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The past decade has seen a dramatic increase of practical applications of themicrowave gyrosynchrotron emission for plasma diagnostics and three-dimensionalmodeling of solar flares and other astrophysical objects. This break-throughturned out to become possible due to apparently minor, technical development ofFast Gyrosynchrotron Codes, which enormously reduced the computation timeneeded to calculate a single spectrum, while preserving accuracy of thecomputation. However, the available fast codes are limited in that they couldonly be used for a factorized distribution over the energy and pitch-angle,while the distributions of electrons over energy or pitch-angle are limited toa number of predefined analytical functions. In realistic simulations, theseassumptions do not hold; thus, the codes free from the mentioned limitationsare called for. To remedy this situation, we extended our fast codes to workwith an arbitrary input distribution function of radiating electrons. Weaccomplished this by implementing fast codes for a distribution functiondescribed by an arbitrary numerically-defined array. In addition, we removedseveral other limitations of the available fast codes and improved treatment ofthe free-free component. The Ultimate Fast Codes presented here allow for anarbitrary combination of the analytically and numerically defineddistributions, which offers the most flexible use of the fast codes. Weillustrate the code with a few simple examples.

Ultimate Fast Gyrosynchrotron Codes