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Solar spectrum (visual)
solar Spectrum (visual)
Recommended equipment: Lhires III, Lhires LiteTime: 1h
It works every time: anyone watching the solar spectra in hig resolution enjoy it -it is magical!
and it's easy: you just have to direct the Lhires III, without a telescope, directly toward the Sun. It is safe as the spectra is highly dispersed with the 2400lines/mm grating.
Solar spectrum (O. Garde) with a Lhires III
If the Sun is hiden behind clouds, you can then mount your Lhires III on a small refractor and point toward a cloud. you will see a less contrasted spectra but your astronomy day is not ruinned! And of course, you can put in front of your spectrograph several lamps to analyse their composition through their spectra!
In 1802, Wollaston noticed some dark lines in the solar spectra. Fraunhofer published in 1815 a list of those lines, which are now called the Fraunhofer lines. One can also see our atmospheric absorption lines which are more visible at sunset or sunrise.
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Solar spectrum during sunset (top) and mid-day (bottom)
During public observations, a Lhires III simply attached on a tripod will be a fantastic educational tool. It open the door to physic and the understanding of the message contained within the light coming from our Sun. Magical spectroscopy is in action!...
Lhires III used in stand alone mode
Références:
-http://bass2000.obspm.fr/home.php?lang=fr : BASS2000 is the reference site on solar observation; tons of data and informations are available there.
-http://bass2000.obspm.fr/solar_spect.php : interactive spectrum
-http://bass2000.obspm.fr/download/solar_spect.pdf : commented profile spectra (high resolution)
-http://ljr.bagn.obs-mip.fr/observing/spectrum/index.html : a serie of pictures of the solar spectrum with element marked on. A very useful document for studying the solar spectrum in details.
-http://solaire.obspm.fr/ : solar observer website (french) with lot of references and posters available there. Some are easy to understand for international readers...
-http://fermi.jhuapl.edu/liege/s00_0000.html : Liege observatory solar spectrum atlas
-http://thizy.free.fr/shelyak/LhiresLite/PL0019A%20spectre-solaire%20Lhires%20Lite%20FR-EN.pdf : educational page done by Olivier Garde with his Lhires III (same resolution as Lhires Lite). Can be printed and distributed during your public outreach activites!
-http://www.shelyak.com/fr/Soleil300.jpg: spectre du Soleil commenté en basse résolution