Dopo alcuni mesi di digiuno, scorpacciata di scie d'aereo nel weekend a Milano grazie a un cielo senza copertura (smog a parte..), a temperature in quota molto basse (punte di quasi -68°C) e ad un traffico aereo discretamente sostenuto.
Sabato la giornata è stata caratterizzata da scie di breve durata, domenica da scie di più lunga durata. Tale differenza può essere spiegata tentativamente sulla base dei valori di umidità relativa alle tipiche quote di volo registrati domenica, sensibilmente più alti di quelli di sabato (riporto in fondo all'articolo, per chi fosse interessato, la consueta analisi dei dati atmosferici per entrambe le days).
In the days alternated periods of relative quiet, with few passages of aircraft wake, at times with multiple steps. On average I have observed and identified in each day, between 11:00 and 17:30 approximately forty aircraft wake in flight between 10000 to 12500 meters.
I took a series of photographs with aircraft wake using a SLR camera lens and a Newtonian telescope as well as identification of equipment on the site Flightradar24.com.
reproduce below some of these shots (air, attached to each track on the ADS-B - courtesy of Flightradar24.com ).
Saturday 5
I took a series of photographs with aircraft wake using a SLR camera lens and a Newtonian telescope as well as identification of equipment on the site Flightradar24.com.
reproduce below some of these shots (air, attached to each track on the ADS-B - courtesy of Flightradar24.com ).
Saturday 5
FedEx A310 N801FD . Flight altitude: 10,363 m
Ryanair B737-800 EI-DHY . Flight altitude: 11,582 m.
S7 Airlines A319 VP-BTS . Flight altitude: 11,278 m
Lufthansa A321 D-aisle . From Monaco [MUC] Barcelona [BCN]. Flight altitude: 11,278 m
Lufthansa A321 D-AIRO . From Frankfurt [FRA] in Rome [FCO]. Flight altitude: 10,058 m.
Vueling A320 EC-LAA . From Paris [CDG] in Rome [FCO]
Air France A320 F- GKXH . Flight altitude: 11,880 m.
Sunday 6
Vueling A320 EC-JTR . From Paris [CDG] in Rome [FCO]. Flight altitude: 11,278 m
Air France A319 F- GRXA . From Athens [ATH] Paris [CDG].
Air France A321 F-GTAJ . Flight altitude: 11,278 m.
Analysis of atmospheric data
very low temperatures at high altitude on both days, with net conditions for the formation of contrails. Relative humidity higher in the day on Sunday, with a value close to saturation on ice at 10,668 m (after correction Miloshevich). This difference in relative humidity might explain the longer duration of contrails on Sunday than on Saturday (compare the graphs relative humidity and temperature of the two days).
We see the charts. Saturday 5
diagram Appleman
Correction Miloshevich
Chart relative humidity / temperature
Sunday 6
diagram Appleman
Chart relative humidity / temperature
Copyright notice
Copyright © 2011 - All rights reserved. All rights reserved. To request a reproduction of the photos send an e-mail: sciemilano [at] yahoo.it
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