Daily Report

(last updated 12 Aug 2026 23:30 UT)

SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT ISSUED AT 2330UT/12 AUGUST 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE SUMMARY FOR 12 AUGUST AND FORECAST FOR 13 AUGUST - 15 AUGUST STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx ----------------------------------------------------------- 1A. SOLAR SUMMARY Activity 12 Aug: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 12 Aug: 99/46 1B. SOLAR FORECAST 13 Aug 14 Aug 15 Aug Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 100/48 102/50 98/45 COMMENT: Solar activity on UT day 12-Aug was R0, with no solar flares. There are currently four numbered sunspot regions on the solar disk. Active region (AR) 4503 (S17W38, beta) has grown rapidly in the past day, but remains a small uncomplicated region. ARs 4506 (N12E15, beta) and 4507 (N04E33, beta) have matured and stabilised. Other sunspot regions are stable. Solar activity over 13-15 Aug is expected to be R0. No Earth directed CMEs were observed on UT day 12-Aug. S0 solar radiation storm conditions were observed on UT day 12-Aug. S0 solar radiation storm conditions are expected over 13-15 Aug. The solar wind environment on UT day 12-Aug was mostly near background levels, continuing to settle after the CME impact on 11-Aug. The solar wind speed ranged between 430 and 460 km/s. The peak total interplanetary field strength (IMF, Bt) was 6 nT and the north-south IMF component range was +4 to -5 nT. The solar wind is expected to be mostly near background levels on 13-Aug, and by the end of 14-Aug going into 15-Aug a small coronal hole may connect with Earth to mildly enhance the solar wind speed. ----------------------------------------------------------- 2A. MAGNETIC SUMMARY Geomagnetic field for Australian Region 12 Aug: G0 Estimated Indices 12 Aug : A K Australian Region 4 12122120 Cocos Island 4 12122120 Darwin 4 12122111 Townsville 5 13122111 Learmonth 7 12223130 Alice Springs 4 02122120 Gingin 7 12223230 Canberra 3 02122110 Kennaook Cape Grim 5 12123111 Hobart 4 12122111 Estimated Antarctic Regional K Indices 12 Aug : Macquarie Island 7 02143111 Casey 8 33322120 Mawson 33 16434264 Observed Regional daily pc3 Indices 12 Aug : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 5 (Quiet) Alice Springs 0 (Quiet) Gingin 0 (Quiet) Canberra 2 (Quiet) Hobart 0 (Quiet) 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. 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 International Center for Space Weather Science and Education, Japan. Estimated AFr/Ap Indices 12 Aug : A Fredericksburg 8 Planetary 8 Observed AFr/Ap Indices 11 Aug : A K Fredericksburg 6 Planetary 7 1112 3321 2B. MAGNETIC FORECAST Date Ap Conditions 13 Aug 6 G0 14 Aug 12 G0 15 Aug 14 G0 COMMENT: G0 geomagnetic conditions were observed on UT day 12-Aug. G0 geomagnetic conditions are expected over 13-15 Aug. A small coronal hole may connect with the Earth by late 14-Aug or else on 15-Aug to enhance the solar wind speed, but not expected to induce any significant activity. ----------------------------------------------------------- 3A. GLOBAL HF PROPAGATION SUMMARY Latitude Band Date Low Middle High 12 Aug Normal Normal Normal PCA Event : No event. 3B. GLOBAL HF PROPAGATION FORECAST Latitude Band Date Low Middle High 13 Aug Normal Normal Normal 14 Aug Normal Normal Normal 15 Aug Normal Normal Normal-fair COMMENT: HF radio propagation conditions on UT day 12-Aug were mostly normal. HF radio propagation conditions are expected to be mostly normal over 13-15 Aug, with some mild degradations possible at high latitudes on 15-Aug due to enhanced solar wind speeds. ----------------------------------------------------------- 4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY Date T index 12 Aug 53 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: Near predicted monthly values during local day. Depressed by 20% during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 20% during local night. Southern Australian Region: Mostly near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Jul 75 Aug 64 Sep 61 4B. AUSTRALIAN REGION IONOSPHERIC FORECAST Date T index MUFs 13 Aug 60 Near predicted monthly values 14 Aug 55 Near predicted monthly values 15 Aug 45 Near predicted monthly values COMMENT: Maximum usable frequencies (MUFs) in the Australian region on UT day 12-Aug were mostly near predicted values to 20% depressed. Degraded conditions were observed in Darwin during local night and dawn hours. MUFs are expected to be mostly near predicted values. Mild depressions are possible during local night hours on 15-Aug. ----------------------------------------------------------- 5. SPACE ENVIRONMENT SUMMARY GOES satellite data for 11 Aug Daily Proton Fluence >1 MeV: 3.9E+05 Daily Proton Fluence >10 MeV: 2.0E+04 Daily Electron Fluence >2 MeV: 2.90E+07 (normal fluence) Electron Fluence Daily Deep Dielectric Discharge Probability: 5% Fluence (flux accumulation over 24hrs)/ cm2-ster-day. X-ray background: B2.5 DSCOVR Satellite Solar Wind Day Averaged Data for 11 Aug Speed: 437 km/sec Density: 5.8 p/cc Temp: 184000 K Bz: 2 nT (Courtesy Space Weather Prediction Center, Boulder USA) -----------------------------------------------------------