Wednesday, 4 August 2010

Aurora Watching...

This is taken from a comment on Facebook. Hence why it doesn't make sense, is badly laid out, and probably links to Farmville somewhere on it.

"Is there a site to work out if you can see the aurora?"

Short answer: yes. Longer answer: whether you see anything or not is a bit random, so the best that the sensors can do is tell you if it's worth looking. Plus at these latitudes you'll need to have clear skies and minimal light pollution (unless it's a massive CME - I have seen the aurora from the centre of Edinburgh, but that's very, very rare!)

Anyway, sites. http://spaceweather.com/ is a good place to start for early alerts on CMEs (Coronal Mass Ejections - basically, a sunspot burp). Once a CME is on the way the next place to look is at ACE - the live data from that satellite parked at L1 is at http://www.swpc.noaa.gov/ace/MAG_SWEPAM_24h.html and right now shows what happens as a CME sweeps past it. Not long after that it will hit the atmosphere, and will be picked up by SAMNET - live data at http://www.dcs.lancs.ac.uk/iono/aurorawatch/rt_activity/ - and right now it shows the CME hitting not long after ACE saw it, and a burst of auroral activity a few hours later near midnight (which is the best time). Finally, the one I tend to use most for "is there a chance now" is the RealTime Auroral Oval at http://portal.cssdp.ca:8080/ssdp/static_content/ssdp/rt_oval/index.html - that extrapolates from a bunch of Canadian sensors what size the ring of auroral activity is and how strong it is. If it's white and stretches down over the UK it's definitely worth having a look.

There's a lot of data linked off the main Lancaster Uni Aurorawatch page too.

(And as the Perseid meteor shower should be peaking next weekend, for my own benefit here's a link to the Jodrell Bank Meteor Detector - memo to self, if there's lots of blips go outside! Except - it's offline just now as the Spanish TV station frequency they were detecting reflecting off meteor trails has changed - they've gone digital. Damn you, digital switchover! Alternative site is http://www.tvcomm.co.uk/radio/live.html - also, photography tips at http://britastro.org/blog/?p=410)