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Basic Information on zeemap
Purpose: Map the magnetic field from I and V cubes
Categories: profile analysis
ZEEMAP tries to find the line-of-sight magnetic field splitting
a transition by measuring the shift in the line owing to the
Stokes I spectral cube with channel on the first axis.
Stokes V spectral cube with channel on the first axis.
Output file name for line-of-sight magnetic field.
Output file name for the derivative of I/2 spectrum (op=div
Output file name for the error in B (op=div only).
Output file name for amount of residual I found in V (op=fit
Bottom left corner of box to be fit.
Top right corner of box to be fit.
Frequency of line in GHz, used to determine amount of splitting
Operation code that controls how the line shift is determined -
div: by dividing V by the derivative of I/2, or
fit: by fitting of the derivative of I and I to V.
For op="div", the division will not be performed unless the
derivative of I/2 is greater than cutoff.
For op="fit", the fit will not be performed unless one or more
channels in the I spectrum is larger in absolute value than
RMS deviation in V spectrum in a signal free area. This can
be obtained using histo. Used for calculating error in B
This determines the algorithms used, if operation="fit". It
can consist of several flags:
l Include leakage term,
2 Use 2 sided derivative approximation,
m Use maximum likelihood technique,
x Perform extra checks for better solutions, when
using the maximum likelihood technique.
Key: y corlen
Correlation length. Selected window must be divisible by this
number, which is the number of pixels over which you think the
magnetic field might be constant. Default is 1, try maybe 2
Revision: 1.4, 2010/11/22 05:06:16 UTC
Generated by email@example.com on 21 Jun 2016