December

Home Up Geminids 2005 2005 Dec 21

 

2006

The following colorgramme shows the radio meteor counts for the month of December 2006. The horizontal axis shows the day of the month and the vertical axis the local time (UT).

The Geminids are seen to peak on the 13/14th December. The Ursids are responsible for the peak of activity on the afternoon of 22nd December.

Data was lost to unfavourable propagation conditions on the following dates 15th morning, 23rd, 24th and 25th December.  The reduced counts on the morning of the 29th December 2006 were caused by the loss of reflections from the Liege Bol d'Air transmitter. This suggest that the transmitter was off-air (or operating on reduced power) from 00:00 UT until 08:00 UT on the 29th December 2006.

2005

The following colorgramme shows the radio meteor counts for the month of December 2005. The horizontal axis shows the day of the month and the vertical axis the local time (UT).

The Geminids are seen to peak on the 13/14th December, around solar longitude 262. There's a sample of spectrum plots associated with the peak of the radio Geminids here.

The double humped characteristic of the Geminid record can be understood by reference to the diagram showing the  geometrical effectiveness of a typical forward-scatter receiving system. The highest meteor counts are recorded when the shower radiant aligns with the lobes indicating the receiving system's most effective direction. The lower counts are recorded when the shower radiant is aligned with the axis of the transmit / receive path.

The 21st December 2005 saw a couple of longer echoes possibly associated with the Ursids.

As predicted by the IMO, the Ursids are seen to peak between 11:00 UT and 15:00 UT, around solar longitude 270.7, on the 22nd December 2005.

A prolonged mains power failure on the morning of 16th December 2005 resulted in loss of data after the UPS batteries became discharged. Two hours results were lost to sporadic E in the afternoon of 16th December 2005.

Detection is operating on 55.25MHz, using a three element Yagi, bearing 180 deg ETN and 10 degree elevation.

2004

The following colorgramme shows the radio meteor counts for the month of December 2004. The horizontal axis shows the day of the month and the vertical axis the local time (UT).

The same information is presented as a daily rate in the chart below.

The annual Geminid shower accounts for the peak centred on the 13th December. The Ursids may account for the minor peak on the 22nd December.

Detection is operating on 55.25MHz, using a three element Yagi, bearing 180 deg ETN and 10 degree elevation.

2003

The following colorgramme shows the radio meteor counts for the month of December 2003. The horizontal axis shows the day of the month and the vertical axis the local time (UT).

 

Data is missing on the 15th, 17th and 18th December, due to equipment failure. Very high counts from the morning of the 19th have been manually removed. 

Detection is operating on 55.25MHz, using a three element Yagi, bearing 180 deg ETN and 10 degree elevation.

2002

The following colorgramme shows the radio meteor counts for the month of December 2002. The horizontal axis shows the day of the month and the vertical axis the local time (UT).

 

The Geminids were predicted to peak at 10:00 UT on the 14th of December and probably account for the increased activity seen between the 9th and 15th December. You can see these results in greater detail here.