(meteorobs) Long path meteor -spiraling- *Magnified*

[Count Deiro]

Hi Eric and All,

The physics involved in the atmospheric entry of objects at hypervelocities in nearly all occurances results in the stabilization of the entrant. Space doesn't allow the dissertation here, but the induced drag, plasma ablation, aerodynamics and additional thermodynamics, all play a part in fixing the attitude of the object quite soon after encountering the troposphere and the mesosphere where, incidentally, meteorites "burn" up.

Best Holiday Wishes to all,

Count Deiro
IMCA 3536 MetSoc




-----Original Message-----
>From: eric at meteoritesusa.com
>Sent: Dec 5, 2011 10:30 AM
>To: meteorobs at meteorobs.org
>Subject: Re: (meteorobs) Long path meteor -spiraling-  *Magnified*
>
>Just curious...
>
>Almost all of the videos/movies claiming spiraling meteoroids have  
>been "explained away" as either equipment malfunction (shaking) and/or  
>software issues, and even operator error.
>
>Is there some bias against spiraling meteoroids or something? Why it's  
>so hard for people to believe that spiraling/tumbling meteoroids happen?
>
>Regards,
>Eric
>
>
>
>Quoting Thomas Ashcraft <ashcraft at heliotown.com>:
>
>> Follow-up to the post regarding possible rotation visible of the meteor
>> when magnified:
>>
>> It was suggested off-list that the apparent rotation was due to
>> interlacing and software processing artifacts.  As a test, I processed
>> and magnified a video of a similar meteor from my archives and I now
>> think the "rotation" is indeed a product of the software processing as
>> it also shows rotation.  Here is a quick test movie and I did not add
>> text or labels:
>> http://www.heliotown.com/Meteorrotationtest_Ashcraft.mp4
>>
>> Thomas in New Mexico
>>
>>
>> On 12/1/11 7:41 PM, Thomas Ashcraft wrote:
>>>> UPDATE:
>>>>
>>>> On 12/1/11 8:23 AM, Thomas Ashcraft wrote:
>>>>> Dec 01, 2011  2:35:54 am MST.
>>>>>
>>>>> There was a very long path meteor over north-central New Mexico last
>>>>> night.  Visible flight time lasted ~ 13 seconds.
>>>>>
>>>>> All-sky camera view with stereo forward scatter:   Movie.  1 MB  .mp4
>>>>> format.
>>>>>
>>>>> http://www.heliotown.com/FBs20111201_093554ut_Ashcraft.mp4
>>>>>
>>>> Update to previous post:
>>>>
>>>> For further analysis I magnified this meteor in Final Cut Express (movie
>>>> making software for Macs) and slowed it down and it is interesting to
>>>> see this particular meteor clearly spiraling.
>>>>
>>>> Here is a longer movie that includes the magnification.  4 MB  .mp4 format
>>>> http://www.heliotown.com/FBmagDec012011_093554ut_Ashcraft.mp4
>>>>
>>>> Thomas Ashcraft near Santa Fe
>>> Further update:
>>>
>>> Someone suggested that the apparent spiraling of the meteor may be
>>> interlacing artifacts and could also be frame grabber artifacts.
>>>
>>> Any further analysis is welcome. Thank you.
>>>
>>> Thomas in New Mexico
>>>
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