Re: Aurora + Sunsat

From: Tony Beresford (starman@camtech.net.au)
Date: Fri Apr 07 2000 - 08:38:52 PDT

  • Next message: Patrice Gambaro: "Re: Aurora (off topic)"

    At 22:20 7/04/00 , Mir16609@aol.com(Don Gardner) wrote:
    >
    >Last evening I had the absolute worst shortwave reception ever while 
    >observing.  All 4 WWV stations and the Canadian station (7.335MHz?) were 
    >inaudible most of the evening.  If there were aurora sightings perhaps the 
    >solar activity that caused the aurora was also interfering with the SW 
    >signal.  
    Magnetic storms play havoc with the ionosphere Don. After maybe an intial
    increase in electron density, the maximum electron density, and summed
    electro content usually drop markedly. this is due both increased loss
    processes for electrons (everything is probably 50% hotter for example), and bulk motions due to storm effects. in addition
    increased ionization below 100Km puts up absorbtion of HF( The electrons
    collide with molecules moving the energy of the radio wave into thermal
    energy of the neutral atmosphere.
    Tony Beresford
    
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