BS ISO 20785-4:2019 pdf free.Dosimetry for exposures to cosmic radiation in civilian aircraft.
standard barometric altitude pressure altitude altitude determined by a barometric altimeter calibrated with reference to the International Standard Atmosphere [ISA) [ISO, 1975) when the altimeter’s datum is set to 1013,25 hPa Note 1 to entry: ISO Directives Part 2 requires ISO documents to use SI units and to comply with ISO 80000, so the default should be metres. However, in aviation, the flight level is mostly given as FLxxx, where xXx is a three- digit number representing multiples of 100 feet of pressure altitude, based on the ISA and a datum setting of 1013,25 hPa; for instance FL350 corresponds to 35 000 ft or, using 1 foot= 0,304 8 m, 10 668 m.Note 2 to entry: In its strict definition, the effective geomagnetic cut-off rigidity is not a lower threshold for particles to penetrate the magnetosphere; it lies within a rigidity interval in which charged particles can or cannot penetrate depending on the exact rigidity value. In the context of radiation exposure from GCR, the effective geomagnetic cut-off rigidity has proven to be a good measure for a lower threshold for the primary particle spectrum.period during which the solar activity varies with successive maxima separated by an average interval of about 11 years, usually defined in terms of relative sunspot number Note 1 to entry: If the reversal of the Sun’s magnetic field polarity in successive 11 year periods is taken into account, the complete solar cycle may be considered to average some 22 years, the Hale cycle.Note 1 to entry: The solar cycle in terms of the Wolf number has an approximate length of 11 years, but this varies between about 7 years and 17 years. An approximate 11-year cycle has been found or suggested in geomagnetism,  frequency of aurora, and other ionospheric characteristics. Note 2 to entry: The solar maximum corresponds to a minimum intensity in the GCR field.3.3.2 verification quality assurance process of determining whether or not the code fulfils the requirements and ensures that the code correctly models the desired data 3.3.3 validation comparison of the results of the code to experimental or reference data, in order to determine the accuracy or uncertainty.BS ISO 20785-4 pdf download.