>> For x-ray events:
>>
>> The event starts when 4 consecutive 1-minute Xray long values have met all
>> three of the following conditions
>>
>>      a.      All 4 values are above the B1 threshold    AND
>>      b.      All 4 values are strictly increasing    AND
>>      c.      The last value is greater than 1.4 times the value which
>> occurred 3 minutes earlier
>>
>>
>> The maximum is the time when the flux value reaches maximum.  The maximum
>> flux value (the event size) is the flux, as defined by the C-M-X scale, at
>> the time of maximum.
>>
>> The event ends when the current flux reading returns to 1/2 the 'peak' (peak
>> is the sum of the flux at maximum plus the flux value at the start of the
>> event).

Received from Joe Hirman (jhirman@sec.noaa.gov), September 1999