Post by olaf3sky on Aug 29, 2014 16:10:38 GMT
NLC classification - new grade for brightness !?!
Hi folks!
Season 2014 has ended so far.
One thing I thought about since years is if we need a new classification system concerning the brightness.
Since years we know the automatic detections by different camera techniques and it is becoming more and more and easier to handle.
There are other points I like to show. More and more (experienced) observers detect NLC only by help of the camera display preview or NLC are only visible and discovered with the help of binoculars - and they are probably not visible with the naked eye - or one would never have seen them without the help of it.
Here www.ed-co.net/nlc/nlcobser.htm
or
here ed-co.net/nlcnet/observe#d
you find the historical (?) classification system and the actual used five-point scale concerning the brightness of NLC:
NLC brightness is measured on a five-point scale:
1 = Very weak NLC, which are barely visible against the twilight sky.
2 = NLC clearly detected, but having low brightness.
3 = NLC clearly visible, standing out sharply against the twilight sky.
4 = NLC very bright and attracting the attention of casual observers.
5 = NLC extremely bright and noticeably illuminating objects facing it.
Not to forget the code “0” for “no NLC” if we have clear sky conditions.
So, who could change this system “official”?
Or can we make a start here with the help of Tom’s international website?
My suggestion is as following example:
The simpliest thing could be to give only -one- new code which is used for observations for the examples mentioned above. So it stands for all the detected NLCs which could not be observed with the naked eye.
I would update the old scale with the code “9”.
As I know the “9” or “99” is used in the computerworld for example for unknown cases / if something can not be named or coded (I am not sure to describe this correct – but I hope operators will understand what I mean …).
Of course there are more possibilities for more codes (one for autonomous automatic camera detection (brightness is unknown) / one for detection only by binocular / one for detection only by camera with operator behind / and maybe some more?).
The cases show that observers would never have been seen some NLCs without the help of the mentioned operational technics above (me too). So they would classify the brightness rather as “0,0..” instead of “1” but “0” stands for “no NLC visible” - and not only for not visible but as we understand it says NLC does not exist at all at time of observation.
So - maybe only a few of observers will take note of this thread at this late date of the season.
Nevertheless I try to start a poll so we can discuss again before next season.
Or Tom has a solution right now ? ;-)
Will try to start the discussion on the German forum.meteoros.de/ , too.
Kind regards,
Olaf
Hi folks!
Season 2014 has ended so far.
One thing I thought about since years is if we need a new classification system concerning the brightness.
Since years we know the automatic detections by different camera techniques and it is becoming more and more and easier to handle.
There are other points I like to show. More and more (experienced) observers detect NLC only by help of the camera display preview or NLC are only visible and discovered with the help of binoculars - and they are probably not visible with the naked eye - or one would never have seen them without the help of it.
Here www.ed-co.net/nlc/nlcobser.htm
or
here ed-co.net/nlcnet/observe#d
you find the historical (?) classification system and the actual used five-point scale concerning the brightness of NLC:
NLC brightness is measured on a five-point scale:
1 = Very weak NLC, which are barely visible against the twilight sky.
2 = NLC clearly detected, but having low brightness.
3 = NLC clearly visible, standing out sharply against the twilight sky.
4 = NLC very bright and attracting the attention of casual observers.
5 = NLC extremely bright and noticeably illuminating objects facing it.
Not to forget the code “0” for “no NLC” if we have clear sky conditions.
So, who could change this system “official”?
Or can we make a start here with the help of Tom’s international website?
My suggestion is as following example:
The simpliest thing could be to give only -one- new code which is used for observations for the examples mentioned above. So it stands for all the detected NLCs which could not be observed with the naked eye.
I would update the old scale with the code “9”.
As I know the “9” or “99” is used in the computerworld for example for unknown cases / if something can not be named or coded (I am not sure to describe this correct – but I hope operators will understand what I mean …).
Of course there are more possibilities for more codes (one for autonomous automatic camera detection (brightness is unknown) / one for detection only by binocular / one for detection only by camera with operator behind / and maybe some more?).
The cases show that observers would never have been seen some NLCs without the help of the mentioned operational technics above (me too). So they would classify the brightness rather as “0,0..” instead of “1” but “0” stands for “no NLC visible” - and not only for not visible but as we understand it says NLC does not exist at all at time of observation.
So - maybe only a few of observers will take note of this thread at this late date of the season.
Nevertheless I try to start a poll so we can discuss again before next season.
Or Tom has a solution right now ? ;-)
Will try to start the discussion on the German forum.meteoros.de/ , too.
Kind regards,
Olaf