Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stecf.org/software/IRAFtools/stecf-iraf/adass99/P2-21/node5.html
Дата изменения: Tue Jun 6 17:18:03 2006
Дата индексирования: Tue Oct 2 05:17:54 2012
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Поисковые слова: lightning

stecf.impol - an IRAF Imaging Polarimetry Reduction Package

The impol package consists of five tasks to reduce, simulate and plot imaging linear polarimetry data taken with the HST instruments with polarizing facilities - currently FOC, NICMOS and WFPC2. The tasks are written to require minimum user interaction so that specialist knowledge is not required to produce scientifically useful polarization results. Starting from well-aligned input images, along with statistical error maps, images of the total signal (Stokes parameter I), the normalized Stokes parameters Q/I and U/I, the linear polarization and position angle of the E vector and their propagated errors are produced.

 

Figure: An example of the output from stecf.impol showing polarization vectors plotted on an HST WFPC2 F673N filter image of the Homunculus nebula surrounding $\eta$ Carinæ.