The best ones, in my preference, are those which
are detonated above the ground where the fireball
can be clearly discerned not-incorporating the dust
and earth thrown up by the ground detonations.
For more information on the how & why's of
this facinating subject, click
here, also contains loads of other info.
Each of the thumbnail
images leads to a larger image.
All images have been found
in the public domain and therefore assumed that no copyright
has been infringed by displaying them here.