Index of /~jma/sec/events/2000_events
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Parent Directory 09-Aug-2006 17:31 -
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20000101events.txt 10-Mar-2005 10:56 1k
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May 12, 1998
NOTES from May 9, 1998:
The format of the Solar Event Lists was changed to include a standard
SEC style header. The format of the event record lines did not change.
A list of the current UT day is now available. It is updated every 30 minutes.
SOLAR EVENT LISTS
This directory contains daily preliminary lists of solar events. The solar
event reports received at SEL throughout the day are edited by the duty
forecaster to remove incomplete and duplicate reports. This list contains
one line for each event reported.
The list is updated every 30 minutes throughout the day. The lists for the
past 3 days are recreated daily between 0300 and 0330 UT to pick up any late
additions or changes.
A subset of these lists, called the "energetic" events is included in the
daily "Solar Geophysical Activity Summary (SGAS)" report and the
"Energetic Events" list in SEL's WEEKLY publication.
The sample list below shows typical event reports. The format is fixed,
80 columns wide, with standard headers. The fields are described below.
If no events are reported a single line is shown
NO EVENT REPORTS.
The SEC compiles this list from preliminary data as provided by the
contributing stations. Incorrect, missed, and incomplete reports are possible.
Your comments and suggestions are welcome.
Thank you,
Viola Raben
vraben@sec.noaa.gov
Sample Report
********************************************************************************
:Product: 19980511events.txt
:Created: 1998 May 11 2219 UT
:Date: 1998 05 11
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Environment Center.
# Please send comments and suggestions to sec@sec.noaa.gov
#
# Missing data: ////
#
# Edited Events for 1998 May 11
#
#Event Begin Max End Obs Q Type Loc/Frq Particulars Reg#
#-------------------------------------------------------------------------------
2560 A0146 //// 1225 HOL 3 DSF S17W71 22 B.0A
2580 0402 1452 1732 SVI U RNS 245 200
2540 0434 //// 1732 SVI C RSP 035-08 CTM/2
2520 + 0854 0903 0910 GO9 5 XRA 1-8A B6.9 5.6E-04
2530 + 1037 1047 1110 SVI 3 FLA S22E05 1F ERU 8218
2530 + 1041 1047 1052 GO9 5 XRA 1-8A B9.6 4.8E-04 8218
2550 + 1254 1317 1334 GO9 5 XRA 1-8A B8.4 1.7E-03
2580 1403 1403 1404 SAG G RNS 410 58
2570 + 1856 1900 1907 GO9 5 XRA 1-8A B5.6 3.2E-04 8218
2570 1858 1901 1912 HOL 3 FLA S21E03 SF 8218
2570 1858 1902 1914 RAM 3 FLA S22E02 SF 8218
********************************************************************************
The first line is the filename.
The second line indicates the date/time the list was created.
The third line contains the date of the data. Each file (list) contains one
UT day of data.
Event - This is an arbitrary event number assigned by SEL. It groups several
reports into a single event, as determined by the SEL forecaster.
+ - A plus sign (+) after the event number indicates that more than one
report was received for this event, and the forecaster has selected
this report to represent those received.
Begin, Max, End -
The UT Time (UT) of the beginning, maximum, and end of the event as
reported by the observing site. "////" indicates a missing time. The
UT day of the event's begin time is the UT day of the list. The UT day
of the maximum and/or end times may or may not be the same as the begin
time. Most solar events are several hours in duration. If the maximum
or end time is less than the begin time, then assume the times are for
the next UT day. A single letter can proceed a Begin, Max, or End time.
A=after, B=before, U=uncertain. For example the begin time A0146 means
the event began after 0146.
The begin time of an x-ray event is defined as the first minute, in a
sequence of 4 minutes, of steep monotonic increase in 0.1-0.8 nm flux.
The x-ray event maximum is taken as the minute of the peak x-ray flux.
The end time is the time when the flux level decays to a point halfway
between the maximum flux and the pre-flare background level.
Obs - The reporting observatory.
CUL - Culgoora, Australia GO7, GO8, GO9 - GOES 7, 8, or 9 satellites
HOL - Holloman AFB, NM, USA LEA - Learmonth, Australia
PAL - Palahua, HI, USA RAM - Ramey AFB, PR, USA
SAG - Sagamore Hill, PA, USA SVI - San Vito, Italy
(See the "Station Lists" directory in the "Welcome" directory for
more information.)
Q - Quality
For radio bursts at fixed and sweep frequencies, and for storms, this
shows the quality of the data
C = Corrected report
G = Good
U = Uncertain
For optical flares, this shows the quality of observing conditions,
from 1 to 5, where: 1 = very poor and 5 = excellent
X-ray events have a quality of 5 (meaning excellent).
Type - Type of report, (see the Glossary in the "Welcome" directory for
definitions).
BSL = Bright surge on the limb
DSF = Filament disappearance
EPL = Eruptive prominence on the limb
FIL = Filament
FLA = Optical flare observed in H-alpha
FOR = Forbush decrease (cosmic ray decrease))
GLE = Ground-level event (cosmic ray increase)
LPS = Loop prominence system
PCA = Polar cap absorption
RBR = Fixed-frequency radio burst
RNS = Radio Noise Storm
RSP = Sweep-frequency radio burst
XRA = X-ray flare
Loc/Frq - Location or frequency.
Location is in degrees latitude, north or south, and degrees longitude,
east or west, from central meridian. The location is the spherical,
heliographic coordinates of the solar region, as a distance in degrees
from a line extending from the solar equator (heliographic latitude),
and distance in degrees from a line extending from the north solar
rotational pole to the south solar rotational pole through the center
of the solar disk, as viewed from Earth (central meridian) in H-alpha.
Frequencies are in Mhz.
Particulars - Additional information from the report, chosen on the basis of
the report type.
XRA: X-ray Class
Class x = peak flux in the 0.1 to 0.8 nm range
In mks system In cgs system
Wm-2 cm-2 s-1
A < x 10-7 x 10-4
B 10-7 <= x 10-6 10-4 <= x 10-3
C 10-6 <= x 10-6 10-3 <= x 10-2
M 10-5 <= x 10-6 10-2 <= x 10-1
X 10-4 <= x 10-1 <= x
Integrated flux from start to end, in joules m E-2.
FLA: Importance and brightness
Importance is the corrected area of the flare in heliospheric
square degrees at maximum brightness, observed in the H-alpha
line (656.3 nm).
S - Subflare (area < or =2.0 square degrees).
1 - Importance 1 ( 2.1 <= area <= 5.1 square degrees)
2 - Importance 2 ( 5.2 <= area <= 12.4 square degrees)
3 - Importance 3 (12.5 <= area <= 24.7 square degrees)
4 - Importance 4 ( area >= 24.8 square degrees)
Brightness is the relative maximum brightness of flare in H-alpha.
F - faint N - normal B - brilliant
Flare Characteristics
VWL = Visible in white light
UMB = Greater than or equal to 20 percent umbral coverage
PRB = Parallel ribbon
LPS = Associated Loop Prominence (LPS)
YSR = Y-shaped ribbon
ERU = Several eruptive centers
BPT = One or more brilliant points
HSS = Associated high speed dark or bright surge
DSF = Flare followed the disappearance of a solar filament in the
same region
BLU = H-alpha emission greater in the blue wing than in the red wing
RBR:
The peak value above pre-burst background of associated radio bursts
at frequencies 245, 410, 610, 1415, 2695, 4995, 8800 and 15400 MHz:
1 flux unit = 10-22 Wm-2 Hz-1
RSP:
The intensity is a relative scale from 1 (low) to 3 (high) of
any sweep radio event associated with the energetic event, as follows
Type II: Slow drift burst
Type III: Fast drift burst
Type IV: Broadband smooth continuum burst
Type V: Brief continuum burst, generally associated with Type III
bursts
Type CTM: Broadband, long-lived, dekametric continuum
Reg# - The SEL-assigned solar region number. The daily SEL Solar Region
Summary report contains detailed information about solar regions.