G7IZU RRD NEWS (VH Alert)

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G7IZU RRD NEWS - 01 DEC 2011

The Draconids shower performed excellently and produced a very sharp peak on 
radio systems around the world. Shower activity increases further this month 
with the LEONIDS, URSIDS and QUADRANTIDS waiting in the wings (see below).

My VLF solar flare detector has now been fine tuned (following a few flares 
during the past few days) so my confidence in the system is building. I'm even 
starting to detect flare activity during night-time hours, which had been 
thought by many not to be possible!


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UPCOMING METEOR SHOWERS
Peak dates/times/ZHR

LEONIDS (LEO)
2011-11-06 to 2011-11-30
Peak 2011-11-18 ZHR 20+ var* (see note below)

URSIDS (URS)
2011-12-17 to 2011-12-26 ZHR 10 (occ var upto 50)
Peak 2011-12-23 02h to 04h UT

QUADRANTIDS (QUA)
2011-12-28 to 2012-01-12 ZHR 6~200 var
Peak 2012-01-04 07h20 UT

* LEO: Jérémie Vaubaillon has indicated part of the 1800 AD dust trail may be 
encountered around 22h36m UT on November 16, and could produce ZHRs of ~ 200. 
Unfortunately, the dust particles involved are expected to be exceptionally 
small, of order 10?100 microns, and this could mean no optically-detectable 
meteors at all. This activity may be observable instead as an increase in 
underdense radio meteor echoes, by those systems capable of recording the 
equivalent of such 'invisibly-faint' meteors, and by sensitive radar meteor 
systems. Mikhail Maslov has proposed that there may be two peaks, one on 
November 17, around 21h UT, when ZHRs may be ~ 5?10 above the underlying 
'normal' activity, the second on November 18 near 23h UT, with ZHRs of ~ 10 
above normal. Taking the typical ZHR to be ~ 10?15 could suggest ZHRs at either 
might be ~ 20 ± 5. The second peak he noted may produce somewhat fainter than 
average meteors, however. Another potential maximum time is that given above f
 or the nodal crossing, when ZHRs are liable to be simply 'normal'.




Predictions are from the IMO Meteor Shower Outlook and Calendar.

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SYSTEM
55 MHz system ON
143 MHz system OFF
VLF SID detector system ON

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