GM4ULS ham radio station

a QRM-free zone!

Stop, hey what’s that sound?

Posted by gm4uls on December 2, 2011

If you’re a Buffalo Springfield fan don’t get excited. Also, if you don’t like loud noises don’t click on the link at the end of this post.

GB2RS News blithely announced on Sunday that there were no untoward solar events expected this week. The old treacle bun was going to be co-operative – plenty of sunspots giving us MUFs way above 30MHz and nothing to disturb it, especially no coronal mass ejections. Imagine the embarrassment of the newsreaders UK-wide when a massive CME occurred on Sunday.

A day or so later M1OOO, PD0AC, and myself were having a three-way QSO on 40m. Ian M1OOO who is an astronomer and very active at the Norman Lockyer Observatory in Sidmouth, drew our attention to a loud noise a little way up the band, wanting to know if Hans and I could hear it. We could. Ian then explained to us that it was the sound (as interpreted by our receivers) of plasma from the CME hitting the earth’s magnetic field.

Later on I found it again on 7.180MHz and made this recording of it: plasma

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4 Responses to “Stop, hey what’s that sound?”

  1. Hans said

    It’s an alien invasion, I tell you. Prepare the tin foil hats!

  2. Dave G7SKR said

    Shame it’s not April 1st. It sounds more like STANAG 4285 to me.

    • gm4uls said

      Well I guess that would depend on the characteristics of Stanag 4285. We’ve heard the noise in question specifically after CMEs and not at other times; also it’s not static – gradually moves up the band. I wonder if Stanag does that?

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