Tuesday, February 22, 2005

Blue violet solar spectrum

I read somewhere most of the lines in the blue and violet were due to the gazillion transitions that iron's electrons have.

Click on the above image for a larger version.

Interestingly, in the camera there is more spectral detail in the red channel than the blue. (This is probably related to the fact that most dye filters will transmit light not only of the design wavelength but also double the wavelength--so a blue filter with a peak wavelength of 450nm will also transmit around 900nm.) Edit: While this effect occurs, it wouldn't appear in this instance. It should appear in the near infrared spectrum. After looking at the histogram it is clear the blue channel is totally saturated (aka overexposed). I bet the camera chooses the exposure mostly on what the green channel is seeing.

This is another project: I have the entire solar spectrum from slightly UV-ward of the calcium H & K lines at 400nm to somewhere near 750-800nm in the near-infrared imaged through my spectrograph and the Ryerson telescope. I want to combine the images into a long continuous image. My own solar spectrum.

Also see

The Solar Spectrum -- Magnesium Triplet

Terrestrial Oxygen Red

The Sodium Doublet


dina said...

i don't know how i came here...but i found this picture and i really love it!

if you want, you can find me here: www.fotolog.net/eilatit

thanks for this beauty =)


[ sorry for my bad english, i'm from Argentina]

Dragonseeker Atlast said...

The Blue Violet solar spectrum was amazing!

I copied it and I use it for my screen cover.

This is amazing! I really liked the Pluto animation too.

You can find me at


13dragon said...


I won't pretend to understand the science that you're talking about, as I completely flunked the last Physics lessons I had (about 5 years ago), but i was wondering if it'd be ok if I could use the pictures you've come up with in a background or two that I'm thinking of making. I'll credit you and your blog in my resources post if you're worried I'll try and claim these as my own.


Dean W. Armstrong said...

Sure--you can use it for noncommercial work, just give me a link back. I'm always interested to see what people do.