› Forums › Radionics › Coronal mass ejection wipes HAM radio band .

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  • March 18, 2013 at 9:19 am #1055398
    thelog
    Participant

      I’m not sure if the title is correct but I followed a youtube link that said CME wipes HAM radio band. If I have got it all wrong feel free to move the thread

      http://www.youtube.com/watch?v=dnx_dI0rrbk

      The National Aeronautics and Space Administration (NASA) on Friday reported that a solar phenomenon called Coronal Mass Ejection (CME) had ejected from Sun towards Earth.



      The phenomenon is different from solar flare and shoots out billions of tons of solar particles in space. And their impact depends on the speed they are ejected.
      The CME reached Earth on March 17 (Sunday) and created a mild solar or geomagnetic storm. The storm ranged to G2 scale and later subsided to G1.
      Also the CME’s impact with Earth’s magnetic field caused Aurora Borealis in the mid latitudes.
      Space Weather.com reported that Auroras were visible in the night sky across the Canadian border stretching far down south to Colorado.
      NASA said that solar storms possibly disrupt electrical systems and satellite based communication systems, but no such instances have been recorded yet.



      The Coronal Mass ejection was captured by European Space Agency and NASA’s Solar Heliospheric Observatory (SOHO) from 3:24 to 4:00 am EDT on Friday.
      The CME was estimated to be travelling at 900 miles per second, which is faster than the usual speed for CMEs.

      On Saturday, the CME passed by NASA’s Advanced Composition Explorer (ACE) as it neared Earth.

      March 18, 2013 at 9:57 am #1269392
      General Lighting
      Moderator

        Coronal ejections certainly do that, and hams tend to notice them quickly and report them across the World (some work with their national governments and defence organisations to do this). but after this has gone the band conditions improve. HF communications are always prone to fading and interference so those using them have to keep changing frequency as the day goes on. Certainly there is a bit more noise today and I can’t hear the Soviet buzzer on 4625

        The HF band isn’t just used for hams but broadcasters and also strategic/military communications between long distance aircraft and aerodromes (including civillian aircraft), a backup system for long distance shipping comms in case of satellite faliures. Russia and China still make extensive use of it….

        That said plasma TVs and power line network adapters are far worse for interference to radio bands (even FM and DAB) than what Nature can provide, I can only listen to HF in a corner of my house because of all the interference.

        March 19, 2013 at 10:52 pm #1269393
        leveret
        Participant

          Amongst other places this CME gave intense auroral displays in Iceland 🙂

          (didn’t even look in hope here as sky’s been cloudy for at least a fortnight ;-( )

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        › Forums › Radionics › Coronal mass ejection wipes HAM radio band .