APOD

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Re: APOD

Post by TopContender on Mon May 24 2010, 14:12

They did the same thing to Ceseare Borgia. Borgia was put in a church after 500 years. They figured he suffered enough.
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Re: APOD

Post by Revs on Sun May 30 2010, 09:32

where was our discussion on the sun cycle?

anyway...

Solar Scientists Agree That the Sun's Recent Behavior Is Odd, but the Explanation Remains Elusive
The most recent solar minimum was both long and pronounced. But why?

http://www.scientificamerican.com/article.cfm?id=solar-minimum-forecasting
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Re: APOD

Post by Revs on Thu Dec 16 2010, 04:35

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Re: APOD

Post by PLAYLIFE on Thu Jan 06 2011, 04:58

Revs wrote:


Was looking at the same video a few weeks ago too.


Here's an awesome bit of software, good fun!

http://universesandbox.com/
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Re: APOD

Post by Revs on Thu Jan 13 2011, 01:23

that software tends to make my head hurt, but its interesting... i need to work out how to use it properly.




on a more scarey note:
http://science.nasa.gov/science-news/science-at-nasa/2010/12jan_cometstorm/
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Re: APOD

Post by Revs on Mon Jan 24 2011, 12:02

vote for the APOY (APOD of the year)

http://bb.nightskylive.net/asterisk/viewtopic.php?f=29&t=22695
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Re: APOD

Post by Revs on Sun Feb 13 2011, 03:13

the suns shooting plasma bullets out of a sunspot thats coming back around the horizon again...

pale

http://spaceweather.com/swpod2011/12feb11/plasmabullet_color.mov?PHPSESSID=jp5f7i1ffcrdj3rpjf44fsbsi6
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Re: APOD

Post by Revs on Wed Mar 02 2011, 23:14

Researchers Crack the Mystery of the Missing Sunspots
http://science.nasa.gov/science-news/science-at-nasa/2011/02mar_spotlesssun/


March 2, 2011: In 2008-2009, sunspots almost completely disappeared for two years. Solar activity dropped to hundred-year lows;  Earth's upper atmosphere cooled and collapsed; the sun’s magnetic field weakened, allowing cosmic rays to penetrate the Solar System in record numbers. It was a big event, and solar physicists openly wondered, where have all the sunspots gone?  


Now they know. An answer is being published in the March 3rd edition of Nature.

Spotless Sun (conveyor belt, 200px)


In this artistic cutaway view of the sun, the Great Conveyor Belt appears as a set of black loops connecting the stellar surface to the interior. Credit: Andrés Muñoz-Jaramillo of the Harvard CfA.


"Plasma currents deep inside the sun interfered with the formation of sunspots and prolonged solar minimum," says lead author Dibyendu Nandi of the Indian Institute of Science Education and Research in Kolkata. "Our conclusions are based on a new computer model of the sun's interior."


For years, solar physicists have recognized the importance of the sun's "Great Conveyor Belt." A vast system of plasma currents called ‘meridional flows’ (akin to ocean currents on Earth)  travel along the sun's surface, plunge inward around the poles, and pop up again near the sun's equator.  These looping currents play a key role in the 11-year solar cycle.  When sunspots begin to decay, surface currents sweep up their magnetic remains and pull them down inside the star; 300,000 km below the surface, the sun’s magnetic dynamo amplifies the decaying magnetic fields.  Re-animated sunspots become buoyant and bob up to the surface like a cork in water—voila!  A new solar cycle is born.


For the first time, Nandi’s team believes they have developed a computer model that gets the physics right for all three aspects of this process--the magnetic dynamo, the conveyor belt, and the buoyant evolution of sunspot magnetic fields.


"According to our model, the trouble with sunspots actually began in back in the late 1990s during the upswing of Solar Cycle 23," says co-author Andrés Muñoz-Jaramillo of the Harvard-Smithsonian Center for Astrophysics. "At that time, the conveyor belt sped up."


The fast-moving belt rapidly dragged sunspot corpses down to sun's inner dynamo for amplification. At first glance, this might seem to boost sunspot production, but no. When the remains of old sunspots reached the dynamo, they rode the belt through the amplification zone too hastily for full re-animation.  Sunspot production was stunted.

Spotless Sun (spotless days, 550px)


Sunspot cycles over the last century. The blue curve shows the cyclic variation in the number of sunspots. Red bars show the cumulative number of sunspot-less days. The minimum of sunspot cycle 23 was the longest in the space age with the largest number of spotless days. Credit: Dibyendu Nandi et al.


Later, in the 2000s, according to the model, the Conveyor Belt slowed down again, allowing magnetic fields to spend more time in the amplification zone, but the damage was already done.  New sunspots were in short supply.  Adding insult to injury, the slow moving belt did little to assist re-animated sunspots on their journey back to the surface, delaying the onset of Solar Cycle 24.


"The stage was set for the deepest solar minimum in a century," says co-author Petrus Martens of the Montana State University Department of Physics.


Colleagues and supporters of the team are calling the new model a significant advance.


"Understanding and predicting solar minimum is something we’ve never been able to do before---and it turns out to be very important," says Lika Guhathakurta of NASA’s Heliophysics Division in Washington, DC.  

Spotless Sun (blank sun, 200px)


Three years ago on March 2, 2008, the face of the sun was featureless--no sunspots. Credit: SOHO/MDI


While Solar Max is relatively brief, lasting a few years punctuated by episodes of violent flaring, over and done in days, Solar Minimum can grind on for many years. The famous Maunder Minimum of the 17th century lasted 70 years and coincided with the deepest part of Europe's Little Ice Age. Researchers are still struggling to understand the connection.


One thing is clear: During long minima, strange things happen. In 2008-2009, the sun’s global magnetic field weakened and the solar wind subsided.  Cosmic rays normally held at bay by the sun’s windy magnetism surged into the inner solar system.  During the deepest solar minimum in a century, ironically, space became a more dangerous place to travel.  At the same time, the heating action of UV rays normally provided by sunspots was absent, so Earth’s upper atmosphere began to cool and collapse.  Space junk stopped decaying as rapidly as usual and started accumulating in Earth orbit.  And so on….


Nandi notes that their new computer model explained not only the absence of sunspots but also the sun’s weakened magnetic field in 08-09.  "It's confirmation that we’re on the right track."


Next step:  NASA’s Solar Dynamics Observatory (SDO) can measure the motions of the sun’s conveyor belt—not just on the surface but deep inside, too. The technique is called helioseismology; it reveals the sun’s interior in much the same way that an ultrasound works on a pregnant woman.  By plugging SDO’s high-quality data into the computer model, the researchers might be able to predict how future solar minima will unfold.  SDO is just getting started, however, so forecasts will have to wait.


Indeed, much work remains to be done, but, says Guhathakurta, "finally, we may be cracking the mystery of the spotless sun."

Credits:  This research was funded by NASA’s Living With a Star Program and the Department of Science and Technology of the Government of India.

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Re: APOD

Post by Revs on Mon Mar 07 2011, 09:09

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Re: APOD

Post by Revs on Tue Mar 15 2011, 07:54

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Re: APOD

Post by Revs on Thu Jun 09 2011, 03:42

affraid
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Re: APOD

Post by Gelert on Thu Jun 09 2011, 20:13

Too many Hot Chillies syndrome.
I sympathise, Revs.

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Re: APOD

Post by Revs on Tue Jun 14 2011, 02:59

1hr...

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Re: APOD

Post by Revs on Sun Sep 04 2011, 06:38

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Re: APOD

Post by Revs on Tue Sep 27 2011, 07:00

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Re: APOD

Post by gueuzeman on Wed Sep 28 2011, 08:04

NICE!!
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Re: APOD

Post by Revs on Fri Dec 16 2011, 23:22


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Re: APOD

Post by da silva on Sat Dec 17 2011, 01:21

Interesting that it wouldn't be just vaporised getting that close to the sun.
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Re: APOD

Post by Revs on Thu Jan 05 2012, 04:34

this site is awesome...

i dont know if its more of a headfuck to zoom in or out from this page...

http://www.atlasoftheuniverse.com/localgr.html
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Re: APOD

Post by PLAYLIFE on Thu Jan 05 2012, 06:00

12.5 light years picture makes me wanna jump on my A500 and play Elite 2: Frontier!
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Re: APOD

Post by Revs on Fri Jan 20 2012, 06:19

this is big...

http://spaceweather.com/images2012/19jan12/ipad/ldm3.m4v?PHPSESSID=138bitpb2slt9uhc5jrnldep96

http://stereo.gsfc.nasa.gov/browse/2012/01/19/ahead_20120119_cor2_512.mpg
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Re: APOD

Post by PLAYLIFE on Mon Jan 23 2012, 05:00

Awesome Revs.

My brother just got a new telescope, was scoping out Jupiter last week. Great fun.
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Re: APOD

Post by Revs on Fri Jul 06 2012, 08:14

i got burnt today... in winter Sad

http://spaceweather.com/images2012/04jul12/20120704_034800_anim.tim-den.gif?PHPSESSID=h9j4o9m30fcairtmhut9favd57
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Re: APOD

Post by Revs on Tue Jul 10 2012, 11:32

this is a good one Smile

http://apod.nasa.gov/apod/ap120710.html
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Re: APOD

Post by Danny Boy on Wed Jul 11 2012, 04:15

He has been around for a while, not sure if I posted "Where the hell is Matt a few years ago" and I'm really not sure why Apod would post it?

about Matt
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Re: APOD

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