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Having trouble receiving radio?:- Ionospheric Lift

  • 02-06-2005 5:38pm
    #1
    BobTheBeat
    Registered Users, Registered Users 2 Posts: 1,048 ✭✭✭


    Has anyone been having trouble receiving FM transmissions of late? Turns out this has been caused by the earths orbital cycle about the sun. What I gather is the sun heats the ionosphere which in turn causes it to lift, thus disrupting the transmission of our localised FM stations. This would also explain why we can receive cintinental european transmissions, as the RF waves can reflect a much greater difference. How cool is that???

    But this also caused me some concern.I wonder is there a link between this ionospheric lift and possible extensive testing of the america DoD's HAARP program. I had read about it many years before adn was intrigued. You can read about it here . The project has been under development since the 80's and has gone through phased operation ('94,'97,2002) to date. Basically its an array of antennae (360) which transmit up into the ionosphere and excite a small area of it. I wonder were they testing in the past week?Would be interesting to find out!


Comments

  • #2
    albertw
    Closed Accounts Posts: 395 ✭✭albertw


    There has been a lot of solar activity of late which can permit FM communication over longer distances. It hasnt been strong enough to cause problems to regular FM transmissions, which are fairly local and near enough line of sight. Very extreme solar activity will cause all sorts of problems to communications - flares causing satellites to be taken offline for example.

    One Irish Amateurs logs of contacts during aurora activity are at http://www.qsl.net/ei5fk/

    There is nothing very special about it, short wave signals propogate around the world by bouncing off the upper atmosphere as standard practice.

    HAARP is a program specifically designed to study the effects of an aurora on the atmosphere and to see if it can be replicated. The ARP bit is for Active Auroral Research Program. The active antenna that it uses would be very pale in comparison to even low auroral activity on the upper atmosphere. Remember Aurora are caused by charged particles from the sun travelling at up to 1000km/s which spiral down through the Earhs magnetic field, an antenna in the US somewhere cannot cause that sort of disruption.

    Cheers,
    ~Al


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