Long-Delay Radio Echos heard on 7 MHz

Radio Amateur Peter Brogl, DK6NP, reports hearing Long-Delay Radio Echos on 7 MHz during a geomagnetic storm on November 27.

The SpaceWeather.com website reports:

During the geomagnetic storm of November 27th, a brief but intense G2-class event, amateur radio operator Peter Brogl of Fürth, Germany experienced a strange phenomenon. Forty-six seconds after he transmitted his call sign at 7 MHz, he received an echo of his own transmission.

"At first, I thought someone was playing tricks on me," says Brogl, "but I changed frequency, re-keyed my call sign (DK6NP), and got another echo." This went on for more than an hour, enough time for Brogl to make several recordings.

First reported in 1927 by Norwegian civil engineer Jørgen Hals, long-delay radio echoes are rare and poorly understood.

Unusual propagation conditions linked to solar storms is one of many possible explanations. Other explanations can be seen on Shlionskiy's Long Delayed Echo page at
http://heim.ifi.uio.no/~sverre/LDE/Shlionskiy15.htm

Audio recordings made by DJ6NP of the 7MHz Long Delayed Echos can be heard at
http://brogl.net/Audio/

Space Weather
http://www.spaceweather.com/

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