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 ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Fri Apr 07 2000 - 08:38:44 PDT