Detailed solar spectrum wanted

[GreatAttractor]

Does anyone know where I can find a detailed/tabulated (say, at 1-5 nm steps) solar irradiance (spectral) data at sea level? Something corresponding to this low-resolution image here:

[george9]

I don't have the link right here but perhaps search for BASS2000. George

[GreatAttractor]

Perfect, thank you! Exactly what I needed. The data is here (web interface with textual export functionality): https://bass2000.obspm.fr/solar_spect.php

[christian viladrich]

For solar irradiance, it might be better to use this :
https://www.nrel.gov/grid/solar-resource/spectra.html

It is given for sea-level (1.5 airmass), and also on top of Earth atmosphere.
This is the source for the graph you gave.

But it all depends on what you need exactly.

[GreatAttractor]

Thank you, Christian, I'll check that out.

I've been thinking about some potential CaK modding, and wanted to do some initial calculations of how much light a setup will provide. I figured I can get a good idea by combining these data:

- solar irradiance (provided here)
- detailed QE curve of my sensor (found online)
- transmission curves of the Barr Associates final filter in a Lunt CaK module, and of Solar Continuum (both already measured and published here on SolarChat)
- shutter and gain values I use in my sessions for the above filters, at specific F-ratios and telescope type

[christian viladrich]

Ok, I see. Probably the iradiance (ASTM) is more usefull for this.
This is the data I used to calculate the amount of energy transmitted by various ERF configurations.

On the other hand, in order to calculate the contrast (or selectivity) of a SS, DS, TS combination, I used the BAS2000 solar spectrum :
http://astrosurf.com/viladrich/astro/in ... ntrast.htm