No activity in last 7 days
Spectrohelioscope is telescope and spectroscope combined together in straight line, can folded up in U-shape.Heliostat(Newtonian diagonal) or two mirror coelostat reflects sun light into system.Solar image synthesizer is in middle,it wipes 24 solar images per second inside the eye at safe brightness level. Narrow passbands 0.05A for metals (Fe I, Mg I), 0.15A for He I yellow helium,0.2A Na I (D 2),0.6A for H alpha, 0.4A for H beta, just vary width of slits and tilt the grating.Wood tools, nuts and bolts, metal pieces,common sence. Costs about $600,including Edmund holographic grating of $150, 30 x 30mm area of 1800 gr/mm or 2400 gr/mm. Portable, compact for a car. See Sky and Telescope, January 1969. Laser optics,1/10 wave both sides,available, about $100 per plano-convex lens. Lens for telescope 50/1000mm f.l. used with -250mm Barlow 2X give 2000mm e.f.l., 19mm sun image.Lens for the spectroscope 50/1000mm f.l. Eyepieces simple single lenses 25mm diameter, 50 to 60mm f.l. for spec-mode and 110 to 130mm f.l. for SHS-mode.Visual spectrum has 4000 lines, one meter long spectrum.See H alpha and yellow He in emission with slit on solar limb. Yellow He in dark absorption in bright plage on solar disk by image subtraction and digicam.Zeeman effect in spot umbra. Also flares and Doppler effect for surges and proms.Put digital camera in line with 40mm f.l. Hastings eyepiece at exit slit and get instant spectrograms. With a moving synthesizer get spectroheliograms. Set digital camera on infinity focus, open lens wide, set on time.Few seconds wipe H alpha solar disk inside the camera for shgram.New shs web site for 2007 < >.Questar Corp for all solar wavelengths violet to red.Meudon solar observatory,Paris, solar atlas spectrograms of low and high resolution. Kitt Peak Observatory for photospheric profile atlas of solar spectrum.I have free 119 page book on SHS. New first article Zeeman effect by SHS, Journal British Astro Association, Feb 2006.
- Aug 16, 2000
- This is a restricted group.
- Attachments are permitted.
- Members cannot hide email address.
- Listed in Yahoo Groups directory.
- Membership requires approval.
- Messages are not moderated.
- All members can post messages.