Sunday, July 25, 2010 was a day of great interest to those who observe and study the phenomenon of condensation trails in Milan.
The blue sky and clean, ideal palette to bring out the best the white trails, high altitude air traffic at times sustained, and the extreme weather conditions have made it possible for optimum viewing of numerous and spectacular trails of aircraft, from early morning until late evening when the nearly full moon was the terminus of the last trails illuminating (exciting scene, or perhaps for some, spectral).
From a scientific point of view, several sono stati i motivi di interesse per questa giornata.
In primo luogo si sono osservate scie iridescenti, (identificate come scie aerodinamiche ), fenomeno che ho osservato piuttosto raramente. E' interessante notare come tali scie si siano formate a quote dove le condizione per la formazione delle normali scie di condensazione, in base ai dati atmosferici registrati alle ore 12Z, non erano presenti (si veda oltre nella sezione "Analisi dei dati atmosferici").
In secondo luogo, pur avendo osservato numerose scie persistenti, in base ai dati atmosferici delle 12Z non erano previste le condizioni per la persistenza, anche dopo correzione Miloshevich (per una spiegazione di tale correzione si veda questo post). Interesting
then also the particular temperature trend at high altitude because of which it was possible to observe aircraft fly higher without the wake of aircraft wake.
Sunday of contrails is placed last in a series of several days characterized by the limited presence of contrails.
The highlight of the day took place between 15:30 and 18:30 with the sky in the presence of many persistent contrails forming the classical crossings, and beautiful iridescent trails.
I photographed and identified by Flightradar24.com sites or similar line of thirty aircraft, most of them in flight at high altitude.
In today's post shows the most significant photos of the first part of the day and the usual analysis of weather data. In the next post will report the most significant photos of the second part of the day and a brief discussion of the observations made.
Photographs
The day begins well, with a massive persistent trail observed at 07:44.
follows a short passage of the A319 with a wake.
Swiss A319 HB-IPX
Altitude: 11,140 m
Routing: FCO-ZRH
At 8:23 I see a cute kestrel ( And thank's for the identification of prey ) in on my swing verticale (stranamente non apparso su Flightradar24.com forse a causa dell'assenza di transponder), segno inequivocabile che la giornata di spotting sarebbe stata fruttuosa!
Gheppio benaugurale GH-EPP
Altitude: 100 m circa
Routing: unknown
La mattinata, oltre a un B757-200 della Monarch ( foto , tracciato ) e a un B737 Norwegian ( foto , tracciato ), offre poco.
Nel primo pomeriggio iniziano invece le osservazioni interessanti. Intorno alle 15:10 transitano due apparecchi: l'A320 Swiss HB-IJO in volo a 9975 m con scia ( foto , tracciato ) e l'Airfrance A320 F-GKXA a 11285 m senza scia ( foto , tracciato ). L'Air France senza scia vola dunque più in alto dello Swiss con scia.
Come si può notare dalle fotografie, entrambi gli apparecchi rilasciano anche una scietta centrale (tentativamente identificata come drain mast).
Alle 15:30 inizio ad osservare la presenza di varie scie persistenti formanti i classici incroci.
Alla 16:19 osservo la prima scia aerodinamica della giornata. Uno spettacolo.
Aeroflot A320 VQ-BAZ
Altitude: 9464 m
Routing: SVO-NCE
Vediamo qui come appare la scia dell'Aeroflot dopo alcuni minuti.
Alle 16:23 osservo un B737 senza scia in volo a oltre 12mila metri.
Jetairfly B737 OO-JAO
Altitude: 12192 m
Mentre alle 16:27 osservo la seconda scia aerodinamica della giornata, rilasciata da un A320 Air Malta.
Air Malta 9H-AEO
Altitude: 9441 m
Routing: MLA-ZRH
Qui , la fotografia più countered. Around 16:30
also note crosses persistent contrails:
At 16:33 wake aerodynamic look further, this time an Avro RJ85.
Lufthansa CityLine Avro RJ85 D-AVRR
Altitude: 9761 m
Routing: MUC-NCE
Note that in this case the routing proposed by Flightradar24 is clearly wrong (the correct route is shown on the site Acarsd.org).
At 16:37 it's time to wake with a Lufthansa A321.
Lufthansa A321 D-AISZ
Altitude: 10,066 m
Routing: FRA-FCO
At 17:47 it was the turn of the inevitable B738 Ryanair, flying at 11,887 ft without wake photographed through the telescope.
Ryanair B738 EI-EBS
Altitude: 11,887
Routing: FKB-CIA
Finally, a classic crossing of contrails observed alle16: 50.
In the next post more pictures and a brief discussion on the comments made!
analysis of atmospheric data 12Z
Analysis of weather data recorded by the probe launched at the Milan Linate July 25, 2010 (now the launch 10:50 Z) :
diagram Appleman (verifying the conditions for the formation of contrails condensation). Chart
relative humidity / temperature with and without correction Miloshevich (verifying the conditions for persistence).
The probe has reached the typical flight altitudes, at about 11:20 Z (to 13:20) where they were provided for non-persistent contrails from 10,319 to 11,117 m. From 11,117 m to 12,000 m, the temperature began to rise, from 11,682 m and the conditions for training are not more were present.
Aerodynamic Contrails were formed between 9400 and 9700 meters. These shares weather conditions at the time of measurement did not allow the formation of trails according to the criterion of Appleman / Schrader.
E ', however, reported on the work of Gierens et al., (2008) that: As aerodynamic contrails are independent of the formation Conditions of jet contrails, They form an additional class of contrails Which might be complementary Because They form in predominantly That in layers are too warm for jet contrail formation.
The aerodynamic contrails are formed so primarily where the temperature is not cold enough for the formation of contrails. On
same work is also reported that: Aerodynamic contrails Also Appear in cruise levels persist WHERE They May When The ambient atmosphere is ice-supersaturated.
Obviously because a trail of ice persists, aerodynamics or not, it is necessary that the air is supersaturated with respect to ice. On July 25
hour of soundings were not present conditions for persistence. The probe, however, identified an area with a high relative humidity above ice saturation, at 8776 meters. At this depth, however, were not present conditions for the formation of contrails.
Technical Details on the photographs
The photographs were taken with a focal length variable from 17 to 400 mm. In one case, for Ryanair EI-EBS, I used a telescope (focal length 1200mm + 2X teleconverter). The photographs were processed to highlight the details of the trails.
Copyright Notice Copyright © 2010 - All rights reserved. All rights reserved. To request a reproduction of the photos send an e-mail: sciemilano@yahoo.it
The blue sky and clean, ideal palette to bring out the best the white trails, high altitude air traffic at times sustained, and the extreme weather conditions have made it possible for optimum viewing of numerous and spectacular trails of aircraft, from early morning until late evening when the nearly full moon was the terminus of the last trails illuminating (exciting scene, or perhaps for some, spectral).
From a scientific point of view, several sono stati i motivi di interesse per questa giornata.
In primo luogo si sono osservate scie iridescenti, (identificate come scie aerodinamiche ), fenomeno che ho osservato piuttosto raramente. E' interessante notare come tali scie si siano formate a quote dove le condizione per la formazione delle normali scie di condensazione, in base ai dati atmosferici registrati alle ore 12Z, non erano presenti (si veda oltre nella sezione "Analisi dei dati atmosferici").
In secondo luogo, pur avendo osservato numerose scie persistenti, in base ai dati atmosferici delle 12Z non erano previste le condizioni per la persistenza, anche dopo correzione Miloshevich (per una spiegazione di tale correzione si veda questo post). Interesting
then also the particular temperature trend at high altitude because of which it was possible to observe aircraft fly higher without the wake of aircraft wake.
Sunday of contrails is placed last in a series of several days characterized by the limited presence of contrails.
The highlight of the day took place between 15:30 and 18:30 with the sky in the presence of many persistent contrails forming the classical crossings, and beautiful iridescent trails.
I photographed and identified by Flightradar24.com sites or similar line of thirty aircraft, most of them in flight at high altitude.
In today's post shows the most significant photos of the first part of the day and the usual analysis of weather data. In the next post will report the most significant photos of the second part of the day and a brief discussion of the observations made.
Photographs
The day begins well, with a massive persistent trail observed at 07:44.
follows a short passage of the A319 with a wake.
Swiss A319 HB-IPX
Altitude: 11,140 m
Routing: FCO-ZRH
At 8:23 I see a cute kestrel ( And thank's for the identification of prey ) in on my swing verticale (stranamente non apparso su Flightradar24.com forse a causa dell'assenza di transponder), segno inequivocabile che la giornata di spotting sarebbe stata fruttuosa!
Gheppio benaugurale GH-EPP
Altitude: 100 m circa
Routing: unknown
La mattinata, oltre a un B757-200 della Monarch ( foto , tracciato ) e a un B737 Norwegian ( foto , tracciato ), offre poco.
Nel primo pomeriggio iniziano invece le osservazioni interessanti. Intorno alle 15:10 transitano due apparecchi: l'A320 Swiss HB-IJO in volo a 9975 m con scia ( foto , tracciato ) e l'Airfrance A320 F-GKXA a 11285 m senza scia ( foto , tracciato ). L'Air France senza scia vola dunque più in alto dello Swiss con scia.
Come si può notare dalle fotografie, entrambi gli apparecchi rilasciano anche una scietta centrale (tentativamente identificata come drain mast).
Alle 15:30 inizio ad osservare la presenza di varie scie persistenti formanti i classici incroci.
Alla 16:19 osservo la prima scia aerodinamica della giornata. Uno spettacolo.
Aeroflot A320 VQ-BAZ
Altitude: 9464 m
Routing: SVO-NCE
Vediamo qui come appare la scia dell'Aeroflot dopo alcuni minuti.
Alle 16:23 osservo un B737 senza scia in volo a oltre 12mila metri.
Jetairfly B737 OO-JAO
Altitude: 12192 m
Mentre alle 16:27 osservo la seconda scia aerodinamica della giornata, rilasciata da un A320 Air Malta.
Air Malta 9H-AEO
Altitude: 9441 m
Routing: MLA-ZRH
Qui , la fotografia più countered. Around 16:30
also note crosses persistent contrails:
At 16:33 wake aerodynamic look further, this time an Avro RJ85.
Lufthansa CityLine Avro RJ85 D-AVRR
Altitude: 9761 m
Routing: MUC-NCE
Note that in this case the routing proposed by Flightradar24 is clearly wrong (the correct route is shown on the site Acarsd.org).
At 16:37 it's time to wake with a Lufthansa A321.
Lufthansa A321 D-AISZ
Altitude: 10,066 m
Routing: FRA-FCO
At 17:47 it was the turn of the inevitable B738 Ryanair, flying at 11,887 ft without wake photographed through the telescope.
Ryanair B738 EI-EBS
Altitude: 11,887
Routing: FKB-CIA
Finally, a classic crossing of contrails observed alle16: 50.
In the next post more pictures and a brief discussion on the comments made!
analysis of atmospheric data 12Z
Analysis of weather data recorded by the probe launched at the Milan Linate July 25, 2010 (now the launch 10:50 Z) :
diagram Appleman (verifying the conditions for the formation of contrails condensation). Chart
relative humidity / temperature with and without correction Miloshevich (verifying the conditions for persistence).
The probe has reached the typical flight altitudes, at about 11:20 Z (to 13:20) where they were provided for non-persistent contrails from 10,319 to 11,117 m. From 11,117 m to 12,000 m, the temperature began to rise, from 11,682 m and the conditions for training are not more were present.
Aerodynamic Contrails were formed between 9400 and 9700 meters. These shares weather conditions at the time of measurement did not allow the formation of trails according to the criterion of Appleman / Schrader.
E ', however, reported on the work of Gierens et al., (2008) that: As aerodynamic contrails are independent of the formation Conditions of jet contrails, They form an additional class of contrails Which might be complementary Because They form in predominantly That in layers are too warm for jet contrail formation.
The aerodynamic contrails are formed so primarily where the temperature is not cold enough for the formation of contrails. On
same work is also reported that: Aerodynamic contrails Also Appear in cruise levels persist WHERE They May When The ambient atmosphere is ice-supersaturated.
Obviously because a trail of ice persists, aerodynamics or not, it is necessary that the air is supersaturated with respect to ice. On July 25
hour of soundings were not present conditions for persistence. The probe, however, identified an area with a high relative humidity above ice saturation, at 8776 meters. At this depth, however, were not present conditions for the formation of contrails.
Technical Details on the photographs
The photographs were taken with a focal length variable from 17 to 400 mm. In one case, for Ryanair EI-EBS, I used a telescope (focal length 1200mm + 2X teleconverter). The photographs were processed to highlight the details of the trails.
Copyright Notice Copyright © 2010 - All rights reserved. All rights reserved. To request a reproduction of the photos send an e-mail: sciemilano@yahoo.it
