[IRCA] Fwd: [sdr-radio-com] Published: CODAR image - by President RFSpace N4IP

[Nick Hall-Patch <nhp@xxxxxxxx>]

Those who DX shortwave know about, and are probably not very happy 
about, CODAR.   However, it can be used to study activity of the 
ionosphere as well, which may be of interest to MW DXers who are 
interested in propagation.

best wishes,

Nick

***************
From the sdr-radio group:




> From: <http://www.spaceweather.com/>http://www.spaceweather.com/
> Pieter Ibelings, President RFSpace Corp, has published
> ionospheric analysis of recent CME event reflected by
> CODAR imagery.
>
> ---------------------------
> The Jan. 22nd CME also disturbed Earth's ionosphere. In Atlanta,
> Georgia, radio engineer Pieter Ibelings monitored a 4.5 MHz CODAR
> (coastal radar) signal as it bounced off layers of ionization along the
> US east coast. "The moment of impact can be clearly seen on the CODAR
> radar plot," he points out:
>
> "The CODAR transmitters are located all around the coast and are used
> for mapping the ocean currents to a distance of about 200 miles,"
> Ibelings explains. "These signals also propagate through the ionosphere
> so they can be picked up all around the world. The signals are almost
> perfect for ionospheric sounding since they are linear chirps. I capture
> the chirp with a receiver locked to GPS both in frequency and time. I
> then de-chirp the waveform so I can extract the time of arrival
> information at my location."
>
> The CODAR echoes show ionization layers shifting vertical position by
> some hundreds of kilometers, changes that surely affected the
> propagation of HF radio signals in the aftermath of the impact. More
> information about Ibelings' observations may be found here:
>
> <URL:
> <http://www.rfspace.com/RFSPACE/BLOG/Entries/2012/1/22_CODAR_Ionospheric_Observations_during_the_CME_Impact_of_JAN_22,_2012.html>http://www.rfspace.com/RFSPACE/BLOG/Entries/2012/1/22_CODAR_Ionospheric_Observations_during_the_CME_Impact_of_JAN_22,_2012.html
> >
> -------------------------
> 73 Ken
>
> ------------------------------------

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