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Chuck Dolan
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Testing description formatting for ESA-NASA VariableCadence, one more time
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NumericalData/Cluster/C1/WBD/VariableCadence.xml

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CALIBRATION: The procedure used in computing the calibrated Electric Field and Magnetic Field values found in this file can be obtained from the Cluster WBD Calibration Report archived at the CSA website in the Documentation section. Because the calibration was applied in the time domain using simple equations the raw counts actually measured by the WBD instrument can be obtained by using these equations and solving for "Raw Counts", keeping in mind that this number is an Integer ranging from 0 to 255. Since DC offset is a real number, the resultant when solving for raw counts will need to be converted to the nearest whole number. A sample IDL routine for reverse calibrating to obtain "Raw Counts" is provided in the WBD Calibration Report archived at the CSA.
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CONVERSION TO FREQUENCY DOMAIN: In order to convert the WBD data to the frequency domain via an FFT, the following steps need to be carried out:
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| 1) If Electric Field, first divide calibrated data values by 1000 to get V/m; |
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| 2) Apply window of preference, if any (such as Hann, etc.); |
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| 3) Divide data values by sqrt(2) to get back to the rms domain; |
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| 4) Perform FFT (see Bandwidth variable notes for non-continuous modes and/or the WBD User Guide archived at the CSA); |
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| 5) Divide by the noise bandwidth, which is equal to the sampling frequency divided by the FFT size (see table below for appropriate sampling frequency); |
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| 6) Multiply by the appropriate constant for the window used, if any. |
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| If Electric Field, first divide calibrated data values by 1000 to get V/m; |
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| Apply window of preference, if any (such as Hann, etc.); |
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| Divide data values by sqrt(2) to get back to the rms domain; |
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| Perform FFT (see Bandwidth variable notes for non-continuous modes and/or the WBD User Guide archived at the CSA); |
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| Divide by the noise bandwidth, which is equal to the sampling frequency divided by the FFT size (see table below for appropriate sampling frequency); |
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| Multiply by the appropriate constant for the window used, if any. |
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These steps are more fully explained in the WBD Calibration Report archived at the CSA.
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