Wonder what the black body radiation is at that temp ?Shrike wrote:about 5000 Celsiusfosborn_ wrote:by GaryN » Mon Jul 11, 2011 1:12 pm
Our Boring, Black Sun.
Until I see proof otherwise, I believe ourSun would be blackif we tried to view
it from outside Earths atmosphere.
How hot is the surface of the Sun ?
The Boring Sun
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Re: The Boring Sun
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
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Re: The Boring Sun
So if I heated a piece of calcium to that temp, wonder what the luminosity would be?Shrike wrote:about 5000 Celsiusfosborn_ wrote:by GaryN » Mon Jul 11, 2011 1:12 pm
Our Boring, Black Sun.
Until I see proof otherwise, I believe ourSun would be blackif we tried to view
it from outside Earths atmosphere.
How hot is the surface of the Sun ?
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
- GaryN
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- Location: Sooke, BC, Canada
Re: The Boring Sun
Is this a trick question Frank?
I read between 4500 and 6000, one method of measurement gives 5840. I'm
just looking into how the temperature is measured, and where from. Here
is a pdf about the method of temperature measurement in a selection of
young main sequence stars.
http://schwab.tsuniv.edu/papers/paspc/cs13/reprint2.pdf
I see room for error in these methods though, but I need to learn more
about the absorption lines and how they can be affected.
get hot to the touch. Maybe the photosphere is only warm?
I read between 4500 and 6000, one method of measurement gives 5840. I'm
just looking into how the temperature is measured, and where from. Here
is a pdf about the method of temperature measurement in a selection of
young main sequence stars.
http://schwab.tsuniv.edu/papers/paspc/cs13/reprint2.pdf
I see room for error in these methods though, but I need to learn more
about the absorption lines and how they can be affected.
Well what about my 6000 K full spectrum fluorescent lamp? It doesn't evenSo if I heated a piece of calcium to that temp, wonder what the luminosity would be?
get hot to the touch. Maybe the photosphere is only warm?
In order to change an existing paradigm you do not struggle to try and change the problematic model. You create a new model and make the old one obsolete. -Buckminster Fuller
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Re: The Boring Sun
http://chamorrobible.org/images/photos/ ... medium.jpg
space...
http://cache.gawkerassets.com/assets/im ... nflare.jpg
earth...
http://gizmodo.com/5562538/shooting-cha ... y-part-one
Heliophobia has two meanings:
* in psychology, heliophobia refers to a morbid fear of sunlight.
* in medicine, heliophobia (more commonly photophobia) refers to an excessive sensitivity to sunlight.
Today is the yesterday of tomorrow.
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Re: The Boring Sun
Just trying to achieve entry level conversation.GaryN wrote:Is this a trick question Frank?
What is the source of all that radiant energy that heats the earth?GaryN wrote: Well what about my 6000 K full spectrum fluorescent lamp? It doesn't even
get hot to the touch.Maybe the photosphere is only warm?
If I face the Sun, its warm. If I look away, its cooler.
When I'm in Colorado at 9400 feet, it feels even hotter in the sun.
The closer I get, the hotter it gets, is my current conclusion, at this point in my investigations.
Sorry, I don't have a link to an abstract for it.
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
- GaryN
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- Joined: Tue Apr 01, 2008 8:18 pm
- Location: Sooke, BC, Canada
Re: The Boring Sun
http://chamorrobible.org/images/photos/ ... medium.jpg
Nice image, but it does raise a few questions. Looking directly at the Sun, with no
filter, no atmosphere to cut out the UV, and yet the camera is not blinded, as it
shows the back side of the arm in full detail. I'd have thought it would be black.
I wonder if the camera was ruined after that shot?
No lens flares with a solar filter, just wish I could get NASA to have one
of the EVA crew put a filter on their camera and show me the Sun. All these
years of manned space flight, and they forgot to take a solar filter with them?
Spectrum tubes use a high voltage (1000-5000V) to make the elements glow, so is the
photosphere, only 100km deep, a charged shell? Or what about microwaves and magnetically
induced plasmas? Lots of ways to produce glows, which one does the Sun use?
Nice image, but it does raise a few questions. Looking directly at the Sun, with no
filter, no atmosphere to cut out the UV, and yet the camera is not blinded, as it
shows the back side of the arm in full detail. I'd have thought it would be black.
I wonder if the camera was ruined after that shot?
Through a solar filter the Sun appears in its “real ”colour —neutral white, not blue or orange, and the sky adjacent to the solar limb is jet black.
No lens flares with a solar filter, just wish I could get NASA to have one
of the EVA crew put a filter on their camera and show me the Sun. All these
years of manned space flight, and they forgot to take a solar filter with them?
Infrared for the most part, I believe.What is the source of all that radiant energy that heats the earth?
Spectrum tubes use a high voltage (1000-5000V) to make the elements glow, so is the
photosphere, only 100km deep, a charged shell? Or what about microwaves and magnetically
induced plasmas? Lots of ways to produce glows, which one does the Sun use?
In order to change an existing paradigm you do not struggle to try and change the problematic model. You create a new model and make the old one obsolete. -Buckminster Fuller
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Re: The Boring Sun
The Solar Radiation and Climate Experiment (SORCE) is a NASA-sponsored satellite mission that provides state-of-the-art measurements of incoming X-ray, ultraviolet, near-infrared, and total solar radiation. The measurements provided by SORCE specifically address long-term climate change, natural variability and enhanced climate prediction, and atmospheric ozone and UV-B radiation. These measurements are critical to studies of the Sun; its effect on our Earth system; and its influence on humankind.
Semi-major axis 7002.26 km
http://en.wikipedia.org/wiki/Sunlight#T ... upon_Earthbut most recently NASA cites TSI as "1361 W/m2 as compared to ~1366 W/m2 from earlier observations [Kopp et al., 2005]", based on regular readings from NASA's Solar Radiation and Climate Experiment(SORCE) satellite, active since 2003,[5] noting that this "discovery is critical in examining the energy budget of the planet Earth
http://lasp.colorado.edu/sorce/instrume ... #sim_block
Looks like there is equipment to measure the Sun's total output. Its whole spectrum.
I think you can rest your mind about a dark sun.
http://lasp.colorado.edu/sorce/instruments/sim.htmSpectral Irradiance Monitor (SIM)
Introduction
The Spectral Irradiance Monitor is a newly designed spectrometer that provides the first long-duration solar spectral irradiance measurements in the visible and near infrared (Vis/NIR). The wavelength coverage is primarily from 300 to 2400 nm, with an additional channel to cover the 200-300 nm ultraviolet spectral region to overlap with the SOLSTICE, another instrument on-board the SORCE satellite. Understanding the wavelength-dependent variability throughout SIM's wavelength range is of primary importance for long-term climate change studies on Earth. SIM is a single optical element Fèry prism spectrometer; only one optical element is needed to focus and disperse the light onto a series of detectors in the spectrometer's focal plane. In this focal plane, four photodiode detectors and an electrical substitution radiometer (ESR) are used to detect solar radiation. SIM contains two completely independent and identical (mirror-image) spectrometers to provide redundancy and self-calibration capability.
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
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Re: The Boring Sun
No. The kelvin measurement of light is the temperature that an ideal black body would have to reach to emit that particular frequency of light as thermal radiation. Your fluorescent lamp emits light by non-thermal means, so it's very cool, whilst a regular filament lamp emitting 6000K light is an almost ideal black body emitting light as thermal radiation, so is very hot. The sun emits light as thermal radiation, which is how we stay warm. If it were emitting light by non-thermal means it would be invisible in infra red, and we'd be a very cold planet.GaryN wrote:Is this a trick question Frank?
I read between 4500 and 6000, one method of measurement gives 5840. I'm
just looking into how the temperature is measured, and where from. Here
is a pdf about the method of temperature measurement in a selection of
young main sequence stars.
http://schwab.tsuniv.edu/papers/paspc/cs13/reprint2.pdf
I see room for error in these methods though, but I need to learn more
about the absorption lines and how they can be affected.Well what about my 6000 K full spectrum fluorescent lamp? It doesn't evenSo if I heated a piece of calcium to that temp, wonder what the luminosity would be?
get hot to the touch. Maybe the photosphere is only warm?
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Re: The Boring Sun
http://www.youtube.com/watch?v=Zq0ptByQrcg
The sun looks fairly bright, in fact it completely overpowers the camera. One of the difficulty of taking pictures of the sun.
This was taken from the moon, the sun is not black.
The sun looks fairly bright, in fact it completely overpowers the camera. One of the difficulty of taking pictures of the sun.
This was taken from the moon, the sun is not black.
Today is the yesterday of tomorrow.
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Re: The Boring Sun
Good news for any would-be space tourists. After some correspondence with
astronomers and manufacturers of Solar filters, they are in 100% agreement
that you can take a picture of the Sun with an ordinary camera and a standard
Solar filter. Some cameras may require additional IR/UV blocking, depending
on the response characteristics of the camera. Why you would want to take a
picture of something you can see every day from your front yard (apart from in
the Pacific Northwest this year ) is the obvious question though.
Anyway, it seems that it is not the Sun that is boring, it is that the astronauts
see it blazing away every day, and have just become bored with it. Case closed.
astronomers and manufacturers of Solar filters, they are in 100% agreement
that you can take a picture of the Sun with an ordinary camera and a standard
Solar filter. Some cameras may require additional IR/UV blocking, depending
on the response characteristics of the camera. Why you would want to take a
picture of something you can see every day from your front yard (apart from in
the Pacific Northwest this year ) is the obvious question though.
Anyway, it seems that it is not the Sun that is boring, it is that the astronauts
see it blazing away every day, and have just become bored with it. Case closed.
In order to change an existing paradigm you do not struggle to try and change the problematic model. You create a new model and make the old one obsolete. -Buckminster Fuller
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- Joined: Tue May 17, 2011 10:20 am
- Location: Kansas
Re: The Boring Sun
Closed case?GaryN wrote:Good news for any would-be space tourists. After some correspondence with
astronomers and manufacturers of Solar filters, they are in 100% agreement
that you can take a picture of the Sun with an ordinary camera and a standard
Solar filter. Some cameras may require additional IR/UV blocking, depending
on the response characteristics of the camera. Why you would want to take a
picture of something you can see every day from your front yard (apart from in
the Pacific Northwest this year ) is the obvious question though.
Anyway, it seems that it is not the Sun that is boring, it is that the astronauts
see it blazing away every day, and have just become bored with it. Case closed.
Are you now saying that the science people presented in this thread to falsify your view of astronomy, is valid then?
Folks went to some effort you know.
http://thunderbolts.info/wp/forum/phpBB3/v ... =60#p52877
http://thunderbolts.info/wp/forum/phpBB3/v ... 434#p54278
http://thunderbolts.info/wp/forum/phpBB3/v ... 434#p54274
http://thunderbolts.info/wp/forum/phpBB3/v ... =15#p51998
http://thunderbolts.info/wp/forum/phpBB3/v ... =15#p52323
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
-
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- Joined: Tue Jul 28, 2009 7:56 am
Re: The Boring Sun
Maybe for the Sun. What about stars?GaryN wrote:Good news for any would-be space tourists. After some correspondence with
astronomers and manufacturers of Solar filters, they are in 100% agreement
that you can take a picture of the Sun with an ordinary camera and a standard
Solar filter. Some cameras may require additional IR/UV blocking, depending
on the response characteristics of the camera. Why you would want to take a
picture of something you can see every day from your front yard (apart from in
the Pacific Northwest this year ) is the obvious question though.
Anyway, it seems that it is not the Sun that is boring, it is that the astronauts
see it blazing away every day, and have just become bored with it. Case closed.
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- Joined: Tue May 17, 2011 10:20 am
- Location: Kansas
Re: The Boring Sun
fosborn_ wrote:Closed case?GaryN wrote:Good news for any would-be space tourists. After some correspondence with
astronomers and manufacturers of Solar filters, they are in 100% agreement
that you can take a picture of the Sun with an ordinary camera and a standard
Solar filter. Some cameras may require additional IR/UV blocking, depending
on the response characteristics of the camera. Why you would want to take a
picture of something you can see every day from your front yard (apart from in
the Pacific Northwest this year ) is the obvious question though.
Anyway, it seems that it is not the Sun that is boring, it is that the astronauts
see it blazing away every day, and have just become bored with it. Case closed.
Are you now saying that the science people presented in this thread to falsify your view of astronomy, is valid then?
Folks went to some effort you know.
http://thunderbolts.info/wp/forum/phpBB3/v ... =60#p52877
http://thunderbolts.info/wp/forum/phpBB3/v ... 434#p54278
http://thunderbolts.info/wp/forum/phpBB3/v ... 434#p54274
http://thunderbolts.info/wp/forum/phpBB3/v ... =15#p51998
http://thunderbolts.info/wp/forum/phpBB3/v ... =15#p52323
Read the links, its covered.Maybe for the Sun. What about stars?
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
- GaryN
- Posts: 2668
- Joined: Tue Apr 01, 2008 8:18 pm
- Location: Sooke, BC, Canada
Re: The Boring Sun
Faced with the consensus of experts on the Sun, solar filters, and cameras, IClosed case?
Are you now saying that the science people presented in this thread to falsify your view of astronomy, is valid then?
Folks went to some effort you know.
have to accept that the Sun can be photographed in space, and will look like
the Sun as seen through a filter, from Earth. The fact that no such image exists
is due to nobody, over 40 years of manned space flight, having had the time and/or
interest to take such an image. It's just the Sun, no big deal.
Same thing I guess. If the experts say you will obviously see a glorious view ofMaybe for the Sun. What about stars?
the heavens from space, then you will, and I'm sure the pioneering space tourists
will confirm this one day.
I think I may have been far too cynical of the abilities of the experts in their
various fields. I have to accept that I am not qualified to question their years
of University, their certificates and the absolute authority of those letters after
their names. My life will be much simpler and less frustrating if I just believe
what I am told. In a way this will be a major relief, especially with things like
black holes and magnetars, dark energy, etc. I have spent far too long worrying about
things best left to the experts. I have been assimilated into the scientific hive
mind, it feels good.
In order to change an existing paradigm you do not struggle to try and change the problematic model. You create a new model and make the old one obsolete. -Buckminster Fuller
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Re: The Boring Sun
What some cheese with that wine?GaryN wrote:Faced with the consensus of experts on the Sun, solar filters, and cameras, IClosed case?
Are you now saying that the science people presented in this thread to falsify your view of astronomy, is valid then?
Folks went to some effort you know.
have to accept that the Sun can be photographed in space, and will look like
the Sun as seen through a filter, from Earth. The fact that no such image exists
is due to nobody, over 40 years of manned space flight, having had the time and/or
interest to take such an image. It's just the Sun, no big deal.
would the darkest Voyager methane filter work okay for you?
Its the one they used to take pictures of the sun.
The most exciting phrase to hear in science,
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
the one that heralds new discoveries,
is not 'Eureka!' but 'That's funny...'
Isaac Asimov
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