Zilele trecute, când gerul a dispărut brusc după două săptămâni cât a fost dus la extrem, undeva în sud-vestul țării, pe cer s-a văzut un halou senzațional, format pe marginile unor nori de tip cirus.
Halourile de acest tip sunt produse, potriivt Wikipedia, de cristalele de gheata din nori cirus mari (5-10 km, sau 3-6 mile) în troposfera superioara. Forma speciala și orientarea cristalelor este responsabila pentru tipul de halo observat. Lumina este reflectata și refractata de cristale de gheata și poate imparti în culori, din cauza dispersiei. Cristalele se comporta ca prisme și oglinzi refractare și reflectand lumina soarelui intre fetele lor, trimitand arbori de lumina în directii speciale.
Aspectul acesta de curcubeu este senzațional și durează mult mai mult decât clasicul curcubeu.
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Politic
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