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1992-07-30
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27KB
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510 lines
UNDERSTANDING THE DAILY SOLAR GEOPHYSICAL DATA BROADCAST
--------------------------------------------------------
Revision 1.02
The Solar Terrestrial Dispatch (STD) has been providing a daily
broadcast of solar and geophysical indices and other data over the electronic
networks.
Computer software (in MSDOS format) to automatically extract the data in
these daily reports, archive it, and/or graphically analyze it, is available
through anonymous FTP or from our computer BBS system. For those with FTP
capabilities, you may obtain this software under the filename "BCAST102.ZIP"
from one of the following sites:
- solar.stanford.edu, in the "pub/Software" directory.
- nic.funet.fi, in the "pub/dx/software/msdos/solar" directory.
- wsmr-simtel20.army.mil, in the directory: "pd1:<msdos.database>"
- wuarchive.wustl.edu, in the directory: "mirrors/msdos/database"
The software may also be freely downloaded from our computer BBS system by
dialing: (403) 756-3008. You will find BCAST102.ZIP in the Utilities file
section of the BBS.
A sample broadcast message follows below. This sample broadcast data
set will be fully described in this document.
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 248, 09/05/91
10.7 FLUX=163.5 90-AVG=206 SSN=204 BKI=5454 3323 BAI=025
BGND-XRAY=B8.6 FLU1=2.7E+05 FLU10=8.3E+03 PKI=5454 4333 PAI=029
BOU-DEV=093,051,073,060,023,030,012,021 DEV-AVG=045 NT SWF=05:079
XRAY-MAX= M4.4 @ 0111UT XRAY-MIN= B8.0 @ 0914UT XRAY-AVG= C2.5
NEUTN-MAX= +003% @ 2250UT NEUTN-MIN= -002% @ 1700UT NEUTN-AVG= +0.5%
PCA-MAX= +0.7DB @ 1425UT PCA-MIN= -0.2DB @ 2325UT PCA-AVG= -0.1DB
BOUTF-MAX=55331NT @ 2250UT BOUTF-MIN=55263NT @ 1649UT BOUTF-AVG=55301NT
GOES7-MAX=E:+113NT@ 0607UT GOES7-MIN=N:-052NT@ 0911UT G7-AVG=+067,+063,+002
GOES6-MAX=P:+101NT@ 1925UT GOES6-MIN=N:-010NT@ 1439UT G6-AVG=+073,+026,+014
FLUXFCST=STD:160,157,155 ; SESC:160,155,150 BAI/PAI-FCST=15,10,10 / 15,15,18
KFCST=3344 5433 2334 4211 27DAY-AP=019,011 27DAY-KP=2333 4333 2233 2322
WARNINGS=*MAJFLR;*PROTON
ALERTS=**MAJFLR:X1.1/2B,N20E29(6857),0523-0555-0641,II=2@0551,IV=3@0602;
**MINFLR:M4.4@0111;**MINFLR:M2.3@0528;**MINFLR:M1.6@1209;
**TENFLR:2200,DUR:N/A
!!END-DATA!!
LINE 01
-------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 248, 09/05/91
!!BEGIN!! : Signifies the start of the report, for computer-controlled
extraction of the data.
(1.0) : Represents the version number of the data set. The
appropriate software with the same version number must
be used to extract and interpret the data sets.
DAY 248 : The day of the year for the report.
09/05/91 : Equivalent Month/Day/Year of the report.
LINE 02
-------
10.7 FLUX=164.5 90-AVG=206 SSN=204 BKI=5454 3323 BAI=025
10.7 FLUX=164.5 : The 10.7 cm solar radio flux as reported by the
NRC-Dominion Radio Astrophysical Observatory (DRAO) in
Penticton, British Columbia, Canada (formerly produced
by the Algonquin Radio Observatory in Ottawa).
90-AVG=206 : This value represents the 90-day average 10.7 cm solar
radio flux.
SSN=204 : This value is the observed sunspot number as observed by
Mt. Wilson Solar Observatory and reported by NOAA.
BKI=5454 3323 : These digits represent the 8 three-hourly Boulder K-indices
as observed by the Boulder USGS magnetometer. The first
digit represents the observed K-index for the period from
00:00 UT to 02:59 UT. The second digit represents the
observed K-index from 03:00 to 05:59 UT, and so forth.
If data is unavailable, it is replaced with an asterisk.
BAI=025 : This value is the observed 24:00 UT Boulder A-Index for
Boulder, Colorado.
LINE 03
-------
BGND-XRAY=B8.6 FLU1=2.7E+05 FLU10=8.3E+03 PKI=5454 4333 PAI=029
BGND-XRAY=B8.6 : This is the background x-ray flux value as reported by the
Space Environment Laboratories. This value is produced by
observing the background x-ray emissions in the soft-xray
band (1 to 8 Angstroms). Consult the "Glossary of Solar
Terrestrial Terms" as produced by the STD for information
on understanding the x-ray classification scheme. This
document is available for anonymous FTP from the site:
"solar.stanford.edu" in "/pub", or on "nic.funet.fi".
FLU1=2.7E+05 : This value is the observed proton fluence at greater than
1 MeV (million electron volts).
FLU10=8.3E+03 : This is the observed proton fluence at greater than 10 MeV.
PKI=5454 4333 : These digits represent the 8 three-hourly estimated
planetary K-index values for the UT day. The format is
the same as is used for the Boulder K-indices noted above.
PAI=029 : This value represents the estimated planetary A-index value
for the UT day. Occassionally, this value is not available
at the time the data set is compiled. If this is the case,
a preliminary calculation is made to estimate the planetary
A-index value using the planetary K-indices. Although this
will not produce an officially accurate result, the results
calculated in this way are usually accurate to +/- 2 points.
LINE 04
-------
BOU-DEV=093,051,073,060,023,030,012,021 DEV-AVG=045 NT SWF=05:079
BOU-DEV=093,051,073,060,023,030,012,021
These values represent the observed maximum deviation in
the Boulder USGS magnetometer. The values are in nano-
tesla (nT, or reported as "NT" elsewhere in the report).
The first value represents the observed maximum deviation
of the geomagnetic field (using the most disturbed magnetic
component) during the period 00:00 UT to 02:59 UT. In this
example, the maximum deviation observed was 93 nT between
00:00 UT and 02:59 UT. The second value represents the
maximum deviation between 03:00 UT and 05:59 UT. Each of
these values correspond to the observed Boulder K-index
as reported on line 2 of this daily report.
DEV-AVG=045 NT : This value represents the average daily maximum deviation
of the Boulder magnetometer, given in units of nanotesla
(or NT). It is produced by simply averaging the 8
three-hourly maximum deviation values given on this line.
SWF=05:79 : The first value (05) represents the number of possible
episodes of Short Wave Fades (SWFs) observed during the
UT day. Short wave fading is simply a period of time when
the absorption of High Frequency (HF) radio waves increases
which produces a decrease in signal strengths of HF signals
OVER SUNLIT AREAS. In other words, this value represents
the approximate maximum number of times HF signals may have
faded out during the UT day. It is important to note that
SWFs are the strongest over the low and middle latitudes
and are ONLY observed during the daylight hours, preferably
when the sun is higher in the sky.
The second value (79) represents the estimated maximum
number of minutes that solar-flare activity may have
produced observed SWFs. In this exam