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Iron meteors

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BillW's picture
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Iron meteors

Hi,

Was looking through material from earlier in the year and I found some stuff I meant to post a while back. Using my "Narrow field Of View EXperiment" (NOVEX) and the spectro systems I'd recorded some meteors that stood out by way of their unusual light curves.

They appeared right at maximum brightness and then faded. Some further reading revealed this to be considered a  characteristic of Ni/Fe meteors.

Rather counter intuitively this meteor is travelling bottom to top...

and this one is top to bottom.

The spectra were rather faint but recoverable, thus:

and

They have different dispersions due to being caught on 830 lines/mm and 600 lines/mm gratings' respectively.

Even though I've demonstrated the idea previously it still tickles me when the spectrum "fit" of the various meteors is so good.

So, looks these were made of the same stuff!

The colourised versions look pretty good too.. (should've maybe trimmed them so they align, next time ... ;-))

A nice result and new view on this type of meteor.

cheers,

Bill.

BillW's picture
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Forgot to include the actual

Forgot to include the actual light curves..!

These are simple sections taken along the meteor trails using IRIS.

The onset of light emission is dramatic, especially in the first one.

Cheers,

Bill.

BillW's picture
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Had a very good nights

Had a very good nights observing on the 5/6 October. Caught some more meteors with very rapid onsets, perhaps more Fe meteors. Unfortunately didn't get any spectra of these. However did pick up a few other equally interesting ones. The best had very bright oxygen emission coming from several lines.

Video is here https://youtu.be/EqVVNOun3YI

cheers,

Bill.

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Nice work Bill. I saw your

Nice work Bill. I saw your YouTube clip before seeing this post and was wondering what NOVEX meant. :-)

If Ni/Fe meteors suddenly appear at maximum brightness and then fade off, can we deduce anything beyond a low Ni/Fe content for meteors displaying the opposite of that?