I was trying to gather data to produce my own cosmic ray (CR) spectrum plot.
I have relied on this very useful French database collecting past space-based CR measurements. If I try to insert the keyword "AllParticleFlux" in the
Flux or ratio selection tab, I have 0 entries though.
Also looking in several plots of the literature CR spectra gathered by space-borne instruments, they are always sub-divided in the different elements they measure (figure from https://arxiv.org/abs/1711.11432).
So I was wondering, what are the main difficulties (if there are) in making an "all-particle" spectrum from space-borne CR experiments?
My sense is that it is related to the fact that the energy in space are measured (usually) combining a magnetic spectrometer and a calorimeter measurement. The range of velocities measurables (i.e. the range of deflections in the spectrometer measurable) varies with the charge of the particle (simple Larmor radius formula). Same for the calorimeter, different response for different particles.
One would not obtain events in the same energy bins for different species and this would complicate summing-up the excesses.
What do you think is the reason? Does anyone have a reference for an "all-particle" CR spectrum measured in space?