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47347
From: Eve, [DNS_Address]
Subject: X 1.2 Class Solar Flare
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R3 (Strong) HF Radio Blackout Event 29 March, 2023 UTC-Day published: Wednesday, March 29, 2023 03:14 UTC A R3 (Strong) HF radio blackout event occurred due to a X1.2 flare from Region 3256 on 28 March, 2023, at 10:33 pm EDT (29/0233 UTC). |
47348
From: Eve, [DNS_Address]
Subject: Re: X 1.2 Class Solar Flare
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47349
From: Eve, [DNS_Address]
Subject: Re: X 1.2 Class Solar Flare
URL: https://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap
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(D-Region animation at link) The D-Region Absorption Product addresses the operational impact of the solar X-ray flux and SEP events on HF radio communication. Long-range communications using high frequency (HF) radio waves (3 - 30 MHz) depend on reflection of the signals in the ionosphere. Radio waves are typically reflected near the peak of the F2 layer (~300 km altitude), but along the path to the F2 peak and back the radio wave signal suffers attenuation due to absorption by the intervening ionosphere. The D-Region Absorption Prediction model is used as guidance to understand the HF radio degradation and blackouts this can cause. |
Responses:
[47350]
47350
From: Eve, [DNS_Address]
Subject: Re: X 1.2 Class Solar Flare
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X-CLASS SOLAR FLARE: This is becoming routine. The sun just produced another X-class solar flare, the 7th of 2023. The X1.2-category explosion came from sunspot AR3256 near the sun's southwestern limb:  Radiation from the flare ionized the top of Earth's atmosphere, causing a strong shortwave radio blackout over southeast Asia, Australia and New Zealand. Ham radio operators may have noticed loss of signal below 30 MHz for as much as an hour after the peak of the flare (March 29th @ 0233 UT). The flare was impulsive, and was probably too brief to lift a CME out of the sun's atmosphere. We will monitor SOHO coronagraph images in the hours ahead for confirmation |
Responses:
None
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