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Re: LF: HF Radio black out / also on VLF!

To: <[email protected]>
Subject: Re: LF: HF Radio black out / also on VLF!
From: "Alan Melia" <[email protected]>
Date: Wed, 6 Sep 2017 15:08:04 +0100
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Hi Rik without checking I think you are right the downward slope of the last cycle seems to come to mind. It doesnt look as though the GEOS sensors saturated so the flux value should be about right.
The two CMEs in quick succession should be interesting to watch around Friday.
The animation on
is quite interesting. It shows how the CME snowploughs into the coronal hole
stream scooping up the plasma and creating the Proton big event. This has
left the field fairly clear for the CME associated with today's X2 event.

----- Original Message -----
Sent: Wednesday, September 06, 2017 2:37 PM
Subject: Re: LF: HF Radio black out / also on VLF!

seems to be a X10 flare, it has been a while that we had such a strong flare

73, Rik  ON7YD

Van: [email protected] <[email protected]> namens Markus Vester <[email protected]>
Verzonden: woensdag 6 september 2017 14:59
Aan: [email protected]
Onderwerp: Re: LF: HF Radio black out / also on VLF!
Another even stronger one at 12 UT:

73, Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Mi, 6. Sept 2017 11:56
Betreff: Re: LF: HF Radio black out / also on VLF!

Hi Roelof,

Very interesting. It also affects VLF! Clearly visible e.g. at
It happens since about 9 UTC.
Would have been interesting to observe the propagation on 8.27 kHz during that time...

73, Stefan

Am 06.09.2017 11:15, schrieb Roelof Bakker:
Hello all,

Now something different:

It looks like a severe radio black out of HF is ongoing.
I have never seen this before. See attachment.

This is also an opportunity to look at PLC interference at the lower 
bands, which is normally covered by signals.

I checked it on 3 different antennas: mini-whip, loop and 

Roelof, pa0rdt
Middelburg, JO11tm

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