Re: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software
On 25/09/11 08:29 AM, Patrik Tast wrote: > Most interesting, > > Tell us more how you did it. > - antenna used? > - daugherboard? > - etc > > Many SDR users in Northern Scandinavia are up day and night > listening on submarine traffic on VLF. > > I use a square-loop antenna, roughly 1.5M in diameter. I have roughly 80M of 22ga wire wound onto it. This feeds a Behringer Mini-Mic 800 microphone preamplifier, which is then fed into a 96KHz sound card--no USRP required. The software I wrote for this I call SIDsuite. It's available via GitHub: https://github.com/patchvonbraun/SIDSuite It works by measuring the received signal stength for various VLF transmitters--most of them are indeed submarine communications systems. The signal strength follows a diurnal pattern involving solar radiation and the D and E layers of the ionosphere. When there are strong solar X-ray events, that pattern is disturbed--sometimes spectacularly. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software
Most interesting, Tell us more how you did it. - antenna used? - daugherboard? - etc Many SDR users in Northern Scandinavia are up day and night listening on submarine traffic on VLF. Patrik - Original Message - From: Marcus D. Leech To: Discuss-gnuradio@gnu.org Sent: Sunday, September 25, 2011 0:06 Subject: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software Some of you know that among my various activities involving the application of radio to space science, I operate a VLF receiver, called SIDsuite, that is a Gnu Radio based application. Today, sunspot group 1302 has been putting on a great show, and I wanted to share the plot of one of the VLF paths I monitor, which is strongly affected by solar X-Ray flare activity, due to X-Ray flux changing the refractive index of the ionosphere. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio <>___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software
On 09/24/2011 08:14 PM, Pace VanDevender wrote: Marcus, this is amazing data. What frequencies are in your VLF band? Pace That particular trace was at 24KHz--looking at the NAA station in Cutler, Maine. Here is the data for NML, at 25.2Khz, located in LaMour, North Dakota: You can see that the response is absorptive, rather than reflective, and less intense, along this very-much-longer path between my receiver and the transmitter in North Dakota. In particular, the M7 at 15:20 UTC isn't even visible in this data, because the Sun angle at the transmitter site was probably "all wrong" to get a strong response at that time of day. I monitor several different frequencies, and submit data to the Stanford SID data center every day. With my 96KHz sound card, and loop antenna, I can "see" from a few hundred Hz to around 45KHz or so. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software
On 24/09/11 05:33 PM, Nick Foster wrote: > Marcus, > > Very cool stuff! Can I ask about the hardware you're using with SIDsuite? > > --n > Highly sophisticated, top-secret alien-inspired technology :-) Actually, a 1.5M wide square-loop antenna, with about 80M of 22ga wire on it. Feeding a Behringer Mini-MIC microphone preamplifier, then into my 96KHz sound card. http://www.behringer.com/EN/Products/MIC800.aspx -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software
Marcus, Very cool stuff! Can I ask about the hardware you're using with SIDsuite? --n On Sat, Sep 24, 2011 at 2:06 PM, Marcus D. Leech wrote: > ** > Some of you know that among my various activities involving the application > of radio to space science, I operate a VLF receiver, called > SIDsuite, that is a Gnu Radio based application. > > Today, sunspot group 1302 has been putting on a great show, and I wanted to > share the plot of one of the VLF paths I monitor, which is > strongly affected by solar X-Ray flare activity, due to X-Ray flux > changing the refractive index of the ionosphere. > > [image: Sunspot group 1302: a party animal] > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > <>___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] X-Ray flare observations with Gnu Radio software
Some of you know that among my various activities involving the application of radio to space science, I operate a VLF receiver, called SIDsuite, that is a Gnu Radio based application. Today, sunspot group 1302 has been putting on a great show, and I wanted to share the plot of one of the VLF paths I monitor, which is strongly affected by solar X-Ray flare activity, due to X-Ray flux changing the refractive index of the ionosphere. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
