Hi Hugh, long time no chat :-)) I think you are refering to this one on the 13th ... SUMMARY: X-ray Event exceeded X1 Begin Time: 2013 May 13 1548 UTC Maximum...
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Paul
paul@...
May 15, 2013 2:25 pm
Here are some plots from Todmorden for that event http://abelian.org/vlf/tmp/sid130513a_DCF.gif http://abelian.org/vlf/tmp/sid130513a_DHO.gif ...
Hi Hugh, ... Here are some plots from Kiel: 135.43 kHz (hga22, Budapest): http://df3lp.de/cgi-bin/hga22/plot_channel.cgi?date=2013-05-13 66.66 kHz (RBU,...
21472
Paul
paul@...
May 15, 2013 8:16 pm
Yesterday evening there were some wild variations of signal from Cumiana, swinging from +1 to -1 http://abelian.org/vlf/tmp/1368561093.795.png ...
Hi Dave, you still out here? did you come across any more interesting books that you were going thru? The one I mentioned below by the McCallie Mfg, did you...
Peter, Paul, Alan, Group, Thankyou for your comments, and the interesting links. My data was indeed from the 13th May. Seeing the pronounced dip in signal...
Hi Hugh, ... No, they didn't. Otherwise we all should have noticed that... ... May be you subtracted instead of adding the time-diff - and got the data from...
21476
Paul
paul@...
May 16, 2013 8:43 pm
... Thanks. That means the AGC won't have to spend time settling after a reboot. I remembered vtstat has a -E option, so vtcat not required... vtstat -iE20...
21477
Paul
paul@...
May 16, 2013 8:48 pm
Hugh, Just plot the entire day, midnight to midnight UT, then we easily see what you're picking up there. As Peter says, your plot of the flare looks like a...
21478
Paul
paul@...
May 16, 2013 9:16 pm
... 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...
... 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...
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...
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...
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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 ...
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...
During several VLF campaigns in the country, I experienced various noises generated by bluebottles, honey bees, horseflies, roe deers and farmers. And the...
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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...
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...
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...
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...
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...
