Periodo infelice questo per gli spotters di aerei in volo ad alta quota. Cielo quasi sempre coperto e poche occasioni di osservare e fotografare aerei con scia.
La mattina di martedì 2 febbraio tuttavia il cielo di Milano, libero da nuvole, ha offerto un discreto spettacolo. E' stato infatti possibile osservare quelle particolari e affascinanti scie di condensazione ( contrails o Kondensstreifen ) che durano qualche minuto e che svaniscono dissipandosi in onde e anelli. Queste scie, in accordo con quanto riportato da K. Gierens (1) si formano quando l'aria non è ancora sovrasatura rispetto al ghiaccio (condizioni per la persistenza delle scie) ma è meno sottosatura rispetto a quando le scie persistono per pochi secondi.
Vediamo dunque qualche foto della mattinata February 2, and analysis of weather data.
Vediamo dunque qualche foto della mattinata February 2, and analysis of weather data.
meets trails. Comparison of a newly formed trail and a trail in sublimation. Which of the two trails is closer? :)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjapL0P1iLMP8SRWxGOA8rGnZCYY5OdY7B-xL5nJxpZAPbAShxDnO1L3pgthKGN1Lh5QFZtT3quoTy09Sc7WaAzulbjVBt4q5hITK_aZzO6TtFaCVOXJ7JkCLzXQtVpXDVqecOAHaHhlOg/s400/2210+(2).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtSjuxyVoCNBLLYA7KEzwhtWf0zngAvaoZOGLS6ttxm10_oCdLmvtXBObjPMH8RwJDOzCSTPvsYqaAIFDg2fS9P4ELBcOfpC1oS_toRzJWl6Cf7RtdhQ2wDWNIAZRg5qBmon8VYZ1MjDM/s400/2210+(5).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6xkzHLuqQBq0HrIFld2lFIC4RJi0Nt9SYvc4HHR5ENItXLv6wsQ2dhabikPnmra42vNXP4XSvnjT0zN7469LYMN2t2RvZy9zmTbX8DV3Gw_Mq97uWrF3ZCC50Brr191CnIA4OWhGYHg0/s400/2210+(10).jpg)
Contrail up close. Close encounter with a wake in sublimation. The rings disappear and the trail disappears.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgseuDmVkO_Bb45SpMonDFMlzumKvMRPMazXKQbsuhaQKDNhedKLCNnDCpicrTxIcp8_azTuBrKTR2nbfyVLUfCtvh77_c_L3KY_K_d3KSiBy2nkgqG9xo3qjazpHKLsq8ZLglY7sdq8Ls/s400/2210+(8).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKTYZBtQH9rMDBFValAoVU8CKqLXfAWhpVRAGX95tezJA1M9WgbkN4M8GdgUSMTMCVervVSGI6QyhbNYJvgNWRDWbo7aXQzeSH_yf-HkbOwzF7wU8Kfx1tPScGNhI5W2NDmWj77VN55wQ/s400/2210+(1).jpg)
The flight dell'A321. A Lufthansa Airbus A321 meets two trails in sublimation.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6QTGBPFaendrEtAY_exMfLzKviJcI-4kp6GL0qdeSV7IcQ-Ft7B1f3WoUAtCXQHWfangkKJuWNtBpwWQCLSuuXhv__GFLGOn_UrdzxDs5TuXN8KbVYdcMWSYaQpypppL8FVE9jki78JQ/s400/2210+(4).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbZprZVQhmmif9XjyDnNyBpolab0NFFgUn2iypXSh21r4Rq3iYsKnpF04DF9sTkaYzg89YvRz3gBMPqwayJCbKbjyDJpVbgIA16npRPo1pCEs5MQLtceQD9H0eU2zgZvgVKPDqVeUXSz4/s400/2210+(9).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhi6pgATyZKrcqACxtyTITSqIdkuMwjJkSXbU7l0wo380G5WJY3XE6hyXypv0HYyTu71nr5_ANrd3qn-IvW4zyHgU-6ffQoH5Mcj0eBaz0EfYJ6eXvvj4pRTp0IOMKSIPnjZYYxhJ4j66o/s400/2210+(7).jpg)
The inevitable
! In each day's wake-respecting can not miss the B737-800 Ryanair!
! In each day's wake-respecting can not miss the B737-800 Ryanair!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaVc8C2gaVh99hMuv88dLsWca6cNJxl4_kU9WPWSJ5ibz2I4X6TYtUjHYFuAtN3m04WMdRmOzaysCUJ_AvogIpbu8BhMYyLDAinRxYeZLaIOSZmPKu5KM-hTAoIP8AF3d1vLEwrL39cw8/s400/2210+(11).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJDdhgzPEafWlnttLK1NuEAbNeSgN07IW7QZZBw3Of5Mox3DSYgHdwjLvsMdCA5Ksz412ygZ7MstRleQFNuLXHiRtwYm_Pc3NM22CofiCDFTMAqMdscbotrPUPrTPTs_pN91BCazcJqpU/s400/2210+(3).jpg)
is to conclude the atmospheric data of day. It may be noted that temperatures at high altitude, measured at 12Z, were very low, with peaks of nearly -70 ° C to 11000 meters! The low temperatures, combined with the presence of air close to saturation, favor the persistence of the wake (2).
diagram Appleman
Chart realativa humidity / temperature (it is considered a 10% error in relative humidity values \u200b\u200bto compensate for the dry bias day).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3KTFsN_XkTVzzr2pNBLH8eJe3mpC3Y_UHe0OhhHP58IbrE9DoSCeRJUvbu6oqhtc4wqZfdObAYkv9eOPmckJnIGzNru3l2nFLhAnW7c47s2mkkn2hdWNERcWuBC6rb5SdnWqnPGk7jHE/s400/p_118.jpg)
References (1) K. Gierens. Contrails, cirrus-contrail, and ship tracks (tutorial lecture)
(2) Cornell Aeronautical Laboratory INC.of Cornell University, Buffalo 21, NY Prediction of aircraft condensation trails contrails Project Final Report-1055-PS Report NOVC Contract No. Nonr-1857 (00) 31 October 1961.
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