I am reading a book about storms in space, this all stuff about electron, ions, coming and going is a little confusing, the author share us his poem for easily understanding. When I am reading other chapters about magnetopause and magnetotail and etc, I go back and read it again, it does help. :)
Storms in Space said:Lost in Space?
If ever you're lost
in the reaches of space,
a friendly charged particle
will find you your place.
In an upward field
of magnetic type,
electrons turn left
and protons turn right.
In a westward field,
an electric beast,
protons head west
and electrons east.
Combine the two fields
and believe it or not,
electron or proton
toward Earth is your lot.
So follow an ion
electron or two,
and I'm sure you'll know
just what to do.