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21/01/2005 19:05-19:15 UTC 48.250 MHz
This aurora was sparked by a CME ejected from Sunspot #720, in the form of an X7 flare the previous day.
The event was short and strong.
21/01/2005 22:35 UTC 48.250 MHz
Second hit, even shorter in duration!
27/07/2004 14:00-16:00 UTC 48.250 and 59.280 MHz
This daytime aurora lasted for a few hours, and showed quite high Doppler spreads on the signals.
22/12/2003 05:05-07:30 UTC 48.250 MHz
A brief aurora during the early hours. The solid, slowly drifting line is interference from nearby equipment.
Some pings from the Ursids meteors are also visible.
20/11/2003 1905-1927 UTC 48.250 MHz.
Captured during a very strong aurora – reflections coming from several different transmitters. Along the bottom of the plot is an extended time-base view showing that this was an odd deviation for 10 minutes from what had been ongoing for a long period of time that evening. The green border marks the area of the main plot window.
Oct 31 2003 00:30 UTC 48.250 MHz
The image below is a very good example of an auroral signal. It was recorded on 31st Oct 2003 between 0010 and 0110 GMT, during the second night of big auroras over the UK. Visible in the sky over Plymouth were various red glows and an arc of white stretching overhead. The signal is spread out due to the rapid Doppler shift caused by the charged particles in the auroral curtain rapidly moving. Several TV carriers, which are a few hundred Hertz apart, are being reflected simultaneously, making the Doppler effect appear bigger than it really is.
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