CHORUS.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.WAV Beautiful Alberta Auroral Chours taped during a visible display of Aurora (Northern Lioghts). 42 sec. 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.WAV 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.WAV Loud Dawn Chorus and Hiss, recorded 18 Aug. 1993 in southeastern Oregon's Alvord Desert. 34 sec. 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! A hand held version of the WR-4B is available for $105. Contact Steve McGreevy at: S.P. McGreevy Productions, 45 Elda Drive, San Rafael, CA 94903. E-mail: spmcgrvy@ix.netcom.com -- or -- s.mcgreevy@genie.geis.com