Starship Asterisk*

JohnD wrote:
Is such an auroral circle centered on the Pole?

APOD Robot wrote:On this night, the sky was not only the best show in town, but a composite image of the sky won an international competition for landscape astrophotography.

APOD Robot wrote: A Starry Night of Iceland

The above winning image was taken two months ago
over Jökulsárlón, the largest glacial lake in Iceland.

http://en.wikipedia.org/wiki/J%C3%B6kuls%C3%A1rl%C3%B3n wrote:
<<The picturesque scene of the Jökulsarlon lagoon and the Breiomerkkujokull glacier have been part of the James Bond films A View to a Kill (1985) and Die Another Day (2002), as well as Batman Begins (2005). The popularity of the glaciers could be attributed to these blockbuster films, to Lara Croft's Tomb Raider. Choreographing the car chase scene, which is termed as the greatest movie car chase of all time, between a Jaguar and Aston Martin, a set that was created for the film at the location of the lagoon was a challenge to 'Action Unit' Director Vic Armstrong, of the Bond film Die Another Day.>>

neufer wrote:

JohnD wrote:
Is such an auroral circle centered on the Pole?

No.

The furthest away one can see the bottom of an aurora is about 10º latitude
and the Jökulsarlon lagoon is around 26º latitude away from the North Pole.

Someone at the North Pole cannot even observe any part of this auroral circle

biddie67 wrote:
Neufer - I've been wondering all day about this visual window of "10º latitude" for being able to see the bottom of an aurora. Is it because the bottom of the aurora isn't that high in altitude?

biddie67 wrote:Thanks.... but I'm having a hard time getting this - it isn't intuitive - I can see a plane that is much lower than 100 KM all the way to the apparent horizon which is a lot more than 10 degrees from vertical.

JLewis98856 wrote:I am fairly new to astronomy. I have some binoculars and a small refracting telescope (National Geographic model).
Can anyone give me a hint on today's APOD? Where are the Pleiades and where is the Andromeda Galaxy (roughly)?

JLewis98856 wrote:I am fairly new to astronomy. I have some binoculars and a small refracting telescope (National Geographic model).
Can anyone give me a hint on today's APOD? Where are the Pleiades and where is the Andromeda Galaxy (roughly)?

http://tinyurl.com/6cgsrrz wrote:
<<Delia Bacon [was] described by Emerson in 1857 as "with genius, but
mad". Born in a log cabin on the Ohio frontier, she endured precarious
health and grim poverty, eking out a living as a teacher - by all
accounts an inspiring one - of young women. She was a friend of
*Samuel Morse* , a writer of money-losing "closet dramas", and, in the
end, obsessed with proving that Bacon wrote Shakespeare, to the extent
of keeping a mad watch on his grave armed with disinterring tools
(but losing her nerve at the last minute). The story of the terrible
decline of this mind into obsessional madness is harrowing; finally,
in 1856, she produced the 600-page Philosophy of Shakespere's Plays
Unfolded and awaited her reviews and, she believed, her vindication.
Nobody read it. Delia Bacon was ultimately committed to an asylum,
first by the mayor of Stratford-on-Avon and after her return to
the United States by her brother to the Hartford Retreat,
an asylum in Connecticut, where she died on September 2, 1859.
Nathaniel Hawthorne noted after her death that
"no author ever hoped so confidently as she;
none ever failed more utterly.">>

http://tinyurl.com/6yv4au wrote:
<<[Delia Bacon] had met *Samuel Morse* in New York while he was
teaching art at NYU. It was Morse who told her about Bacon's
ciphers that he had used during his diplomatic work. This little
fact sparked her idea that the Shakespeare plays were written
in a code to hide their political philosophies.>>

http://en.wikipedia.org/wiki/Aurora_%28astronomy%29 wrote:
<<The auroras that resulted from the "great geomagnetic storm" on September 2, 1859, is thought the most spectacular in recent recorded history. The September 2, 1859, storm was a result of the exceptionally intense Carrington-Hodgson white light solar flare on September 1, 1859, produced auroras so widespread and extraordinarily brilliant that they were seen and reported in published scientific measurements, ships' logs and newspapers throughout the United States, Europe, Japan and Australia. It was reported by the New York Times that in Boston on Friday September 2, 1859, the aurora was "so brilliant that at about one o'clock ordinary print could be read by the light". One o'clock Boston time on Friday 2 September, would have been 6:00 GMT and the self-recording magnetograph at the Kew Observatory was recording the geomagnetic storm, which was then one hour old, at its full intensity. Between 1859 and 1862, Elias Loomis published a series of nine papers on the Great Auroral Exhibition of 1859 in the American Journal of Science where he collected world wide reports of the auroral event. The aurora is thought to have been produced by one of the most intense coronal mass ejections in history, very near the maximum intensity that the Sun is thought to be capable of producing. It is also notable for the fact that it is the first time where the phenomena of auroral activity and electricity were unambiguously linked. This insight was made possible not only due to scientific magnetometer measurements of the era but also as a result of a significant portion of the 125,000 miles of telegraph lines then in service being significantly disrupted for many hours throughout the storm. Some telegraph lines however seem to have been of the appropriate length and orientation to produce a sufficient geomagnetically induced current from the Electromagnetic field to allow for continued communication with the telegraph operators' power supplies switched off. The following conversation occurred between two operators of the American Telegraph Line between Boston and Portland, Maine, on the night of September 2, 1859, and reported in the Boston Traveler:

• ..................................................
  Boston operator (to Portland operator): "Please cut off your
  battery [power source] entirely for fifteen minutes."
  
  Portland operator: "Will do so. It is now disconnected."
  
  Boston: "Mine is disconnected, and we are working with
  the auroral current. How do you receive my writing?"
  
  Portland: "Better than with our batteries on.
  - Current comes and goes gradually."
  
  Boston: "My current is very strong at times, and we can work
  better without the batteries, as the aurora seems to neutralize and
  augment our batteries alternately, making current too strong at times
  for our relay magnets. Suppose we work without batteries
  while we are affected by this trouble."
  
  Portland: "Very well. Shall I go ahead with business?"
  
  Boston: "Yes. Go ahead."
  ..................................................

The conversation was carried on for around two hours using no battery power at all and working solely with the current induced by the aurora, and it was said that this was the first time on record that more than a word or two was transmitted in such manner. Such events led to the general conclusion that the effect of the Aurora on the electric telegraph is generally to increase or diminish the electric current generated in working the wires. Sometimes it entirely neutralizes them, so that, in effect, no fluid is discoverable in them . The aurora borealis seems to be composed of a mass of electric matter, resembling in every respect, that generated by the electric galvanic battery. The currents from it change coming on the wires, and then disappear: the mass of the aurora rolls from the horizon to the zenith.>>

JLewis98856 wrote:Can anyone give me a hint on today's APOD? Where are the Pleiades and where is the Andromeda Galaxy (roughly)?