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Alex Gaina

13 Oct 2008 16:00


HALO

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In orice caz nu 41.7 grade, ca in cazul curcubeului (Rainbow, or Bow). Daca nu gresesc era aproximativ de o schioapa in jurul soarelui. Schiapa mea (masurata la mana intinsa) are 28 grade. 
Ceea ce este clar: Norii erau de tip Cirus, care se gasec la inaltimile ceva mai mari de 6 km. De obicei norii cei mai inalti nu depasec 18 km 6-7 km. Sunt formati din cristale de ghiata, care formeaza efectul de forward Glory scattering (sau difuzie aurora inainte). Mentionez, ca exista si backward glory scattering (sau difuzue aurora inapoi).

Pentru cazul dat avem:

Hnor/D= (6-18 km)/1.5x10^8km= (0.825-2.476)x10^-2 " sau a suta parte dintr-o secunda de arc. Ar corespunde cazului forward glory scattering.
In orice caz, nu gasesc o alta explicatie.

Bibliografie:
1. Merill, Focus on Earth Science, pp. 163-167.  Copyright 1987, Merrill Publ. C.  

ENGLISH
Since the height of the Cirus clouds is obviously 6-7 km, the observed glory corresponds to an angle of

Hclouds/D= (6-18 km)/1.5x10^8km= (0.825-2.476)x10^-2 " or about 0.01 parts of an arcsecond, which probably reffers to forward glory scattering of light rays, emmerging from the Sun,  on ice droplets. 
It is important to mention that the rainbow scattering corresponds to an angle about 42 degrees. 

Bibliography:
1. Merill, Focus on Earth Science, pp. 163-167. Copyright 1987, Merrill Publ. C.