New evidence indicates auroras occur ...

New evidence indicates auroras occur outside our solar system

There are 6 comments on the 24dash story from Jan 21, 2013, titled New evidence indicates auroras occur outside our solar system. In it, 24dash reports that:

University of Leicester planetary scientists have found new evidence suggesting auroras - similar to Earth's Aurora Borealis - occur on bodies outside our solar system.

Join the discussion below, or Read more at 24dash.

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Jan 23, 2013
nice idea and observation.

Should also be very useful in identifying in particular cool & "room temperature" brown dwarves.

Note that while in the galactic disc all of these objects (up to & probably including red dwarves) will accrete mass from the interstellar medium.

This will also have an interesting proviso in that ultracool brown dwarves & free floating planets will not last long if they orbit in the galactic plane, as they will get "dumped on" by any GMC they drift into on the way through spiral arms. Useful in modelling stars in associations which may have begun as low mass objects a fair time before emergence from a GMC.
It also implies that ultracool brown dwarves are likely a part of the thick disc or galactic halo, with a very short time spent in the galactic disc per orbit.

Have a nice day: Ag
SpaceBlues

United States

#2 Jan 23, 2013
Hey aG, maybe the black holes are green after all.

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#3 Jan 23, 2013
SpaceBlues wrote:
Hey aG, maybe the black holes are green after all.
Actual colour is "violet with a hint of pink on the inner edge of the ring".

Have a nice day: Ag
SpaceBlues

United States

#4 Jan 23, 2013
Adrian Godsafe MSc wrote:
<quoted text>
Actual colour is "violet with a hint of pink on the inner edge of the ring".
Have a nice day: Ag
Have a pic?

Mine is for the inside.

Have a nice day, too.
SpaceBlues

United States

#5 Jan 28, 2013

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#6 Jan 30, 2013
SpaceBlues wrote:
http://www.livescience.com/264 38-black-holes-first-images.ht ml
Fascinating.
Interesting indeed.

The important part is that black holes are rotating at very close to c and the event horizon is at the "planck temperature" where photons have so much energy that the generate event horizons. The result is that Hawking radiation poduces a set of shortlived particles that eventually collide with the event horizon that spawned them and are re absorbed into the event horizon.

As the particles are on average sweeping around the black hole at close to the rotation rate, the result is an associated ferocious magnetic field. The resulting "Drag & spin" effect always produces an equatorial accretion disc & drag & spin disc @ distance reacting to stay equatorial up to the distance from the black hole where the "Drag & spin" effect decays out.

An isolated black hole will therefore produce an equatorial aurora.
The drag & spin effect will also produce approach velocity & recession velocity effects on the colour of an auroral emmission in situations where limited accretion occurs (interstellar medium). Redsfift effects will also occur close to the black hole as a result of gravitational redshift effects.

Resulting hiigh energy auroral emmision is ethereal violet similar to the initial glow of a surface test nuke. The glow is widest and closest to the black hole on the approaching side, and narrowest & furthest on the receding side, the redshift effect produces a white spectrum on the inner edge with red showing up closest to the black hole where gravitational redshift effects occur.

Seen close to the equator the auroral effect will cross the disc of the black hole defined by edge lensing of background stars.

Have a nice day: Ag

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