Re: LF: dx forecast and EUV radiation

["Hugh_m0wye" <m0wye@radiouk.com>]

Thank you Piotr,

That is the best collection of propagation data I have seen so far, and I have bookmarked it.

It translates quite well with Google.

But i still can't see a number there which represents the level of EUV reaching the Earth.

I suppose the "sunspot number" comes close, because the EUV seems mostly to come from sunspots.

Thanks and 73

Hugh

----- Original Message -----

From: Piotr Mlynarski

To: rsgb_lf_group@blacksheep.org

Sent: Thursday, November 10, 2011 10:14 AM

Subject: Re: LF: dx forecast and EUV radiation

W dniu 2011-11-10 10:54, Hugh_m0wye pisze:

Hello group,

I was re-reading the chapter on propagation in an RSGB book on Operating Practice, and it said that the ionisation of our precious F layers (and also the D absorbtion layer) was caused by Extreme UV radiation. This is wavelengths 120nm up to 10nm.

 

We monitor the solar wind and solar flares to try and predict what changes in propagation will occur, but these things seem mainly to be negative influences on propagation - things which disrupt the propagation.

 

It would be nice to monitor the EUV levels from the Sun as well...

 so my question is really "does anyone know of a source of Internet data for this radiation?"

Hello Hugh,

perhaps, the link below   could  be of some interest to you

http://cfivarese.altervista.org/SI_Macchie_solari_real_time.html

                                               73, Piotr, sq7mpj