[Ips-flare-alert] IPS flare alert correction
rwc
rwc at ips.gov.au
Wed Oct 29 09:16:55 EST 2014
Hi IPS flare alert customers,
This alert message below is obviously incorrect, input data corruption
at some stage appears to have caused the problem.
IPS FLARE ALERT - PART C
PRELIMINARY FLARE DETAILS AT END OF FLARE
ISSUE TIME: Mon Oct 27 12:28:20 UTC 2014
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Approximate Flare Start : 27-10-2014 0900 UT
Approximate Flare Maximum: 27-10-2014 1029 UT at Flux X45500.0
Approximate Flare End : 27-10-2014 1226 UT
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>From the xray flux values at the time of the data corruption:
YYYY MM DD HHMM xray flux value
2014 10 27 1029 4.55e-05 (this is an M4.55 or M4.6 xray flux flare)
>From the message that went out it appears that the order of magnitude is
wrong (almost as though the plus became a plus in the floating point
notation or more likely the number was truncated and e-05 part wasnt read in),
hence the X45500.0. This means we shall have to add a test to try and reject
flux values that are obviously out of range.
Further review of data shows the correct flare maximum actually occured earlier at:
YYYY MM DD HHMM xray flux value
2014 10 27 1009 6.79e-05 (M6.8)
The alert message then should have been:
IPS FLARE ALERT - PART C
PRELIMINARY FLARE DETAILS AT END OF FLARE
ISSUE TIME: Mon Oct 27 12:28:20 UTC 2014
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Approximate Flare Start : 27-10-2014 0900 UT
Approximate Flare Maximum: 27-10-2014 1009 UT at Flux M6.8
Approximate Flare End : 27-10-2014 1226 UT
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Apologies.
IPS
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