/usr/lib/python2.7/dist-packages/Pysolar/radiation.py is in python-pysolar 0.6-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | #!/usr/bin/python
# Copyright Brandon Stafford
#
# This file is part of Pysolar.
#
# Pysolar is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Pysolar is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with Pysolar. If not, see <http://www.gnu.org/licenses/>.
"""Calculate different kinds of radiation components via default values
"""
#from . import solar
import math
def GetAirMassRatio(altitude_deg):
# from Masters, p. 412
# warning: pukes on input of zero
return (1/math.sin(math.radians(altitude_deg)))
def GetApparentExtraterrestrialFlux(day):
# from Masters, p. 412
return 1160 + (75 * math.sin(math.radians((360./365) * (day - 275))))
def GetOpticalDepth(day):
# from Masters, p. 412
return 0.174 + (0.035 * math.sin(math.radians((360./365) * (day - 100))))
def GetRadiationDirect(utc_datetime, altitude_deg):
# from Masters, p. 412
if(altitude_deg > 0):
day = solar.GetDayOfYear(utc_datetime)
flux = GetApparentExtraterrestrialFlux(day)
optical_depth = GetOpticalDepth(day)
air_mass_ratio = GetAirMassRatio(altitude_deg)
return flux * math.exp(-1 * optical_depth * air_mass_ratio)
else:
return 0.0
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