A daily average background X-ray flux in the 1 to 8
angstrom range. It is a midday minimum designed to reduce the
effects of FLAREs.
A temporary enhancement of the X-ray emission of the sun. The
time-intensity profile of soft X-ray bursts is similar to that of
the H-ALPHA profile of an associated FLARE.
X-RAY FLARE CLASS
Rank of a FLARE based on its X-ray energy output. Flares
are classified by the order of magnitude of the peak burst inten-
sity (I) measured at the earth in the 1 to 8 angstrom band as
Class (in Watt/sq. Meter)
B I less than (l.t.) 10.0E-06
C 10.0E-06 l.e.= I l.t.= 10.0E-05
M 10.0E-05 l.e.= I l.t.= 10.0E-04
X I g.e.= 10.0E-04