Friday, May 10, 2024

Solar Noise on the 28 MHz band - 10th May 2024

10th May 2024: I had the radio turned on in the background this morning and I noticed a large burst of noise from the sun. I had the SpectrumLab software running since yesterday and I took this screen grab.

Just to explain the image above...

1) I was listening on 28.1246 MHz USB which is the 10m WSPR & QRSS frequency.

2) Around 06:42 UTC, a meteor burnt up about 100kms above the west of England or Wales leaving an ionised trail behind. This lasted long enough that I was able to hear some of the QRSS signals from stations to the east of London, about 600kms to the east of me. The signals lasted for about a minute.

3) At about 06:43:30, the noise from a solar flare erupting on the sun reached the Earth and I heard the burst of solar noise as a loud hissing sound on 28 MHz. You can see this as the brighter colour in the image. It then faded slowly with some minor peaks over the next few minutes.

I later checked the NOAA website in the US and sure enough, there was a peak in the GOES X-Ray flux at about the same time. Link -

It looks as if it was a X3.9 burst from the sunspot group AR 3664.

Maximum 10 May 2024 06:54:00 GMT X3.9 Integrated flux: 4.4e-1 J m-2

I often hear solar noise on the 28 MHz band but this one was a bit stronger than usual.

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