Last updated 29 Jul 2010 02:03 UT SUBJ: IPS WEEKLY GEOPHYSICAL REPORT ISSUED ON 29 JULY 2010, BY IPS RADIO AND SPACE SERVICES, FROM THE AUSTRALIAN SPACE FORECAST CENTRE 1. SUMMARY (20 JULY - 28 JULY) K indices are in UT (0-24). For conversion to local time: AEST = UT + 10 hours; ACST = UT + 9.5 hours; AWST = UT + 8 hours Australian Region* Date K-INDICES A 20 Jul 2121 1111 4 21 Jul 2211 1111 4 22 Jul 1112 1111 3 23 Jul 1232 1222 7 24 Jul 2110 1221 4 25 Jul 2221 2221 6 26 Jul 2221 0112 4 27 Jul 2333 3332 13 28 Jul 3233 3222 11 *estimated from real time data NOTE: Indices may have been generated from data obtained in cooperation with the following organisations: Geoscience Australia, University of Newcastle Space Physics Group, Australian Government Antarctic Division and Space Environment Research Center, Japan. Quiet to Unsettled conditions over the last 7 days with occasional Active periods for high latitudes due to coronal hole effects. Mostly Quiet conditions expected for the next week with minimal coronal hole influenced geomagnetic activity. 2. FORECAST (29 JULY - 28 AUGUST) Disturbed Periods: Active on 23 Aug. Best Quiet Periods: 30 Jul to 9 Aug, 12 Aug to 18 Aug, 20 Aug to 22 Aug. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 29 Jul to 23 Aug. Central Australian Regions: Disturbed Periods: None. Best Quiet Periods: 29 Jul to 24 Aug. Southern Australian Regions: Disturbed Periods: 23 Aug to 24 Aug. Best Quiet Periods: 29 Jul to 21 Aug. Pc3 pulsations are high frequency (10-45 second period) variations of the Earths magnetic field. Daily pc3-indices are the daily sum of 20 minute pc3-indices for that station and have been shown to be well correlated with rejection of high resolution aeromagnetic survey flight-line data. PLEASE NOTE: Geomagnetic activity can frequently be determined by short timescale solar events that cannot be forecast a week in advance, particularly at solar maximum.