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: http://www.naic.edu/~rminchin/idl/rotang.shtml
Дата изменения: Unknown Дата индексирования: Sun Apr 10 04:18:47 2016 Кодировка: Поисковые слова: lightning |
Rotang can either be run from the command line as described here or through the alfa_ang GUI. This documentation covers the basic options that a user will normally require, the detailed documentation contains a description of other parameters not covered here, including the output parameters, and of the minimisation algorithm.
To run rotang at Arecibo:
Here Date takes the format YYMMDD (e.g. 041128 for the 28th of November, 2004). RA takes the format HHMMSS (e.g. 093210 for 09:32:10) and is in J2000 coordinates. Dec takes the format DDMMSS (eg 212003 for 21:20:03) and is in J2000 coordinates. Time takes the format HHMMSS (e.g. 063000 for 06:30, or -003000 for -0.5 hours). /choice is one of /ha (for Hour Angle), /lst (for Local Sideral Time) or /ast (for Atlantic Standard Time) and defines what Time refers to, e.g. rotang,041128,093210,212003,063000,/ast is asking for the best angle at 06:30 AST on 04-11-28 while rotang,041128,093210,212003,-003000,/ha is asking for the best angle at an hour angle of -0.5 hrs on the same day, and rotang,041128,093210,212003,090000,/lst is asking for the best angle at 09:00 LST.
Rotang also calculates the Azimuth and Zenith Angle fir every source. If the Zenith Angle is greater than 20 degrees, then the program will return that the source is down and will not calculate an optimum ALFA angle. If the source is above 20 degrees, it will return the optimum angle and the mean beam separation that this angle will give as well as full positional information for all of the seven beams, as shown below:
Date (YYMMDD): 41128 jd LST AST HA az za angle sep 2453337.937 10:33:38 6:30: 0 + 1: 1:11 103.92 14.69 -81.2 1.80 Beam dAz dZA AZ ZA RA Dec dRA dDec 0 0.0 0.0 103.925 14.692 9.536 21.334 0.00 0.00 1 -306.8 -138.9 104.260 14.730 9.534 21.424 -6.32 5.41 2 -50.3 -379.5 103.979 14.797 9.529 21.364 -26.24 1.80 3 256.4 -240.6 103.645 14.759 9.531 21.274 -19.81 -3.61 4 306.8 138.9 103.588 14.653 9.538 21.244 6.43 -5.42 5 50.3 379.5 103.869 14.586 9.543 21.304 26.23 -1.81 6 -256.4 240.6 104.207 14.625 9.542 21.394 19.92 3.60
Rotang was written by Robert Minchin and incorporates code from Phil Perilat and from the Cornell EGG. It relies on the aoidl routines written by Phil Perilat.