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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: Thunderstorms and LF-Propagation Disturbances |
| From: | "Alan Melia" <[email protected]> |
| Date: | Wed, 4 Jul 2012 18:55:37 +0100 |
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Hi Peter that is very interesting, I have not seen anything quite like that before. It is a nice observation. I have heard of the effect, but not seen to convincing a plot. Alan G3NYK----- Original Message ----- From: "pws" <[email protected]> To: <[email protected]> Sent: Wednesday, July 04, 2012 5:50 PM Subject: LF: Thunderstorms and LF-Propagation Disturbances Hi, I'm observing the strength of HGA22 since some years. At late evening of 2012-07-02 strong thunderstorm activity happened over E-Germany/Poland/Czech Republic. That's right below the reflection area, assuming a 1-hop propagation. See: http://www.df3lp.de/misc/hga22/propagation_path.png It's well known that lightnings may heat the ionosphere from below causing disturbances (SIDs). I very often observed those phenomena called "early/fast events". But what happened last Monday evening looks record-breaking. I never saw such chain of ionospheric disturbances. See: http://www.df3lp.de/misc/hga22/2012-07-02_thunderstorm.png Yellow is the raw signal at 10 samples/sec. and blue represents a running median of 100 data points. The comb-like structures are from the modulation bursts - I'm receiving the "space" frequency only. As you can see that's all "signal" and not qrn/qrm or local interference. A control receiver running ~6km apart confirms the observations. Peter, df3lp |
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