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2007 Alpha Aurigids - radio results

During the morning of the 1st September 2007, there is the possibility the normally-minor Alpha Aurigid meteor shower may produce one of its stronger returns. The peak is predicted to fall probably within 20 minutes of 11:36 UT on September 1, but the anticipated activity levels are unknown. See here for additional details

The following radio meteor results were recorded from my home in Goosnargh, north of Preston. I operated three receivers on 55.25 MHz, 105 MHz and 143.05 MHz.

Data 55.25MHz

The following images show a montage of spectrum plots, taken from my usual radio system operating on 55.25 MHz. Each montage covers a one hour period from 2007 September 2007 10:00 UT through to 13:00 UT. These show an increase of longer reflections between 2007 September 01 10:45 UT and 12:15 UT. This corresponds with the time of the predicted Alpha Aurigid peak.

2007 09 01 10:00 - 11:00 UT

2007 09 01 11:00 - 12:00 UT

2007 09 01 12:00 - 13:00 UT

My counts, on 55.25 MHz, don't show anything significant at this time. Possibly understandable given the 4 second hold-off that I use on the Meteor v8 software I use for logging.

... but the length record does show the increasing reflection duration.

105 MHz

I have been running a separate system on 105 MHz. As the 105 MHz transmission is frequency modulated, I'm logging received power (actually the PCR agc value) rather than looking at the demodulated audio. I average this over 60 samples and detect instances when the instantaneous value exceeds twice the average. I intend to run this for five days 00:00 30th August - 00:00 3rd September. At the moment, it looks like this.

I'm assuming that the earlier peak of activity (04:00 - 08:00 UT) is due to a combination of increasing Alpha Aurigid activity and the high radiant altitude.

143.05 Mz

The following images show a montage of spectrum plots, taken from a radio system operating on 143.05 MHz. Each montage covers a one hour period from 2007 September 2007 10:00 UT through to 13:00 UT. These show an increase of longer reflections centred on 2007 September 01 11:30 UT. 

2007 09 01 10:00 - 11:00 UT

2007 09 01 11:00 - 12:00 UT

2007 09 01 12:00 - 13:00 UT