19 Jun
2012
19 Jun
'12
6:13 a.m.
Very true, although this solar max has been a rather wimpy one. I can't remember seeing a prominence that truly lasted more than a half hour, this time around. On Mon, Jun 18, 2012 at 11:29 PM, Siegfried Jachmann <siegfried@jachmann.org
wrote:
Prominences may change appearence over minutes but they can last for hours.