refractiveidx
Calculation of the refractive index.
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Syntax
Function call
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ridx,N = refractiveidx(h;Name=Value)— calculates the refractive index and refrangibility with additional parameters specified by one or more arguments of the type «name-value».
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refractiveidx(___;out=:plot)— plots the refractive index as a function of altitude in kilometers.
Arguments
Input arguments
# h — geometric heights
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vector
Details
Geometric heights corresponding to the height above mean sea level in meters, set as a vector string.
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Input arguments «name-value»
Specify optional argument pairs in the format Name = Value, where Name — the name of the argument, and Value — the appropriate value. Type arguments «name-value» they should be placed after the other arguments, but the order of the pairs does not matter.
Example: refractiveidx(h; LatitudeModel = "Mid", Season = "Winter") sets the model of mid-latitudes in winter.
# WaterVaporDensity — standard absolute humidity at ground level
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7.5 (by default) | scalar
Details
The standard absolute humidity at ground level in g/m 3, given as a scalar.
To use this argument, set for the argument LatitudeModel meaning "Standard".
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# ScaleHeight — height scale
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2.0e3 (by default) | scalar
Details
The height scale in meters, set as a scalar.
To use this argument, set for the argument LatitudeModel meaning "Standard". In a dry atmosphere, set this argument to 6.0e3 m.
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# LatitudeModel — Latitude reference model
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"Standard" (by default) | "Low" | "Mid" | "High"
Details
The reference model of latitude, set as one of the following values:
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"Standard"— The model represents the Standard Global Atmosphere (MAGRA), characterized by annual averages of temperature and pressure around the globe. -
"Low"— the model is designed for low latitudes less than22degrees, where seasonal fluctuations are insignificant. -
"Mid"— the model is designed for mid-latitudes from22before45degrees with seasonal profiles for values"Summer"and"Winter", set using the argumentSeason. -
"High"— the model is designed for higher latitudes than45degrees with seasonal profiles for values"Summer"and"Winter", set using the argumentSeason.
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# Season — seasonal profile
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"Summer" (by default) | "Winter"
Details
Seasonal profile for latitude models "Mid" and "High", set as "Summer" or "Winter". Other latitude models ignore this argument.
# Atmospheremeasuries — Custom atmospheric measurements
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the matrix
Details
Custom atmospheric measurements for calculating refractive index ridx, defined as a matrix of size on , where — the number of height measurements. The first column of the matrix is the atmospheric temperature in kelvin, the second column is atmospheric pressure in gPa, the third column is absolute humidity in g/m3, and the fourth column is the measurement altitude above mean sea level in meters, indicated in ascending order. When using a custom model, all other arguments are of the type «name-value» are ignored, and the output refractive index is ridx applies to the entrance height h.
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# out — type of output data
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:data (default) | :plot
Details
Type of output data:
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:data— the function returns data; -
:plot— the function returns a graph.
Examples
Calculation of the refractive index and refrangibility
Details
Calculate the refractive index and refrangibility at height 20 km, using the mid-latitude model in winter.
import EngeePhased.Functions: refractiveidx
h = 20e3
ridx, N = refractiveidx(h, LatitudeModel = "Mid", Season = "Winter")
println("ridx = ", ridx, "\nN = ", N)ridx = 1.00002119612079
N = 21.196120790095854