[Ips-msgr] IPS Monthly Report - April 01
rwc
rwc at ips.gov.au
Thu May 3 12:04:12 EST 2001
SUBJ: IPS MONTHLY SUMMARY - APRIL 2001
ISSUED BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
1. SOLAR-GEOPHYSICAL INDICES
SOLAR AUST AUST
Day 10 cm flux A-INDEX T INDEX
01-Apr 258 25 89
02-Apr 228 16 148
03-Apr 223 6 164
04-Apr 205 17 162
05-Apr 210 12 168
06-Apr 192 12 153
07-Apr 180 18 155
08-Apr 169 33 152
09-Apr 165 15 131
10-Apr 170 8 131
11-Apr 160 51 120
12-Apr 149 25 70
13-Apr 137 31 134
14-Apr 139 15 94
15-Apr 134 8 119
16-Apr 123 5 132
17-Apr 126 5 126
18-Apr 132 25 123
19-Apr 145 6 133
20-Apr 180 4 123
21-Apr 191 6 133
22-Apr 193 21 126
23-Apr 196 10 73
24-Apr 194 7 117
25-Apr 194 5 126
26-Apr 196 6 138
27-Apr 191 4 132
28-Apr 188 24 136
29-Apr 192 10 137
30-Apr 188 1 136
10 CM SUNSPOT SUNSPOT AUST AUST No of
FLUX NUMBER NUMBER A-INDEX T INDEX FLARES
Monthly Monthly Yearly Monthly Monthly >M1.0
Month Average Average Average Average Average
Apr 00 184.2 125.3 120.7 10.3 154.9 11
May 00 184.5 120.8 118.9 9.7 138.7 20
Jun 00 178.8 124.9 118.6 10.0 133.5 24
Jul 00 200.0 169.1 119.6 12.8 147.3 54
Aug 00 163.1 130.5 118.4 10.7 145.9 3
Sep 00 182.1 109.9 116.1 0.0 0.0 0
Oct 00 167.8 100.1 114.4 12.0 133.4 11
Nov 00 178.8 106.5 113.5p 14.4 135.4 23
Dec 00 173.0 104.5 112.9p 8.2 143.0 7
Jan 01 166.7 95.1 110.1p 8.4 139.2 8
Feb 01 147.3 80.1 107.0p 7.0 137.2 1
Mar 01 177.7 114.2 106.3p 14.0 142.6 36
Apr 01 178.3 108.2 106.7p 14.4 129.4 45
Monthly T indices
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1992 153 173 155 134 96 80 88 67 69 67 85 90
1993 75 78 80 64 63 65 63 51 38 41 34 44
1994 57 41 43 26 16 15 23 18 21 21 21 21
1995 25 34 23 13 4 12 13 11 13 10 13 8
1996 12 8 5 2 6 3 3 5 4 4 11 15
1997 14 11 11 9 12 6 9 18 33 28 28 39
1998 41 42 44* 57 45 57 78* 76* 89 71 75 94
1999 95* 82 90 79 99 125 126* 107* 90* 92* 124* 115*
2000 109 121 161 156 135 134 149 139 124 133* 142 157
2001 140 140 121^ 119^ 117^ 113^ 109^ 105^ 103^ 103^ 102^ 100^
2002 99^ 97^ 95^ 93^ 91^ 89^ 86^ 84^ 81^ 79^ 76^ 74^
2003 71^ 69^ 66^ 64^ 61^ 59^ 57^ 54^ 52^ 49^ 47^ 45^
2004 43^ 41^ 39^ 37^ 35^ 33^ 31^ 29^ 28^ 26^ 24^ 23^
2005 21^ 20^ 19^ 17^ 16^ 15^ 14^ 13^ 12^ 11^ 10^ 9^
2006 8^ 8^ 7^ 6^ 6^ 5^ 5^ 5^ 4^ 4^ 4^ 4^
2007 4^ 5^ 5^ 6^ 7^ 8^ 9^ 11^ 13^ 16^ 18^ 21^
2008 25^ 28^ 32^ 36^ 41^ 45^ 50^ 54^ 59^ 64^ 68^ 73^
* = New data. T index may have changed.
^ = IPS predicted T index.
===============================================================================
2. FLARES AND SHORT-WAVE FADEOUTS
DATE CLASS M CLASS X FLARE FADEOUT POSSIBLE ON
FLARES FLARES MAX DAYLIGHT HF CIRCUIT
01 Apr 01 M5.5 1217UT 1055-1324UT
01 Apr 01 M4.0/1F 1949UT 1944-1956UT
01 Apr 01 M1.2 2301UT
02 Apr 01 M3.2/SF 0028UT 0014-0040UT
02 Apr 01 M1.9/SF 0952UT
02 Apr 01 X1.4 /1B 1014UT 1004-1020UT
02 Apr 01 X1.1 1136UT 1058-1205UT
02 Apr 01 X17.1 2151UT 2132-2203UT 2132-2203UT
03 Apr 01 X1.2 /1N 0357UT 0325-0455UT
03 Apr 01 M2.4/2F 1234UT
03 Apr 01 M1.1 2351UT
04 Apr 01 M1.6/SF 1027UT
04 Apr 01 M1.1/SF 1159UT
04 Apr 01 M2.0 1222UT
04 Apr 01 M1.1 2351UT
05 Apr 01 M3.1 0220UT 0200-0311UT
05 Apr 01 M1.1 0518UT
05 Apr 01 M1.2/SN 0834UT
05 Apr 01 M8.4 0922UT 0837-0954UT
05 Apr 01 M5.1/2N 1725UT 1657-1814UT
06 Apr 01 X5.6 /SF 1921UT 1910-1931UT 1910-1931UT
09 Apr 01 M7.9/2B 1534UT 1520-1600UT
10 Apr 01 X2.3 /3B 0526UT 0506-0542UT
11 Apr 01 M1.0 0031UT
11 Apr 01 M2.3/1F 1326UT
12 Apr 01 M1.3/1N 0304UT
12 Apr 01 X2.0 /SF 1028UT 0939-1049UT
14 Apr 01 M1.0/SF 1811UT
15 Apr 01 X14.4 /2B 1350UT 1319-1355UT 1319-1355UT
16 Apr 01 M1.1 0622UT
17 Apr 01 M1.3 2157UT
19 Apr 01 M2.0 1135UT
20 Apr 01 M1.0/1F 0523UT
20 Apr 01 M4.1/1F 2004UT 1951-2016UT
22 Apr 01 M3.2/1N 2044UT 2037-2047UT
23 Apr 01 M1.0/1F 0128UT
23 Apr 01 M4.0/2N 2030UT 2015-2043UT
24 Apr 01 M2.1/1N 0542UT
24 Apr 01 M3.1/1F 0700UT 0653-0708UT
24 Apr 01 M1.6/1N 1253UT
24 Apr 01 M2.3/1N 1812UT
24 Apr 01 M1.8/1N 2224UT
25 Apr 01 M2.7/2N 1348UT
26 Apr 01 M7.8/2B 1312UT 1126-1319UT
27 Apr 01 M1.2/1F 1915UT
2.1 Comments on Solar Activity.
Solar activity was at moderate to high levels this month. Flare
activity was sustained by solar region 9415, which was rotating
onto the south east limb of the disk, as the large flare active
region, 9393, rotated off the north western limb of the disk around
02-03 April. Region 9393 returned to the disk around 18 April
(as SEC region 9433) contributing further M class flares until
27 April. The largest flare(s) for the month were an X17 flare at
2151UT on 02 April from region 9393, and an X14 flare at 1350UT on
15 April from region 9415. There were 8 X class flares this month,
and a total 45 M and X class xray events. Several proton events
were observed and these are listed below:
10Mev Proton Events:
Began 03 04 2001 0015UT Ended 06 04 2001 1425UT
Began 06 04 2001 1450UT Ended 06 04 2001 1535UT
Began 10 04 2001 0930UT Ended 13 04 2001 1120UT
Began 15 04 2001 1405UT Ended 17 04 2001 1805UT
Began 18 04 2001 0330UT Ended 20 04 2001 1005UT
Began 28 04 2001 0440UT Ended 28 04 2001 0520UT
===============================================================================
3. GEOMAGNETIC DISTURBANCES (for Australian Region)
DATE COMMENTS
01 Apr 01: Quiet to Major Storm
02 Apr 01: Quiet to Active
04 Apr 01: Quiet to Minor Storm
07 Apr 01: Quiet to Active
08 Apr 01: Quiet to Major Storm
09 Apr 01: Unsettled to Active
11 Apr 01: Quiet until sudden commencement at 1440UT then severe storm.
12 Apr 01: Minor storm
13 Apr 01: Major storm
14 Apr 01: Quiet to Active
18 Apr 01: Major storm declining to unsettled.
22 Apr 01: Unsettled to Minor storm.
28 Apr 01: Quiet to Minor Storm
Frequent disturbed geomagnetic conditions were observed this month, due
to mass ejections associated with the increased flare activity. The
strongest disturbance was observed on 11 April. Auroral sightings
were reported during periods of strong geomagnetic activity.
===============================================================================
4. IONOSPHERIC DISTURBANCES (for Australian Region)
01 Apr 2001 Southern region MUFs depressed 50%
12 Apr 2001 Southern region MUFs depressed 30%
14 Apr 2001 Southern region MUFs depressed 30%
23 Apr 2001 Southern region MUFs depressed 30%
Strongly depressed MUFs were observed on 01, 12, 14, and 23 April,
following geomagnetic storm activity. Depressions were mostly
confined to mid to high latitudes. Also, high latitude/polar regions were
impacted by increased absorption due proton events associated
with some of this month's stronger flare events. Frequent shortwave
fadeouts were observed this month.
===============================================================================
5. IPS WARNINGS AND ALERTS ISSUED
WARNINGS:
HF RADIO WARNING:
ISSUE DATE NO BEGIN END
02 Apr 01 17 02 Apr 01 04 Apr 01
03 Apr 01 18 04 Apr 01 06 Apr 01
05 Apr 01 19 06 Apr 01 08 Apr 01
06 Apr 01 20 08 Apr 01 10 Apr 01
09 Apr 01 21 09 Apr 01 11 Apr 01
09 Apr 01 22 11 Apr 01 12 Apr 01
10 Apr 01 23 11 Apr 01 13 Apr 01
12 Apr 01 24 14 Apr 01 16 Apr 01
15 Apr 01 25 16 Apr 01 18 Apr 01
16 Apr 01 26 18 Apr 01 19 Apr 01
22 Apr 01 27 23 Apr 01 23 Apr 01
27 Apr 01 28 28 Apr 01 29 Apr 01
27 Apr 01 29 27 Apr 01 29 Apr 01
GEOMAGNETIC WARNING:
ISSUE DATE NO BEGIN END
03 Apr 01 10 04 Apr 01 05 Apr 01
06 Apr 01 11 08 Apr 01 10 Apr 01
09 Apr 01 12 11 Apr 01 12 Apr 01
10 Apr 01 13 11 Apr 01 13 Apr 01
12 Apr 01 14 13 Apr 01 16 Apr 01
16 Apr 01 15 18 Apr 01 19 Apr 01
20 Apr 01 16 23 Apr 01 25 Apr 01
27 Apr 01 17 28 Apr 01 29 Apr 01
ALERTS:
01 Apr 01: Geomagnetic
01 Apr 01: Flare alert
02 Apr 01: Flare alert
02 Apr 01: Geomagnetic
02 Apr 01: Flare alert
03 Apr 01: Proton
03 Apr 01: Geomagnetic
04 Apr 01: Flare Alert
04 Apr 01: Geomagnetic
05 Apr 01: Flare Alert
06 Apr 01: Flare Alert
08 Apr 01: Geomagnetic
09 Apr 01: Flare Alert
09 Apr 01: Geomagnetic
10 Apr 01: Flare Alert
10 Apr 01: Proton
11 Apr 01: Flare Alert
12 Apr 01: Geomagnetic
12 Apr 01: Flare Alert
12 Apr 01: Geomagnetic
12 Apr 01: Geomagnetic
12 Apr 01: Flare Alert
14 Apr 01: Geomagnetic
14 Apr 01: Proton
15 Apr 01: Flare Alert
15 Apr 01: Proton
17 Apr 01: Proton
18 Apr 01: Geomagnetic
19 Apr 01: Flare Alert
20 Apr 01: Flare Alert
22 Apr 01: Geomagnetic
22 Apr 01: Flare Alert
23 Apr 01: Geomagnetic
23 Apr 01: Flare Alert
24 Apr 01: Flare Alert
24 Apr 01: Geomagnetic
24 Apr 01: Flare Alert
25 Apr 01: Flare Alert
26 Apr 01: Flare Alert
28 Apr 01: Geomagnetic
SWF ALERTS AND DURATION REPORTS
DATE SWF BEGIN-END (UT)
03 Apr 01: SWF Alert (2129-0849 UT)
05 Apr 01: SWF Alert (0204-0354 UT)
10 Apr 01: SWF Alert (0509-0729 UT)
IPS Radio and Space Services | email: asfc at ips.gov.au
PO Box 1386 | WWW: http://www.ips.gov.au/asfc
Haymarket NSW 1240 AUSTRALIA | FTP: ftp://ftp.ips.gov.au/users/asfc/
tel: +61 2 9213 8010 | fax: +61 2 9213 8060
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