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Originally posted by pdomicioex
i'm new here ( new account like ) , but had been reading this solar watch thread and so then one thing passed on my mind.
one x-48 like pointed to the earth, like that 1859 ( this is the correct date?) , can shutdown an airplane in mid air?
pa: principal angle, counterclockwise from North (degrees)
da: angular width (degrees),
v: median velocity (km/s)
dv: variation (1 sigma) of velocity over the width of the CME
mindv: lowest velocity detected within the CME
maxdv: highest velocity detected within the CME
halo?: II if da>90, III if da>180, IV if da>270, indicating potential halo/partial halo CME
What i actually want to know is why there are sometimes cme's after solar flares and why not? and what causes the strength of a cme?