(meteorobs) Leonids radio observations near Paris, France
Jean-Louis.RAULT at fr.thalesgroup.com
Jean-Louis.RAULT at fr.thalesgroup.com
Wed Nov 22 11:28:28 EST 2006
Dear all
To get a better estimation of the Leonids 2006 peak time(s), and knowing that the results of the software "meteor automatic counters" are subject to many artefacts, I used a fine frequency spectral analysis to MANUALLY count any echoes displayed between 03:00 and 06:00 UTC, which is a quite boring task :o)
I sorted the echoes in two types: underdense and overdense, according to their duration.
The figures are as follows:
UTC+1 Underdense Overdense
04:05 60 4
04:15 62 2
04:25 67 6
04:35 65 9
04:45 54 9
04:55 47 7
05:05 73 12
05:15 66 10
05:25 74 12
05:35 61 13
05:45 64 18
05:55 53 20
06:05 66 18
06:15 58 17
06:25 62 13
06:35 64 14
06:45 60 12
06:55 69 5
Each manual count corresponds to a 10 minutes time slice.
The corresponding curves (available on demand) show that:
- the underdense echoes don't present any particulatr peak during that period (does it means that it was only the ordinary sporadic daily flux ?)
- the overdense echoes present a clear peak at 04:55 UTC +/- 5 minutes.
At the moment, I only analysed the 3 to 6 UTC time period on the 19th of november.
So my conclusion presently is that there was at least one radio peak around 4:55 UTC.
When time permits, I'll manually count some other time periods ...
Kind regards
Jean-Louis Rault
P.S.: The software I used to perform the Doppler frequency fine analysis allowing to separate large and faint echoes is Spectrum Lab from Wolfgang Büscher DL4HYF
> -----Message d'origine-----
> De : meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org]De la part de
> Jean-Louis.RAULT at fr.thalesgroup.com
> Envoyé : mardi 21 novembre 2006 16:51
> À : meteorobs at meteorobs.org
> Objet : (meteorobs) Leonids radio observations near Paris, France
>
>
> Dear all,
>
> Please find below my rough counts of radio echoes here near
> Paris, France, for the 19th of november 2006
>
> UTC+1 10dB 20dB 30dB 10dB 20dB 30dB
> 00:00 73 15 2 130 27 4
> 00:10 68 21 4 125 37 6
> 00:20 63 22 2 119 29 4
> 00:30 70 20 6 112 36 6
> 00:40 63 19 2 132 31 4
> 00:50 58 14 3 96 21 3
> 01:00 62 13 4 108 25 5
> 01:10 59 17 4 112 29 4
> 01:20 74 21 1 135 33 1
> 01:30 53 13 4 82 20 4
> 01:40 63 14 4 121 35 9
> 01:50 69 6 0 103 7 0
> 02:00 55 26 4 110 35 4
> 02:10 61 17 3 115 32 4
> 02:20 71 15 2 144 27 3
> 02:30 74 19 2 164 48 5
> 02:40 65 11 0 107 17 0
> 02:50 62 18 3 129 27 3
> 03:00 67 28 3 195 49 3
> 03:10 56 21 1 182 51 1
> 03:20 53 25 1 161 58 1
> 03:30 76 19 2 167 39 2
> 03:40 69 18 2 140 36 2
> 03:50 65 16 2 151 40 3
> 04:00 66 11 2 96 13 2
> 04:10 66 23 4 170 58 5
> 04:20 77 29 3 154 49 3
> 04:30 76 23 1 158 33 1
> 04:40 64 17 2 159 31 2
> 04:50 80 27 4 157 37 4
> 05:00 49 34 15 367 189 32
> 05:10 78 19 0 156 32 0
> 05:20 82 22 4 172 52 18
> 05:30 76 18 4 183 44 7
> 05:40 60 32 14 346 174 63
> 05:50 65 27 7 257 94 20
> 06:00 88 23 5 166 37 9
> 06:10 80 38 3 256 62 4
> 06:20 75 20 1 136 27 3
> 06:30 81 16 3 153 34 7
> 06:40 86 24 1 184 38 2
> 06:50 75 17 5 156 37 10
> 07:00 75 17 1 212 58 3
> 07:10 66 19 4 147 37 7
> 07:20 76 33 3 234 67 4
> 07:30 76 19 2 129 23 3
> 07:40 76 23 5 182 45 6
> 07:50 78 28 1 190 56 1
> 08:00 67 28 5 156 50 7
> 08:10 70 14 1 144 27 1
> 08:20 62 25 13 355 125 33
> 08:30 84 21 2 393 41 2
> 08:40 91 18 0 272 23 0
> 08:50 55 18 3 114 31 4
> 09:00 44 8 0 71 9 0
> 09:10 83 13 1 176 19 1
> 09:20 65 11 2 128 27 8
> 09:30 55 28 4 307 138 7
> 09:40 65 9 1 159 19 2
> 09:50 64 16 2 121 25 2
> 10:00 54 13 3 159 49 6
> 10:10 51 20 7 229 107 10
> 10:20 86 20 2 219 47 3
> 10:30 92 14 1 213 18 1
> 10:40 46 35 1 252 118 1
> 10:50 58 24 2 174 42 5
> 11:00 71 12 0 117 14 0
> 11:10 66 20 1 181 46 1
> 11:20 80 22 1 240 39 2
> 11:30 80 18 6 219 54 20
> 11:40 85 9 2 181 16 2
> 11:50 71 18 0 161 42 0
> 12:00 68 16 1 187 37 1
> 12:10 80 16 1 220 21 1
> 12:20 67 18 1 146 36 1
> 12:30 87 10 0 143 13 0
> 12:40 88 13 1 164 26 1
> 12:50 55 12 15 409 245 193
> 13:00 62 17 1 208 49 1
> 13:10 74 17 2 154 27 2
> 13:20 77 14 2 155 21 3
> 13:30 81 11 0 162 15 0
> 13:40 91 11 1 194 25 1
> 13:50 77 5 1 227 14 2
> 14:00 58 8 1 148 13 1
> 14:10 65 10 3 178 52 31
> 14:20 74 7 0 141 12 0
> 14:30 36 10 2 101 15 2
> 14:40 29 2 0 78 3 0
> 14:50 46 9 1 89 14 1
> 15:00 40 8 1 100 18 1
> 15:10 25 6 0 80 6 0
> 15:20 31 2 0 67 2 0
> 15:30 33 4 0 52 5 0
> 15:40 27 6 2 47 13 4
> 15:50 27 6 5 96 39 10
> 16:00 34 18 1 123 35 2
> 16:10 28 3 2 46 7 3
> 16:20 35 5 1 58 8 2
> 16:30 30 7 0 53 9 0
>
> So it looks like a first peak of strong echoes appeared
> between 04:00 and 04:10 UTC and a second one between 04:40
> and 04:50 UTC.
> These data, automatically collected at home with HROFFT +
> ColorLab will be confirmed or corrected in the next future by
> a manual count using SpecLab, because it clearly looks like
> some masking effects and amplitude fluctuations coming from
> strong echoes totally fool the automatic counting softwares.
> The radio station consists in a turnstile antenna, and AOR
> AR5000A receiver tuned in SSB mode on Nevacerrada TV
> transmissions (48.250 MHz).
> Location: 48° 40' 19" N
> 02° 19' 38" E
>
> Best regards
>
> Jean-Louis Rault F6AGR
>
>
>
>
>
>
>
>
> > -----Message d'origine-----
> > De : meteorobs-bounces at meteorobs.org
> > [mailto:meteorobs-bounces at meteorobs.org]De la part de
> Michael Boschat
> > Envoyé : dimanche 19 novembre 2006 10:47
> > À : Global Meteor Observing Forum
> > Objet : (meteorobs) Re: Leonid peak at 04:55 UT
> >
> >
> > Hi all from foggy Halifax:
> >
> > I had 25 minutes of a semi-clear sky about 0325 UT lim. mag
> > about 3.5 -
> > but saw no meteors :(
> >
> > As for the radio results...a tad poor, I heard no enhancement
> > all night.
> > My results
> > are as follows.
> >
> > The possibility of an increase in rates the online NASA
> site was most
> > likely because
> > they are using a lower frequency 67.25 Mhz and have a better system
> > setup than I
> > use.
> >
> > --
> >
> > Clear skies
> > ===========
> > Michael Boschat
> > Royal Astronomical Society of Canada - Halifax Center
> > Astronomy page: http://www.chebucto.ns.ca/~aa063
> >
> >
> ---
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