2006. november 6., hétfő

Diamond dust from Riihivuori snow guns

Towards the last weekend tension was rising among Finnish halo observers. It was going to be clear skies with sinking temperatures and full moon. Most of the ski centers had their snow guns running, so anticipation for diamond dust was high.

On Saturday, 4 November, Arto Oksanen drove to check the sitation at Riihivuori ski center. There was indeed a column crystal dominated display with upper sunvex Parry, as shown in the photo on the left.

Next night Arto did not have to go anywhere, since wind carried the ice clouds straight to his doorsteps, to Muurame town. It was Parry-time again, and now in addition to normal upper suncave there was also the much less commonly seen lower sunvex Parry (photo on the right). Untill the last winter the latter has been considered as an extreme rarity, but now reports have increased, thanks mainly to ski centers' snow guns and active observers around them. The display contained also other halos of interest, like Wegener anthelic arc and anthelion. See also Juha Oksa photos from Muurame the same night.

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