[Ips-msgr] IPS Monthly Report - April 04
rwc
rwc at ips.gov.au
Mon May 3 12:22:13 EST 2004
SUBJ: IPS MONTHLY SUMMARY - APRIL 2004
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 113 3 62
02-Apr 108 2 62
03-Apr 107 25 64
04-Apr 109 11 48
05-Apr 109 13 58
06-Apr 101 17 40
07-Apr 98 7 60
08-Apr 94 14 80
09-Apr 90 11 67
10-Apr 88 8 64
11-Apr 90 6 62
12-Apr 91 9 63
13-Apr 93 5 66
14-Apr 95 3 60
15-Apr 97 6 67
16-Apr 97 10 74
17-Apr 98 8 47
18-Apr 109 9 50
19-Apr 113 5 62
20-Apr 111 2 51
21-Apr 113 6 60
22-Apr 117 4 61
23-Apr 115 13 79
24-Apr 112 9 72
25-Apr 107 10 67
26-Apr 100 4 60
27-Apr 95 4 54
28-Apr 90 5 56
29-Apr 89 3 57
30-Apr 89 7 52
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 03 126.5 60.0 70.4 14.7 88.7 15
May 03 116.7 55.2 67.9 17.5 72.9 12
Jun 03 129.4 77.4 65.3 16.3 75.4 43
Jul 03 127.8 85.0 62.1 13.3 76.7 7
Aug 03 122.1 72.7 60.3 16.2 68.4 4
Sep 03 112.3 48.8 59.8 14.5 67.0 1
Oct 03 153.1 65.6 58.4 23.6 66.6 45
Nov 03 140.8 67.2 57.0p 20.1 70.6 29
Dec 03 115.1 47.0 55.0p 13.0 74.2 6
Jan 04 114.1 37.2 51.5p 17.0 46.5 12
Feb 04 107.8 46.0 48.1p 10.0 54.9 3
Mar 04 112.2 48.9 46.1p 9.8 63.2 4
Apr 04 101.3 39.3 44.3p 8.0 60.8 7
Monthly T indices
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1992 153 172 155 134 95 80 88 66 68 66 84 90
1993 74 77 79 63 63 64 62 50 37 40 34 43
1994 57 41 42 26 15 14 23 18 20 20 20 20
1995 24 33 23 13 3 11 13 10 13 9 13 7
1996 12 7 4 2 5 2 3 4 4 3 11 15
1997 14 11 10 8 11 5 9 17 32 27 28 38
1998 40 41 43 56 46 56 76 75 86 70 74 93
1999 94 81 89 77 98 124 124 105 89 92 123 113
2000 108 120 157 152 129 130 146 138 123 129 136 141
2001 130 131 135 123 112 132 112 113 144 151 156 162
2002 174 174 167 139 130 123 115 126 131 113 110 120*
2003 111* 93* 83* 73* 63* 68* 75* 60* 61 66 63 66
2004 47* 43* 56* 46^ 43^ 40^ 38^ 37^ 35^ 33^ 31^ 30^
2005 28^ 27^ 26^ 24^ 23^ 22^ 20^ 19^ 18^ 17^ 16^ 15^
2006 15^ 14^ 13^ 12^ 12^ 11^ 10^ 9^ 9^ 8^ 8^ 8^
2007 7^ 7^ 7^ 8^ 8^ 9^ 9^ 10^ 10^ 11^ 12^ 12^
2008 13^ 15^ 16^ 17^ 19^ 20^ 23^ 25^ 28^ 31^ 35^ 38^
* = New data. T index may have changed.
^ = IPS predicted T index.
The IPS Monthly T-index is derived from the observed monthly
median values of foF2 for each hour at up to 40 ionospheric
stations worldwide. These records become available from IPS
stations in Australia very soon after each month, but the
majority are received up to one year later. This means that
the exact observed value of the monthly T-index is not
available until some months later.
The predicted smoothed monthly T-indices are computed by
using a statistical analysis of the observed monthly T-indices
for all solar cycles since 1938. The IPS T-indices may not be
updated each month but only when sufficient new
data becomes available.
===============================================================================
2. FLARES AND SHORT-WAVE FADEOUTS
DATE CLASS M CLASS X FLARE FADEOUT POSSIBLE ON
FLARES FLARES MAX DAYLIGHT HF CIRCUIT
05 Apr 04 M1.7/1F 0555UT
06 Apr 04 M2.4/SF 1328UT
15 Apr 04 M1.2/SF 1644UT
22 Apr 04 M1.2/1N 0219UT
23 Apr 04 M1.5 1150UT
23 Apr 04 M1.1/SF 2112UT
25 Apr 04 M2.2/1N 0537UT
10Mev Proton/PCA Event
Began Ended
11 04 2004 1140UT 12 04 2004 0335UT
2.1 Comments on Solar Activity.
Solar activity was at low to moderate levels during the month of
April. A total of 7 M class xray flares were observed. The largest
flare for the month was an M2.4 on Apr 06. A minor proton event
was observed 11-12 April. The proton event is believed associated
with a C9 flare and filament eruption observed early on 11 April.
===============================================================================
3. GEOMAGNETIC DISTURBANCES (for Australian Region)
DATE COMMENTS
03 Apr 04: Minor Storm levels second half of UT day
06 Apr 04: Active periods
08-09 Apr 04: Active periods
23 Apr 04: Active periods
The geomagnetic field was generally at quiet to unsettled
levels during the month of April. The most disturbed day of
the month was 03 Apr with the local A index reaching 25 on
this day. Minor storm conditions followed a weak sudden impulse
of approximately 27nT observed in IPS magnetometer data 1410UT
on 03 Apr. This impulse and subsequent disturbance is possibly
associated with a full-halo coronal mass ejection observed
on 31 Mar.
===============================================================================
4. IONOSPHERIC DISTURBANCES (for Australian Region)
04 Apr 04: Southern region MUFs depressed 20%
06 Apr 04: Southern region MUFs depressed 25%
17 Apr 04: Southern region MUFs depressed 15%
MUFs were generally near or above predicted monthly
values for April. Depressed conditions were observed
in southern Aus/NZ region during local daylight
hours on the above days.
===============================================================================
5. IPS WARNINGS AND ALERTS ISSUED
WARNINGS:
HF RADIO WARNING:
ISSUE DATE NO BEGIN END
03 Apr 04 19 04 Apr 04 04 Apr 04
04 Apr 04 20 05 Apr 04 07 Apr 04
07 Apr 04 21 08 Apr 04 08 Apr 04
21 Apr 04 22 23 Apr 04 24 Apr 04
GEOMAGNETIC WARNING:
ISSUE DATE NO BEGIN END
03 Apr 04 12 04 Apr 04 04 Apr 04
04 Apr 04 13 05 Apr 04 07 Apr 04
07 Apr 04 14 08 Apr 04 08 Apr 04
21 Apr 04 15 23 Apr 04 24 Apr 04
ALERTS:
03 Apr 04: Geomagnetic
04 Apr 04: Geomagnetic
05 Apr 04: Flare Alert
06 Apr 04: Geomagnetic
06 Apr 04: Flare Alert
11 Apr 04: Flare Alert
15 Apr 04: Flare Alert
22 Apr 04: Flare Alert
23 Apr 04: Geomagnetic
25 Apr 04: Flare Alert
SWF ALERTS AND DURATION REPORTS
DATE SWF BEGIN-END (UT)
None Issued.
IPS Radio and Space Services | email: asfc at ips.gov.au
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Haymarket NSW 1240 AUSTRALIA | FTP: ftp://ftp.ips.gov.au
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