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G0FTD > VLF 10.12.03 21:44l 75 Lines 2853 Bytes #999 (0) @ WW
BID : C00191G0FTD
Read: DB0FHN GUEST DJ2RT DG9NBR
Subj: VLF zip files info.
Path: DB0FHN<DB0RGB<DB0MRW<OK0PPL<DB0RES<ON0AR<7M3TJZ<WB0TAX<ZL2TZE<GB7YFS<
GB7WIG
Sent: 031210/1707Z @:GB7WIG.#34.GBR.EU #:32889 XFBB7.03 Bid:C00191G0FTD
From: G0FTD@GB7WIG.#34.GBR.EU
To : VLF@WW
Earlier on this year I rediscovered some VLF files on an old floppy.
They were sent on packet in about 1996, the text was sent but the
recordings were.wav files and of course were far too large for the packet
network, being 3 or 4 Mb in size.
Since then we have got MP3, and so I've converted them and edited them down
to a suitable size without losing their educational value.
In another file I have sent the text that accompanied the files.
They are all sent as VLF@WW
Quoted below is the text which comes with the MP3 files to whet your
appetites. (I never wrote it though !)
(Note - I have changed the reference to wav files to MP3 to avoid confusion)
VLF_MP3.ZIP GUIDE TO FILES CONTAINED IN THIS ZIP FILE:
---------------------------------------------------
All Natural Radio recordings were recorded by Stephen P. McGreevy
using the McGreevy WR-4B E-Field VLF receiver and 10' (3 meter)
vertical antenna. Tape recorder used was a Marantz PMD 212.
Files were converted to .WAV files using a SoundBlaster 16
card and Wave 'OLE or WaveEditor. The following files were
recorded at 8 bit, 11 kHz sampling rate. (The antenna and front-
end circuit of the WR-4B whistler receiver was temporarily attached
to my van via bungee cord) and the control box sits next to beds in back.
1) ALB_CHOR.MP3 Beautiful Alberta Auroral Chours taped during
a visible display of Aurora (Northern Lioghts).
I was located 150 miles east of Red Deer, AB
Near Consort, AB. In this segment, squawking
"chorus" is accompanied by a multitude of
"sliding-tone emissions." When these sliding-
tones would be heard, the aurora wouls suddenly
brighten up and move quicker. Taped 26 Sept. 1993
at 1115 UTC.
2) BC_CHOR.MP3 Very loud Auroral Chorus taped during rare severe
magnetic storm. I was located nexe to Eve's River
in northern Vancouver island, BC, Canada on
21 Feb. 1994 at 1045 UT. Aurora was visible through
partial cloud cover and moonlight. This mag. storm
also nearly wiped out HF (SW) reception.
3) ORECHORS.MP3 Loud Dawn Chorus and Hiss, recorded 18 Aug. 1993
in southeastern Oregon's Alvord Desert.
1430 UTC, 0730 PDT. Major magnetic storm
in progress. Magnetic field
"micro-pulsations" are very evident (slow
undulations in the hiss/chorus every 3-4 sec
similar to ocean waves.
Natural Radio emissions such as these occur in the 0.1 to 11 kHz radio
spectrum--essentially, they are audio-frequency radio waves! This is
just a small variety of fascinating "sounds" to be received at these
ELF/VLF frequencies. You must be located at least 1 to 2 miles from
any power-lines so their "hum" is not received. This is why I like
to listen in the NV high-desert and Great Basin Area--plenty of open
spaces!
- Andy -
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