A number of groups are working on novel detection systems. They all in some way or other take advantage of radiation effects. The advantages of these are that they are generally very light and cheap. The monitors would allow low-cost augmentation of the data from the high fidelity detector, giving added spatial and temporal data. A further high fidelity detector should fly in polar orbit, again with a monitor on one or two other polar orbiters, with different orbital planes and phases.
Space station is also important and is even closer to the atmosphere.
It samples the low altitude anisotropy but also clips the outer zone providing useful measurements for correlation. Combinations of monitors and high-fidelity instruments can be envisaged. In addition mapping of internal shielding effects can be undertaken. Equatorial or inclined MEO and inclined HEO are also useful and monitors should fly in these orbits, possibly on commercial and other carriers. Nano-satellites, where an autonomous spacecraft is built around the instrument itself, which continuously measures and transmits its data.