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home | newest check | boards | help index | log | ps | userlogin | send sysop | slog | status forward | bcm news | users | version | remove cookieVA2OM > SOLAR 03.08.26 18:12l 77 Lines 3539 Bytes #1 (0) @ WW BID : 14490_VE2PKT Read: GUEST Subj: Solar and Geomagnetic Activity Path: JH4XSY<N3HYM<K5DAT<VK3AT<VE2PKT Sent: 260803/0911Z 14490@VE2PKT.#TRV.QC.CAN.NOAM LinBPQ6.0.25 :Product: Weekly Highlights and Forecasts :Issued: 2026 Aug 03 0413 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # https://www.swpc.noaa.gov/content/subscription-services # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 27 July - 02 August 2026 Solar activity reached Moderate levels during the period, with a total of 35 C-class flares and 2 R1 (Minor) radio blackouts events. Region 4494 (S05, L=88) produced an M1.0/Sf peaking at 27/0243 UTC and Region 4492 (N=15, L=107, class/area Cko/310 on 26 July) produced the largest flare of the week, a long-duration M1.9/Sf that peaked at 30/1700 UTC. This event was accompanied by a partial-halo CME and a simultaneous eight-degree-long filament eruption, centered near N20W67. Associated with these 30 Jul events, two Type II radio sweeps were observed at 30/1627 UTC and 30/1645 UTC, with estimated shock speeds of 843 km/s and 1,681 km/s, respectively. Other radio events included a Type IV sweep at 30/1631 UTC and a 17-minute-long Tenflare (190 sfu) that peaked at 30/1643 UTC. Analysis of the CME propagation indicated an Earth-directed component with estimated velocity of 878 km/s that was anticipated to disturb the Geospace on Aug 02, which was later confirmed by a Sudden Impulse observed on 02/1229 UTC (with deviation of 27 nT) and further geomagnetic activity enhancement. The greater than 10 MeV proton flux crossed the S1 (Minor) solar radiation event threshold twice during the period: first at 30/1845 UTC (reaching a peak of 18 pfu at 30/2055 UTC); and, after returning to levels below S1 around 30/0715 UTC, the flux got elevated again and crossed the threshold of 10pfu at 31/1335 UTC. Additionally, the greater than 100 MeV proton flux briefly exceeded 1pfu at 30/1835. All proton flux enhancements were likely associated with the M1.9/Sf flare mentioned above. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 27 Jul and 01 Aug, with the maximum value of the period (1,379 pfu) observed at 27/1630 UTC. Geomagnetic activity was at Quiet to G2 (Moderate) levels during the week. Unsettled levels were observed on 27-28 Jul, followed by quiet levels on 29 Jul to 01 Aug. On 02 Aug, active levels were observed, with an isolated synoptic period of G2 (Moderate) storming level due to the impact of the abovementioned CME that left the Sun on 30 Jul. Forecast of Solar and Geomagnetic Activity 03 August - 29 August 2026 Solar activity is expected to be predominantly at low levels, with a chance for R1-R2 (Minor-Moderate) levels throughout the outlook period. No proton events (greater than 10 MeV) are expected at geosynchronous orbit. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 12-16 Aug and 22-23 Aug due to recurrent high speed streams. Normal to moderate electron flux levels are expected for the remaining days of the outlook period. Geomagnetic activity is expected to reach G1 (Minor) storming levels on 03 Aug (as the ongoing CME disturbances persist and wane) and on 19 Aug (due to the anticipated effects of a High Speed Stream originated in a negative polarity Coronal Hole). Active levels are expected on 17-18 Aug, due to the -CH HSS previously mentioned. Unsettled levels are expected on 04, 11-12 and 20 Aug, and Quiet levels on the remaining days of the outlook period. 73 de VA2OM, SYSOP of VE2PKT
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