Daily Report

(last updated 02 Jun 2026 23:30 UT)

SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT ISSUED AT 2330UT/02 JUNE 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE SUMMARY FOR 02 JUNE AND FORECAST FOR 03 JUNE - 05 JUNE STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx ----------------------------------------------------------- 1A. SOLAR SUMMARY Activity 02 Jun: R1 Flares Max Fadeout Freq. Sectors M1.2 0445UT possible lower E. Asia/Aust. M1.2 1005UT possible lower European M3.3 1650UT possible lower South American/ Atlantic Observed 10.7 cm flux/Equivalent Sunspot Number for 02 Jun: 146/100 1B. SOLAR FORECAST 03 Jun 04 Jun 05 Jun Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 150/105 152/107 145/99 COMMENT: Solar flare activity on UT day 02-Jun was at the R1 level due to three M-class flares, the largest of which was an M3.3 flare at 02/1650UT produced by Active Region (AR) 4455 (N09W05, beta-gamma). This region also produced an M1.2 flare at 02/1005UT. There are currently eight numbered active regions visible on the solar disk. AR 4455 is the largest and most magnetically complex region on the disk and has exhibited spot development in its leader spots over the UT day. Regions 4457 (S10W40, beta) and 4460 (S25W60, beta) have shown spot growth. AR 4459 (N10E47, beta) has shown growth in its trailing spot. Newly numbered regions 4461 (S22E72, beta) and 4462 (N15E73, beta) recently rotated over the eastern limb and appear stable. All other regions are either stable or in decay. Solar flare activity is expected to be at R0-R1 levels over 03-05 Jun, primarily due to the observed flare activity of regions 4455 and 4461. S0 solar radiation storm conditions were observed on UT day 02-Jun. S0 solar radiation storm conditions are expected over 03-05 Jun. No Earth-directed coronal mass ejections (CMEs) have been observed. A filament eruption was observed, visible in H-alpha imagery from 02/0938UT centred near S10E70. A subsequent associated CME was observed in coronagraph imagery at 02/1224UT. Modelling indicates this CME is not geoeffective. An east-directed CME was observed, visible in LASCO C2 coronagraph imagery from 02/1700UT. This CME is considered a farside event and not geoeffective. The solar wind speed on UT day 02-Jun mildly declined, ranging from 405 to 365 km/s and is currently near 375 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 7 nT and the north-south IMF component (Bz) range was -6 to +6 nT. The solar wind speed is expected to increase on 03-Jun due to coronal hole high speed wind stream effects from a small equatorial coronal hole, then remain elevated over 04-05 Jun. ----------------------------------------------------------- 2A. MAGNETIC SUMMARY Geomagnetic field for Australian Region 02 Jun: G0 Estimated Indices 02 Jun : A K Australian Region 3 11111021 Cocos Island 3 11101121 Darwin 4 21111022 Townsville 4 12211021 Learmonth 5 21211031 Alice Springs 2 12100021 Gingin 5 22201031 Canberra 2 11111020 Kennaook Cape Grim 3 11111121 Hobart 3 11111120 Estimated Antarctic Regional K Indices 02 Jun : Macquarie Island 3 11122010 Casey 7 23321121 Mawson 25 54322255 Observed Regional daily pc3 Indices 02 Jun : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 0 (Quiet) Canberra 0 (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 02 Jun : A Fredericksburg 6 Planetary 7 Observed AFr/Ap Indices 01 Jun : A K Fredericksburg 9 Planetary 9 2122 3331 2B. MAGNETIC FORECAST Date Ap Conditions 03 Jun 12 G0, chance of G1 04 Jun 10 G0 05 Jun 8 G0 COMMENT: G0 geomagnetic conditions were observed in the Australian and planetary regions on UT day 02-Jun. G1 geomagnetic conditions were observed in the Antarctic region. G0 planetary geomagnetic conditions are expected over 03-05 Jun, with a chance of G1 on 03-Jun due to coronal hole high speed wind stream effects from an equatorial coronal hole. ----------------------------------------------------------- 3A. GLOBAL HF PROPAGATION SUMMARY Latitude Band Date Low Middle High 02 Jun Normal Normal-fair Normal PCA Event : No event. 3B. GLOBAL HF PROPAGATION FORECAST Latitude Band Date Low Middle High 03 Jun Normal Normal Normal-fair 04 Jun Normal Normal Normal-fair 05 Jun Normal Normal Normal-fair COMMENT: Global ionospheric conditions were normal to fair on UT day 02-Jun, with some degradations observed in the southern hemisphere. Global ionospheric conditions are expected to be mostly normal over 03-05 Jun, with some mild degradations possible at high latitudes. Shortwave fadeouts are possible. ----------------------------------------------------------- 4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY Date T index 02 Jun 82 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 15% during local night. Northern Australian Region: Mostly near predicted monthly values. Southern Australian Region: Mostly near predicted monthly values. Enhanced by 20% after local dawn. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index May 67 Jun 68 Jul 65 4B. AUSTRALIAN REGION IONOSPHERIC FORECAST Date T index MUFs 03 Jun 80 Near predicted monthly values 04 Jun 85 Near to 15% above predicted monthly values 05 Jun 85 Near to 15% above predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 51 was issued on 2 June and is current for 2-4 Jun. Maximum Usable Frequencies (MUFs) in the Australian region were mostly near predicted monthly values to 20% enhanced on UT day 02-Jun. Significant spread-F was observed across the Australian region during local night hours, with the most significant spread-F observed in the southern Australian region. MUFs are expected to be near predicted monthly values on 03-Jun, then near predicted monthly values to 15% enhanced over 04-05 Jun. Shortwave fadeouts are possible. ----------------------------------------------------------- 5. SPACE ENVIRONMENT SUMMARY GOES satellite data for 01 Jun Daily Proton Fluence >1 MeV: 1.2E+05 Daily Proton Fluence >10 MeV: 1.9E+04 Daily Electron Fluence >2 MeV: 1.80E+07 (normal fluence) Electron Fluence Daily Deep Dielectric Discharge Probability: 3% Fluence (flux accumulation over 24hrs)/ cm2-ster-day. X-ray background: B5.9 DSCOVR Satellite Solar Wind Day Averaged Data for 01 Jun Speed: 410 km/sec Density: 3.1 p/cc Temp: 20500 K Bz: -2 nT (Courtesy Space Weather Prediction Center, Boulder USA) -----------------------------------------------------------