Halo around the sun 04.06.23 h13,15, page 2

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Varie ed Eventuali View gallery (18 photos)

Halo around the sun 04.06.23 h13,15 sent on June 05, 2023 (12:18) by Rodema. 41 comments, 694 views.

hand held.

Un alone di 22° è un tipo particolare di alone (fenomeno ottico) che forma un cerchio di 22° attorno al Sole o, più raramente, attorno alla Luna. Si forma quando la luce solare è rifratta da milioni di cristalli di ghiaccio esagonali sospesi nell'atmosfera e orientati in tutte le direzioni. Il raggio corrisponde all'incirca alle dimensioni di una mano aperta alla distanza del braccio teso. Gli aloni di 22° si formano quando il cielo contiene milioni di cristalli di ghiaccio disposti con un orientamento casuale. Alcuni di essi risultano allineati perpendicolarmente alla luce solare vista da uno specifico osservatore e questa luce produce nel cielo il cerchio illuminato di 22°; altri cristalli producono lo stesso fenomeno visto da altri osservatori. Quando un raggio di luce passa attraverso l'angolo di 60° di un cristallo di ghiaccio prismatico esagonale, la luce viene deflessa due volte, generando angoli di deflessione che vanno da 22° a 50°. L'angolo di deviazione minima è di quasi 22° (più precisamente 21,84° in media; con 21,54° per il rosso e 22,37° per il blu). Questa variazione nella rifrazione, che è funzione della lunghezza d'onda, provoca una colorazione rossastra nella parte interna del cerchio e bluastra in quella esterna. Poiché per angoli sotto i 22° la luce non viene rifratta, il cielo è più scuro all'interno dell'alone. Un alone (dal latino hal?s "cerchio intorno al Sole", a sua volta dal greco ???? hál?s[1]) chiamato anche arco di ghiaccio, nimbo o aureola è un anello di luce che circonda un astro. Gli aloni sono fenomeni ottici che appaiono vicini o attorno al Sole o alla Luna e a volte attorno ad altre forti sorgenti luminose come le luci stradali; l'alone stesso è di colore bianco intenso, con una sfumatura rossastra all'interno e violetta all'esterno; l'area di cielo interna all'alone è generalmente più scura di quella esterna. Gli aloni sono per la maggior parte causati da cristalli di ghiaccio nei freddi cirri ad altitudini di 5–10 km nella parte superiore della troposfera. La luce viene riflessa e rifratta dai cristalli di ghiaccio e potrebbe dividersi nei colori di base a causa della dispersione ottica, similmente agli arcobaleni. I due tipi fondamentali sono l'alone di 22° e l'alone di 46°. I vari tipi di alone sono dovuti alla forma particolare e all'orientamento dei cristalli di ghiaccio costituenti la nube. Quello dell'alone è un fenomeno simile all'arcobaleno eccetto per il fatto che viene formato dalla rifrazione della luce solare attraverso i cristalli di ghiaccio sospesi nelle nuvole al posto delle gocce di pioggia o ad altra acqua liquida sospesa nel cielo. Generalmente appaiono come sezioni di arco in confronto a cerchi completi. Le sezioni più luminose solitamente appaiono sopra, sotto e lateralmente al Sole. Gli aloni di ghiaccio provocati da cristalli di ghiaccio molto piccoli sono di un solo colore, poiché la diffrazione mescola assieme i colori. Fonte Wikipedia.

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Rodema

sent on June 09, 2023 (14:06) | This comment has been automatically translated (show/hide original)

@ Gios
@ Ignazio@
Loris @
Fabio@
Claudio@
Paolo
@ Maurizio
... I was really pleased to receive your appreciation and your interest in the phenomenon represented and described in the caption (all of course on Wikipedia source), thank you very much!
Best regards, Rod ;-)

Rodema

sent on June 09, 2023 (14:15) | This comment has been automatically translated (show/hide original)

A special thanks to Loris for having interested Fabio and of course a super thanks to Fabio for describing the phenomenon in detail.
Best regards, Rod ;-)

Werner

sent on June 10, 2023 (14:15) | This comment has been translated

Super!

Oleg Tsapko

sent on June 10, 2023 (15:19) | This comment has been automatically translated (show/hide original)

Super!!!!
Have a nice weekend!
Oleg.

Fabrizio Federici

sent on June 10, 2023 (19:48) | This comment has been automatically translated (show/hide original)

.... Wikipedia teaches!!!!!! very, very interesting
Congratulations Rod
Hello
Fabrizio

Rodema

sent on June 14, 2023 (8:03) | This comment has been automatically translated (show/hide original)

@ Werner@
Oleg
@ Fabrizio
... I read with great pleasure your very welcome comments, thank you very much!
Best regards, Rod ;-)

Pinitti

sent on June 14, 2023 (23:10) | This comment has been automatically translated (show/hide original)

A phenomenon of which I did not know that you have well proposed is explained, a bravo to you and, if you allow me, also to Fabio for his further explanation, all very interesting, hello.

Maryas

sent on June 18, 2023 (1:06) | This comment has been automatically translated (show/hide original)

Very nice and well made image, excellent and interesting caption.
Many compliments Rod, a warm greeting,
Mary

Renni

sent on July 10, 2023 (15:09) | This comment has been automatically translated (show/hide original)

.. I thought it was my sight... ;-)
Excellent and satisfying scientific curiosity. Not many (including me) would delve into this phenomenon of refraction.
Great job Rod. Congratulations!!
A warm greeting
PS .. and thanks to our mathematician Fabio ;-)

Fabio Ponso

sent on July 16, 2023 (12:13) | This comment has been automatically translated (show/hide original)

I take advantage of this beautiful and interesting photo of yours in the sun (and its halo), an inexhaustible source of light, to wish you well. Happy birthday Rod.
hello
Fabio

Rodema

sent on July 16, 2023 (15:29) | This comment has been automatically translated (show/hide original)

@ Pinitti@
Mary@
Renni
@ Fabio, thank you very much for the good wishes :-P
... I was really pleased to receive your appreciation, thank you very much!
Best regards, Rod ;-)

Renni

sent on July 16, 2023 (15:37) | This comment has been automatically translated (show/hide original)

.... And happy birthday Rod ;-)

Simobati

sent on July 16, 2023 (16:17) | This comment has been automatically translated (show/hide original)

Good in grasping and making known this phenomenon
Happy
birthday Greetings
Simone ;-)

Rinaldo1005

sent on July 16, 2023 (19:34) | This comment has been automatically translated (show/hide original)

Very interesting. Happy birthday Rod! :-P

Rodema

sent on July 17, 2023 (0:46) | This comment has been automatically translated (show/hide original)

@ Renni@
Simone
@ Rinaldo
... I was really pleased to receive your appreciation and your birthday wishes, thank you very much!
Best regards, Rod ;-)

Giordano Giacomo

sent on July 20, 2023 (8:49) | This comment has been automatically translated (show/hide original)

I like to focus more on the emotional aspect.
In front of these spectacular and rare natural events today we still feel amazement and wonder (at least the most curious and sensitive people ...), but we know that there is a scientific explanation (even if not clear to everyone).
Instead, I try to imagine what moods they must have stimulated, in addition to amazement, in the ancient people. Fear? Anxiety? Mysticism?
Anyway it's a great sight.
Greetings
GG

Jancuia

sent on August 09, 2023 (15:36) | This comment has been automatically translated (show/hide original)

Great idea and story.
Hello Rod

Rosario Cafiso

sent on September 25, 2023 (23:06) | This comment has been automatically translated (show/hide original)

Shooting and caption very interesting ;-) nice Rod

Alessandro Morini

sent on September 30, 2023 (19:38) | This comment has been automatically translated (show/hide original)

Amazed I look at this halo while reading a very exhaustive caption.
Congratulations to you Rod

Andreasettimoquarto

sent on October 02, 2023 (21:29) | This comment has been automatically translated (show/hide original)

Interesting caption and shot .. Greetings..
Andrea :-P

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