(meteorobs) Radio Orionids

[stange34 at sbcglobal.net]

Got it Ed.

I was very impressed with a spectral image Peter Jenniskens took of a meteor 
with his intensified system. I was hoping yours would be similar. 
Unfortunately a near melt-down of this online computer lost that photo 
record.

Larry


----- Original Message ----- 
From: "Ed Majden" <epmajden at shaw.ca>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2007/10/21 13:01
Subject: Re: (meteorobs) Radio Orionids


>
> On 21-Oct-07, at 11:10 AM, stange34 at sbcglobal.net wrote:
>
>> Ed, Will your new(?) spectrograph images be a different type from the
>> images
>> of before?..... Similar to a meteor streak with spectra-radiation bands
>> parallel to the travel path?
>>
> Larry:
> I'm not sure I understand your question.  All meteor spectra are
> similar, with emission lines for the elements present in the meteoroid
> with an atmospheric component.  There can also be a continuum
> radiation present sometimes made up of unresolved lines in the
> spectrum.  This continuum radiation is as yet not fully understood.  I
> suggest you download the IMO Photographic Handbook, Chapter 3 on meteor
> spectroscopy which should give you a better understanding of this work.
> As for my new spectrograph, I just took delivery of a surplus image
> intensifier.  It's Philips XX1332 Photonis night vision intensifier.
> It has a 50 mm input screen with a 40 mm output screen.  My old
> intensifier has a 25 mm screen so the larger XX1332 will allow me to
> get a wider field of view or better dispersion depending of the lens
> and grating combination selected.  I will use either an f/2.8 - 75mm
> f.l.  Bronica Zenzanon  lens or a Hasselblad f/2.8 - 80mm f.l.  Zeiss
> Planar lens fitted with a B&L 600g/mm blazed precision replica
> diffraction grating. Dr. Jiri Borovicka says he uses a very fast f/0.95
> - 50mm lens on a similar system but it suffers from off-axis distortion
> at the edge of the field of view.  My larger format lenses will be
> slower in speed but should not suffer as much from off-axis
> distortions.  I'm in the process of setting this up so it has not been
> posted to my web page.  Oh, I bought the surplus XX1332 intensifier
> from the UK which cost 245 GBP plus shipping and handling at 22.00 GBP.
> Ed
>
>
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