Could you explain this phenomenon?
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I can’t tell what it is, but I don’t think is a fallstreak hole. In a fallstreak hole, the ice crystals that form tend to precipitate and evaporate, so upper part is thicker and the lower part is fading away, like in a virga. Here it seems that the falling stuff coalesces in one long thick cloud. Unless, it’s the other way around, where the “ribs” are actually going down, but to me their curvature indicates that they are going away and up.
Jean-Pierre, do you have other shots of this phenom, either other angles or how it evolved in time, before and after?
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Looks like a distrail though ‘fallstreak hole’ is another reasonable name for it although it is a special version of one. The following link supplies a good explanation and some more photos.
http://www.weatherscapes.com/album.php?cat=clouds&subcat=distrailsAlthough distrails usually occur in supercooled cloud, I once saw one in thin stratocumulus which didn’t contain supercooled cloud droplets. The turbulence of the aircraft had created downflow in the middle of the wake and thus evaporation of the descending cloud. Alongside this gap, the rising air had thickened the cloud. The layer of cloud continued to thin until there was only the two narrow bands of thickened cloud along the edge of the aircraft track, thus leaving a pseudo-contrail at a height of about 4,000ft.
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