<pre><font size="2"><br />SUBJ: IPS MONTHLY SUMMARY - SEPTEMBER 2003<br />ISSUED BY IPS RADIO AND SPACE SERVICES<br />FROM THE AUSTRALIAN SPACE FORECAST CENTRE<br /><br />1. SOLAR-GEOPHYSICAL INDICES<br /><br /> SOLAR AUST AUST<br />Day 10 cm flux A-INDEX T INDEX<br />01-Sep 108 14 70<br />02-Sep 106 12 82<br />03-Sep 111 13 85<br />04-Sep 112 18 83<br />05-Sep 108 15 87<br />06-Sep 105 9 60<br />07-Sep 108 5 66<br />08-Sep 99 6 64<br />09-Sep 96 18 78<br />10-Sep 99 13 76<br />11-Sep 97 11 51<br />12-Sep 94 10 55<br />13-Sep 96 7 57<br />14-Sep 95 5 48<br />15-Sep 97 5 57<br />16-Sep 99 32 66<br />17-Sep 106 37 25<br />18-Sep 109 30 25<br />19-Sep 111 29 35<br />20-Sep 112 26 52<br />21-Sep 120 15 51<br />22-Sep 123 13 64<br />23-Sep 125 15 67<br />24-Sep 134 23 85<br />25-Sep 133 23 74<br />26-Sep 131 15 76<br />27-Sep 130 4 87<br />28-Sep 137 3 94<br />29-Sep 135 3 90<br />30-Sep 133 6 99<br /><br /><br /> 10 CM SUNSPOT SUNSPOT AUST AUST No of<br /> FLUX NUMBER NUMBER A-INDEX T INDEX FLARES<br /> Monthly Monthly Yearly Monthly Monthly >M1.0 <br />Month Average Average Average Average Average <br />Sep 02 175.9 109.3 94.6 9.8 137.7 12<br />Oct 02 167.0 97.5 90.5 15.7 119.7 22<br />Nov 02 168.7 95.0 85.3 14.5 121.1 11<br />Dec 02 157.2 81.6 82.1 13.0 124.5 10<br />Jan 03 144.0 79.5 81.0 12.9 111.6 7<br />Feb 03 125.0 46.2 78.6 15.7 95.5 3<br />Mar 03 132.3 61.5 74.2 15.4 90.9 9<br />Apr 03 126.5 60.0 69.8p 14.7 88.7 15<br />May 03 116.7 55.2 66.0p 17.5 72.9 12<br />Jun 03 129.4 77.4 62.6p 16.3 75.4 43<br />Jul 03 127.8 85.0 59.7p 13.3 76.7 7<br />Aug 03 122.1 72.7 58.1p 16.2 68.4 4<br />Sep 03 112.3 48.8 57.1p 14.5 67.0 1<br /><br /><br /> Monthly T indices<br /> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec<br />1992 153 172 155 134 95 80 88 66 68 66 84 90 <br />1993 74 77 79 63 63 64 62 50 37 40 34 43 <br />1994 57 41 42 26 15 14 23 18 20 20 20 20 <br />1995 24 33 23 13 3 11 13 10 13 9 13 7 <br />1996 12 7 4 2 5 2 3 4 4 3 11 15 <br />1997 14 11 10 8 11 5 9 17 32 27 28 38 <br />1998 40 41 43 56 46 56 76 75 86 70 74 93 <br />1999 94 81 89 77 98 124 124 105 89 92 123 113 <br />2000 108 120 157 152 129 130 146 138 123 129 136 141 <br />2001 130 131 135 123 112 132 112 113 144 151 156 162 <br />2002 174 174 167 137* 128 119 111* 127* 129* 112 109 118 <br />2003 112* 92* 82* 73 62* 73* 77* 60* 58^ 55^ 52^ 49^ <br />2004 46^ 43^ 40^ 38^ 35^ 33^ 31^ 29^ 28^ 26^ 24^ 23^ <br />2005 21^ 20^ 19^ 17^ 16^ 15^ 14^ 13^ 12^ 11^ 10^ 9^ <br />2006 8^ 8^ 7^ 6^ 6^ 5^ 5^ 5^ 4^ 4^ 4^ 4^ <br />2007 4^ 5^ 5^ 6^ 7^ 8^ 9^ 11^ 13^ 16^ 18^ 21^ <br />2008 25^ 28^ 32^ 36^ 41^ 45^ 50^ 54^ 59^ 64^ 68^ 73^ <br />* = New data. T index may have changed.<br />^ = IPS predicted T index.<br /><br />The IPS Monthly T-index is derived from the observed monthly <br />median values of foF2 for each hour at up to 40 ionospheric <br />stations worldwide. These records become available from IPS <br />stations in Australia very soon after each month, but the <br />majority are received up to one year later. This means that <br />the exact observed value of the monthly T-index is not <br />available until some months later.<br /> <br />The predicted smoothed monthly T-indices are computed by <br />using a statistical analysis of the observed monthly T-indices <br />for all solar cycles since 1938. The IPS T-indices may not be <br />updated each month but only when sufficient new <br />data becomes available.<br /><br /><br />===============================================================================<br /><br />2. FLARES AND SHORT-WAVE FADEOUTS <br />DATE CLASS M CLASS X FLARE FADEOUT POSSIBLE ON<br /> FLARES FLARES MAX DAYLIGHT HF CIRCUIT<br />16 Sep 03 M1.3 2224UT<br /><br /><br />2.1 Comments on Solar Activity.<br />Solar activity was at low to very low levels this month, with<br />only one low level M class flare observed. Solar coronal holes<br />continued to feature on the solar disk.<br /><br /><br />===============================================================================<br /><br />3. GEOMAGNETIC DISTURBANCES (for Australian Region)<br /><br />DATE COMMENTS<br />04-05 Sep 03: Unsettled to Active<br />09-10 Sep 03: Quiet to Active<br /><br />16-19 Sep 03: Active to minor storm conditions. Isolated severe<br /> storm intervals on 17 Sep.<br /><br />20-23 Sep 03: Unsettled to active. Isolated minor storm periods observed<br /> on 20 Sep.<br /><br />24-25 Sep 03: Unsettled to Minor Storm<br /><br />Coronal hole high speed wind streams were the predominate cause of <br />activity during the month. Several minor filament eruptions may <br />also have contributed to activity, but mass ejection signatures<br />from these events were mostly indistinct. The most disturbed day <br />of the was observed on 17 Sep when the local A index reached 37.<br /><br />===============================================================================<br /><br />4. IONOSPHERIC DISTURBANCES (for Australian Region)<br />17 03: Southern region MUFs depressed 20%<br />18 03: Northern region MUFs depressed 12%<br /> Southern region MUFs depressed 26%<br />19 03: Southern region MUFs depressed 18%<br /><br />Depressed MUFs, mostly confined to the southern<br />Aus/NZ region, were observed during the interval<br />17-19 Sep, following coronal hole high speed<br />wind stream induced geomagnetic activity.<br /><br />===============================================================================<br /><br />5. IPS WARNINGS AND ALERTS ISSUED<br /><br />WARNINGS:<br />HF RADIO WARNING:<br />ISSUE DATE NO BEGIN END<br />07 Sep 03 62 09 Sep 03 10 Sep 03<br />16 Sep 03 63 18 Sep 03 19 Sep 03<br />16 Sep 03 64 17 Sep 03 18 Sep 03<br />21 Sep 03 65 21 Sep 03 21 Sep 03<br />25 Sep 03 66 25 Sep 03 25 Sep 03<br /><br /><br />GEOMAGNETIC WARNING:<br />ISSUE DATE NO BEGIN END<br />05 Sep 03 41 08 Sep 03 10 Sep 03<br />12 Sep 03 42 14 Sep 03 15 Sep 03<br />16 Sep 03 43 17 Sep 03 19 Sep 03<br />21 Sep 03 44 21 Sep 03 21 Sep 03<br />24 Sep 03 45 24 Sep 03 24 Sep 03<br /><br /><br />ALERTS: <br />16 Sep 03: Geomagnetic<br />16 Sep 03: Flare Alert<br />17 Sep 03: Geomagnetic<br />18 Sep 03: Geomagnetic<br />19 Sep 03: Geomagnetic<br />20 Sep 03: Geomagnetic<br />24 Sep 03: Geomagnetic<br />25 Sep 03: Geomagnetic<br /><br /><br />SWF ALERTS AND DURATION REPORTS<br />DATE SWF BEGIN-END (UT)<br />None Issued.<br /><br /><br />IPS Radio and Space Services | email: asfc@ips.gov.au<br />PO Box 1386 | WWW: http://www.ips.gov.au <br />Haymarket NSW 1240 AUSTRALIA | FTP: ftp://ftp.ips.gov.au <br />tel: +61 2 9213 8010 | fax: +61 2 9213 8060 <br /><br />IMPORTANT: This e-mail, including any attachments, may contain,confidential<br />or copyright information. The views expressed in this message are those of<br />the individual sender, unless specifically stated to be the views of IPS.<br />If you are not the intended recipient, please contact the sender immediately<br />and delete all copies of this e-mail and attachments.<br /><br />_______________________________________________<br />ips-msgr mailing list<br />ips-msgr@ips.gov.au<br /> http://www.ips.gov.au/mailman/listinfo/ips-msgr <br /></font></pre><br /> <br /> <small>[ 13. October 2003, 08:39 AM: Message edited by: David Bate ]</small>