|
meteoptic-l [ät] ursa.fi
message archive
This is meteoptic-l [ät] ursa.fi message archive.
Note, your can reply the messages on this page only if your
are already subscribed the list.
» To the end of the list/message
Hello Jun,
> results. Are Meteoptic members aware of any more systematic
> surveys of frequency and the effects of season and latitude?
currently there are two halo observer groups active in the world, the
Finish team and our German halo group. The main goal of the German
network, which was founded in 1978 and has been including on average some
20
active observers at every time, is just what you described: We study the
occurance of all types of haloes, their relative frequencies, connection
to weather fronts and cloud types as well as seasonal/diurnal effects and
mutual dependencies between different halo types.
To make the analysis easier, a 'halo key' was introduced as a kind of
observational standard to ensure that all observers record all
relevant circumstances of their observation. This key is, as announced
earlier in Meteoptic, available via anonymous ftp from
ftp.tu-chemnitz.de, directory /pub/Local/msdos/astro/halo.
Starting from 1986, all observations have been feed to a computer. Now
they
can be analysed with our 'Halo' software. Currently, the database
contains more that 35.000 single observations. From here you can easily
obtain the numbers you are looking for, i.e. relative halo type
frequencies and other statistical measurements. Of course, most of our
haloes are observed at ~50 deg N from Germany.
Just mail me if you would like to know more about the German SHB
("Sektion Halobeobachtung" = halo observation section) or if you want to
take part in our programme.
Regards, Sirko Molau
|