... Darn. I thought we had an exotic pattern of triggered emission. Here, I get screech owls perching on the antenna. They like to perch and they like to...
21479
Paul
paul@...
May 16, 2013 9:28 pm
... Thanks, I'll try to get a bearing on this one and the one on 04-19. Do we have anyone else with orthogonal loops in Europe? We really need a cross bearing...
21480
Tom Becker
b19063
May 16, 2013 9:30 pm
... providing the polarisation... Interesting notion. If an E-field antenna moves vertically through a 100V/m gradient, there certainly should be resulting...
21481
Paul
paul@...
May 16, 2013 9:37 pm
... Probably, if the antenna is displaced uniformly horizontally. But if the base is fixed and the top is wobbling, the capacitance will be modulated and...
21482
Adrian Flynn
k7sva
May 16, 2013 11:24 pm
What do you call a "Light" wind? Where I was living in Arizona a 35 MPH wind is a "Light" breeze. and a heavy wind was anything over 60 MPH, and this is no...
21483
thb201
May 18, 2013 12:57 am
I did some quick and dirty audio processing on these files so I could hear the bird sounds better. On file 1368458772 just fraction of a second before the...
21484
SWPC Product Subscrip...
swpc.products@...
May 18, 2013 1:22 am
Space Weather Message Code: SUMSUD Serial Number: 171 Issue Time: 2013 May 18 0121 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2013 May 18 0112 UTC ...
21485
dl1eds
May 18, 2013 6:28 am
Paul, looking at my GBZ-recordings of that event series on May 13 I noticed a sudden drop of the phase at 12 UT - coinciding (maybe by chance) with the start...
21486
Jean-L. RAULT
f6agr
May 18, 2013 8:17 am
During several VLF campaigns in the country, I experienced various noises generated by bluebottles, honey bees, horseflies, roe deers and farmers. And the...
21487
Paul
paul@...
May 18, 2013 8:36 am
... I have http://abelian.org/vlf/tmp/sid130513b_DCF.gif http://abelian.org/vlf/tmp/sid130513b_DHO.gif http://abelian.org/vlf/tmp/sid130513b_GBZ.gif ...
21488
Paul
paul@...
May 18, 2013 8:44 am
But does Mars have a fairweather field to provide the 'polarising'? I notice that insect noises are worse on thin antennas such as a telescopic whip, much less...
21489
drobnock
drobnock2
May 18, 2013 12:09 pm
Hi The attraction of Fauna by a VLF receiver is not new; it was reported August 1996 at METEORBS. Thomas Ashcraft designed a receiver and antenna based on an...
21490
Paul
paul@...
May 18, 2013 12:34 pm
Interesting about the bats being drawn to the receiver. One of my projects this summer is to detect seepage locations around the nearby reservoir. I plan to...
21491
thb201
May 18, 2013 5:32 pm
Is it just me or do others have trouble viewing the spectra on Paul's site? The thumbnails look OK but when I open the image up it's very dark and I can...
21492
Paul
paul@...
May 18, 2013 6:14 pm
... It's not you John - the images really are dark. I will try some different settings. -- Paul Nicholson --...
21493
Paul
paul@...
May 18, 2013 8:52 pm
I made a trial alteration the spectrogram settings on vlf1 (Todmorden) events of the last 10 days. For comparison, only events with an odd number of minutes...
21494
Tom Becker
b19063
May 19, 2013 12:06 am
FYI, if anyone else is controlling gain via /amixer/, note that there appears to be a control range glitch between 0.0 and 1.0dB. Small gain increments...
21495
mark
marky26_uk
May 19, 2013 1:51 am
Hi all, Chorus being received now, time 01:41 UTC, received on both UK streams & Germany. Mark...
21496
Paul
paul@...
May 19, 2013 3:05 am
Nice chorus, ongoing at Sheffield and Todmorden http://abelian.org/vlf/ -- Paul Nicholson --...
21497
john heath
id2143
May 19, 2013 3:18 pm
Hi Jean and John  A sound wave when air is ionized such as after rain when air is slightly more positive should cause a E type antenna to be micro-phonic...
21498
SWPC Product Subscrip...
swpc.products@...
May 19, 2013 11:25 pm
Space Weather Message Code: SUMSUD Serial Number: 172 Issue Time: 2013 May 19 2322 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2013 May 19 2306 UTC ...
21499
Tom Becker
b19063
May 21, 2013 12:20 am
13000+ cloud-to-ground strikes in 15 minutes from lightning storm O-89 over Arcadia, Florida, halfway between Sebring and Cape Coral, this afternoon - some...
21501
ssshoema
May 21, 2013 12:10 pm
In the setup process of VLF reception and noise reduction I had (have)a peak centering at 10khz which I have not been able to resolve-- ... I am also having to...
21502
Mark Dennison
marky26_uk
May 21, 2013 6:02 pm
Hi, A resistor in parallel will help, you'll have to try different values but this would bring the sharp peak down, you'll then probably have to add more gain...
21503
Thomas Ashcraft
heliotown27
May 21, 2013 10:09 pm
There have been strong storms ( and tornadoes ) in the Oklahoma region the past few days and I have captured about forty sprites. Visual conditions have been...
21504
Paul
paul@...
7:08 am
Waveforms, with the signals time shifted to remove propagation delay from the source at 35.9652N,97.4735W http://abelian.org/vlf/tmp/ta130519a1.png Top to...
21505
Paul
paul@...
10:25 am
I got some X-ray flux density data from SOHO archives (15 second resolution) and plotted it against the SID response of NRK (5 second resolution), ...
21506
Thomas Ashcraft
heliotown27
2:03 pm
May 22, 2013 GOES is down at the moment for check of magnitude but there is a huge flare in progress at 1400 UT. Should be a SID in progress as well. I have...
21507
SWPC Product Subscrip...
swpc.products@...
2:43 pm
Space Weather Message Code: SUMXM5 Serial Number: 103 Issue Time: 2013 May 22 1443 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2013 May 22 1230 UTC ...
