Page Comparison

Jan 25 2022. 

article from prior work: ADS-B.pdf

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Try this: https://www.rtl-sdr.com/rtl-sdr-quick-start-guide/

Nope. 

Try this: sudo port install gqrx

had to 'accept' Xcode license- sudo xcodebuild -license

then 

sudo port install gqrx

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Here are references I don't think I saw before:
div-class-title-aviation-and-jet-contrails-impact-on-astronomy-div.pdf
ICRATcontrails_JR050412.pdf
Geophysical Research Letters - 2021 - Bräuer - Airborne Measurements of Contrail Ice Properties Dependence on Temperature.pdf
AI_detection_usingGOES
MergingSatelliteAndADS-B

Tried out using API key access to Flight Aware database. Used old user account under astrostubbs@gmail.com 

API key is 

1Q0ffUe5VyAsIASAFAwcJiYjs7Mse0nh

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Flight altitudes depend on vertical separation convention:

Flight levels for northbound vs southbound air traffic over Chile are typically based on the hemispheric rule, also known as the "East/West rule" or "RVSM (Reduced Vertical Separation Minimum) rule". However, since Chile is in the Southern Hemisphere, the rule is applied differently compared to the Northern Hemisphere. Here's how it generally works:

1. Northbound traffic (odd flight levels):
   • FL290 (29,000 feet)
   • FL310 (31,000 feet)
   • FL330 (33,000 feet)
   • FL350 (35,000 feet)
   • FL370 (37,000 feet)
   • FL390 (39,000 feet)
   • FL410 (41,000 feet)
2. Southbound traffic (even flight levels):
   • FL280 (28,000 feet)
   • FL300 (30,000 feet)
   • FL320 (32,000 feet)
   • FL340 (34,000 feet)
   • FL360 (36,000 feet)
   • FL380 (38,000 feet)
   • FL400 (40,000 feet)

Key points to note:

1. This is the opposite of what's used in the Northern Hemisphere, where eastbound flights use odd flight levels and westbound flights use even levels.
2. The actual flight levels used may vary based on specific air traffic control instructions, weather conditions, or other operational factors.
3. Below FL290, different rules may apply, and separation is often managed by air traffic control based on various factors including terrain and traffic density.
4. Some high-altitude aircraft may operate above these levels, following specific procedures and clearances.
5. Local variations or exceptions may exist, especially near major airports or in areas with complex airspace structures.

Tried out using API key access to Flight Aware database. Used old user account under astrostubbs@gmail.com 

API key is 

1Q0ffUe5VyAsIASAFAwcJiYjs7Mse0nh

this shell script (GetFlights3.sh) worked (after some fussing around)

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./DoIt.sh | sort -k 8 -n -r

Contrail likelihood:

Image Added

Now go find winds aloft. The Windy API lets us do this. But its arguments are pressure levels in hPascals, like 300h, which corresponds to about 30,000 feet altitude. 
here is APi kee: WindyAPI.txt
this script spits out predictions for Rubin site:
Windy.sh

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