The Eugene Parker Solar Probe has just launched
to investigate close up solar magnetic and electric fields.
In his book:
"Conversations on Electric and Magnetic Fields in the Cosmos"
Dr Parker notes:
a SI charge non 'mass, length and time' definition as coulomb
is a limitation for dimensional analysis of such EM problems.
One wonders if his 'mass, length and time' analysis
of such EM problems in cgs units system
provided him with scientific reasoning in regards to solar EM fields
deemed crazy by his peers at the time 50 years ago
but which are currently accepted as true
and the basis for his named solar probe.

Richard D Saam

[[Mod. note -- Actually, there's very little dimensional analysis in
Parker's 1958 paper. That paper can be read online (open-access!) at
http://adsabs.harvard.edu/full/1958ApJ...128..664P
-- jt]]