What is ISO 12208- Selection of confidence level in a statistical model of solar proton fluences about?  
ISO 12208 describes a method to estimate energetic proton fluences in geosynchronous earth orbit (GEO) over a long duration (beyond the 11-year solar cycle) and presents guidelines for the selection of a confidence level in a model of solar proton fluences to estimate solar cell degradation.
Many of the proton data observed in GEO are archived, for example from GMS (Japan), METEOSAT (ESA), and GOES (USA). This method is direct integration of these fluence data (or the observed data over 11 years is used periodically). As a result, the confidence level can be selected from a model of solar proton fluences.
Who is ISO 12208- Selection of confidence level in a statistical model of solar proton fluences for? 
ISO 12208 on the selection of confidence level in a statistical model of solar proton fluences is useful for: 
- Spacecraft and space products manufacturers         
- Aerospace products manufacturers   
- Testing agencies involved in the inspection of spacecraft and aerospace products         
- Quality control personnel for spacecraft products      
- Aeronautical engineers 
- Space researchers
Why should you use ISO 12208- Selection of confidence level in a statistical model of solar proton fluences?  
ISO 12208 is intended for use in the engineering community. It is well known that solar energetic protons (SEPs) damage spacecraft systems, i.e., electronics and solar cells, through ionization and/or atomic displacement processes. This results in single-event upsets and latch‑ups in electronics, and output degradation of solar cells.
Galactic cosmic rays can be ignored since their fluence is very small and trapped protons can be absorbed by the cover glass. Therefore, solar energetic protons are the only factor and can be estimated by the method in ISO 12208 and/or statistical models ISO 12208 is an engineering-oriented method used for specific purposes such as estimating solar panel degradation.
