to display these parameters.
| BGD_RETRO |
The period (in hours) during which the passage of the satellite
was tracked through the anomaly prior to the start of the data. |
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| BGD_NDECAY |
The number of separate decay rates included. |
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| BGD_DECAY(BGD_NDECAY) |
The decay rates (in hours). |
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