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4172Re: Propagation of Infrasonic Waves

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  • Robert
    Jul 1, 2005
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      Hi Humlo

      The first site http://www.isla.hawaii.edu/NSF05/Presentations/
      is a directory of power point slides by major author's names.

      The slides are facinating, but upon going thru them it appears to me
      that these scientists are more likely to be able to help us determine
      if the hum is really acoustical in nature or not.

      These all appear to be research organizations that are very interested
      in recording sounds in the air, earth, ocean, and even from the

      I couldn't find a single presentation that mentions "Making" sounds
      other than one that used an explosion to test how well their sound
      equipment could determine the direction to the blast.

      The specific one you mentioned NSF05_Szuberla.ppt is a group
      reporting the fact that the aurora really does make sounds. They
      recorded the sounds and corrolated them to specific auroras and even
      particular parts of an aurora. They didn't cause the aurora to make
      the sound.

      Others were about recording things like the sounds of the recent
      earthquake and tsunami; the last eruption of Mount St.Helens, the
      sounds that a patch of waves far at sea make in the air... all sorts
      of diverse sounds that are 'natural'. In not one did the researchers
      claim to be making any sounds.

      Here is a headline from the first slide presented by Ruiz:

      Here is the summary at the end of the presentation:
      Extensive degassing at Tungurahua shows a wide range of
      seismo-acoustic signals with three main types: EXplosions, ROars, and
      CHugs). More than 95% of all signals recorded at Tungurahua have an
      infrasonic component and, therefore, are related to different modes of

      There are at least 4 families of EXplosions events based on cluster
      analysis of infrasonic waveforms. These clusters do not exhibit
      temporal, suggesting they are related to coexisting explosive processes.

      Epicenters of explosion events are located in two areas: inside the
      crater and <400 m south of active crater. Network geometry do not
      allow precise locations of explosion sources.

      Remarkable delay times between seismic and infrasonic signals are
      observed at all stations. Wind, temperature or humidity variations are
      not likely the main factor. Analysis of these delay times help to
      constrain the region source of EX events at depths ranging from 5 to
      100 m inside the conduit.

      as you can see they're interested in using both the sound in air as
      well as the sound thru the ground.

      All very facinating... One of the bullet items in several of the
      presentation that caught my eye, was that over 90% of the sounds that
      they are currently recording are as yet, un-identified.

      The conference even went into funding available for this type of
      research from the U.S. NSF.

      At any rate, I don't think it has anything to do with the 'making' of
      the hum. However, if the hum proves to be acoustic in nature, I'm
      sure that some one of these groups could locate the source. :)

      the second citation is just a word document outlining a series of
      talks. The site does not contain the talks themselves.
      I've included the entire outline for the seminar below. It would be
      interesting if it contained copies of the talks, but I couldn't find
      anything like that on this site. You might look up the names of the
      people who gave the talks, and ask them to either make them available
      online or to mail you copies.

      If you just navigate to http://ionos-workshop.gi.alaska.edu
      you will find that there is an attendance list of all of the
      presentors, complete with email addresses.


      The second citation:
      The Eleventh Annual RF Ionospheric Interactions Workshop
      17 – 20 April 2005
      Hilton Hotel, Santa Fe, New Mexico
      sponsored by National Science Foundation
      in cooperation with Air Force Research Laboratory, Office of Naval
      Research, and the University of Alaska at Fairbanks

      Program Chairman: James Sheerin, Eastern Michigan University
      Steering Committee: William Bristow, University of Alaska; Edward
      Fremouw, NorthWest Research Associates; Spencer Kuo, Polytechnic
      University; Michael McCarrick, BAE SYSTEMS; Evgenii Mishin, Boston
      College; Wayne Scales, Virginia Tech University Student
      Representative: Rudolfo Cuevas, Cornell University
      Ex Officio: Richard Behnke, National Science Foundation;
      Herbert Carlson, Air Force Office of Scientific Research; Lewis
      Duncan, Rollins College;
      William Gordon, Rice University; Keith Groves, Air Force Research
      Michael Kelley, Cornell University; Edward Kennedy, Naval Research
      Robert Kerr, National Science Foundation; Paul Kossey, Air Force
      Research Laboratory;
      Paul Rodriguez, Naval Research Laboratory; Michael Sulzer, Arecibo

      Workshop Program

      Sunday, April 17, 2005 -- Afternoon
      12:00 - 2:00 & 5:00 - 6:00: Registration
      1:30 - 5:10: Student Tutorial Session – Mesa Ballroom A & B
      Solar-Terrestrial Relations
      Paul Rodriguez and Mike Kelley, Chairpersons
      1:30 - 1:35 Introduction – Paul Rodriguez
      1:35 - 2:15 Global Models of Solar-Terrestrial Interactions – Tamas
      2:15 - 2:55 The Global Ionosphere – Robert Schunk
      2:55 - 3:35 Stormtime Plasma Redistribution and
      Ionosphere-Magnetosphere Coupling – John Foster
      3:35 - 3:50 Break in Promenade Area
      3:50 - 4:30 Basics of the Solar Wind Coupling to the Earth's
      Magnetosphere – Joseph Borovsky
      4:30 - 5:10 Wave-Particle Interactions in the Radiation Belts – Jay Albert

      Evening Reception and Dinner – Ortiz Ballroom
      6:00 – 7:00 Reception
      7:00 – 9:00 Dinner
      After-Dinner Speaker: Carol Hogsett, Los Alamos National Lab
      "Geology of the Jemez Mountains – Northern New Mexico"

      Monday, April 18 – Mesa Ballroom A & B
      7:00 - 8:30 Registration
      7:15 - 8:15 Breakfast buffet in Promenade Area
      8:30 - 8:45 Welcome/Student Introductions – Jim Sheerin, Program Chairman
      8:45 - 9:00 Opening Remarks – Rich Behnke and Paul Kossey
      9:00 - 9:15 Report on the 2004 Summer School – Mike Sulzer
      9:15 - 9:30 Plans for the 2005 Summer School – Bill Bristow
      9:30 -10:00 Early Results for the 2005 Optics Campaign at HAARP –
      Elizabeth Gerken
      10:00-10:15 Break
      10:15-10:35 Simultaneous Radio/Radar Observations during 2005 HAARP
      Campaign – Paul Bernhardt
      10:35-11:15 A Vision for the International Polar Year 2007-2008 –
      Cristina Takacs-Vesbach
      11:15-11:45 Poster Session – Organizer: Mike Sulzer
      5 Minute Overviews by Poster Authors
      11:45-1:15 lunch on your own
      1:15 - 2:45 Poster Talks continued
      2:45 - 3:15 Poster Viewing in Mesa Ballroom C
      3:15 - 3:30 Break
      3:30 - 5:00 Poster Viewing continued (Mesa Ballroom C)

      Tuesday, April 19 – Mesa Ballroom A & B
      7:15 - 8:15 Breakfast buffet in Promenade Area
      8:30 - 9:15 Systematic Response of Geospace Regions – Janet Kozyra
      9:15 - 10:00 ELF/VLF Wave-Injection Experiments and Magnetospheric
      Probing – Umran Inan
      10:00-10:15 Break
      10:15-11:00 HF Propagation Experiments: Past and Future – Gordon James
      11:00-11:45 ELF Generation & Propagation: Polar vs Equatorial – Dennis
      11:45-1:15 lunch on your own
      1:15 - 1:30 Arecibo Heating Facility Update – Michael Sulzer
      1:30 - 1:45 HIPAS Facility Update – Alfred Wong
      1:45 - 2:15 HAARP Facility Update – Ed Kennedy
      2:15 - 2:45 SPEAR Facility Update – Ranvir Dhillon
      2:45 - 3:15 Imaging Riometer at HAARP – Brenton Watkins
      3:15 - 3:30 Break
      3:30 - 4:00 AMISR at HAARP – Brenton Watkins
      4:00 - 4:30 AMISR at Jicamarca – Rudy Cuevas
      4:30 - 5:00 Self Scattering of Powerful HF Waves – Yuri Yampolski

      Wednesday, April 20 – Mesa Ballroom A & B
      7:15 - 8:15 Breakfast buffet in Promenade Area
      8:15 - 8:45 Optics Experiments at SURA – Ludmila Kagan
      8:45 - 9:30 Artificial Optical Emissions near the Second Gyroharmonic
      – Mike Kosch
      9:30 - 10:15 HF-Induced and Natural Airglow – Evgenii Mishin
      10:15 - 10:30 Break
      10:30 - 11:15 Auroral Infrasound: Natural & Stimulated – John Olson
      11:15 - 11:30 Closing Remarks – Jim Sheerin
      11:30 Adjourn
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