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Ground level spectral irradiance at hourly intervals

Source: R/example.solar.spectra.data.r
sun_hourly_august.spct.Rd

Datasets containing the wavelengths at 1.0 nm interval and tabulated values of spectral irradiance for the sun for 21 and 22 August in Helsinki, Finland.

Usage

sun_hourly_august.spct

Format

A source_spct containing 31 spectra in long form (293 nm to 800 nm at 1 nm interval) and 4 variables w.length, s.e.irrad, UTC, and spct.idx.

Details

The variables are as follows:

  • w.length numeric (nm)

  • s.e.irrad numeric (W m-2 nm-1)

  • UTC POSIXct (UTC date and time)

  • spct.idx factor with one level per spectrum

The data set includes NAs for missing night-time spectral irradiance values.

Note

The simualtion methods has been described in Lindfors et al. (2009).

References

Lindfors, A.; Heikkilä, A.; Kaurola, J.; Koskela, T. & Lakkala, K. (2009) Reconstruction of Solar Spectral Surface UV Irradiances Using Radiative Transfer Simulations. Photochemistry and Photobiology, 85: 1233-1239

Author

Anders K. Lindfors (radiation transfer modelling)

Examples

e_irrad(sun_hourly_august.spct)
#> # A tibble: 31 × 3
#>    E_Total spct.idx when.measured      
#>      <dbl> <chr>    <dttm>             
#>  1    20.6 spct.01  2014-08-21 03:30:00
#>  2    36.4 spct.02  2014-08-21 04:30:00
#>  3   120.  spct.03  2014-08-21 05:30:00
#>  4   166.  spct.04  2014-08-21 06:30:00
#>  5   115.  spct.05  2014-08-21 07:30:00
#>  6   267.  spct.06  2014-08-21 08:30:00
#>  7   399.  spct.07  2014-08-21 09:30:00
#>  8   405.  spct.08  2014-08-21 10:30:00
#>  9   315.  spct.09  2014-08-21 11:30:00
#> 10   269.  spct.10  2014-08-21 12:30:00
#> # ℹ 21 more rows
wl_range(sun_hourly_august.spct)
#> [1] 290 800
getMultipleWl(sun_hourly_august.spct) # number of spectra
#> [1] 31