ASTM Spectra

Standardized Sun spectra at different airmasses

1347.9343199999998

import os

import matplotlib.pyplot as plt
import numpy as np

import mirage as mr
import mirage.vis as mrv

sun_spectra = np.loadtxt(
    os.path.join(os.environ['DATADIR'], 'ASTMG173.csv'), skiprows=2, delimiter=','
)
lambdas_nm = sun_spectra[:, 0]
sun_vacuum_w_per_m2_nm = sun_spectra[:, 1]
sun_global_w_per_m2_nm = sun_spectra[:, 2]
sun_direct_w_per_m2_nm = sun_spectra[:, 3]
ss_proof = mr.sun_spectrum(lambdas_nm)

i0 = np.trapz(sun_vacuum_w_per_m2_nm, lambdas_nm)
print(i0)
plt.plot(lambdas_nm, sun_vacuum_w_per_m2_nm)
plt.plot(lambdas_nm, sun_global_w_per_m2_nm)
plt.plot(lambdas_nm, sun_direct_w_per_m2_nm)
plt.plot(lambdas_nm, ss_proof)
mrv.texit(
    'Sun Irradiance Spectra',
    'Wavelength [nm]',
    r'$\left[ \frac{W}{m^2 \cdot m} \right]$',
    ['AM0', 'AM1.5 Global', 'AM1.5 Direct', 'PROOF zero airmass'],
)
plt.show()