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None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
We have developed a new predictive model of aviation radiation.
These energies span the range of medical X-ray machines and airport security scanners.
Column definitions: (1) The flight number; (2) The maximum dose rate during the flight, expressed in units of natural radiation at sea level; (3) The maximum altitude of the plane in feet above sea level; (4) Departure city; (5) Arrival city; (6) Duration of the flight.
The Hot Flights Table is a daily summary of these calculations.
It shows the 5 charter flights with the highest dose rates; the 5 commercial flights with the highest dose rates; 5 commercial flights with near-average dose rates; and the 5 commercial flights with the lowest dose rates.
Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. The orbits are color-coded by velocity, from slow (red) to fast (blue).
The cause of all this was an extraordinary solar flare witnessed the day before by British astronomer Richard Carrington. 1, 1859, marked the discovery of solar flares and foreshadowed a new field of study: space weather. This ruby-red crystal necklace went along for the ride: You can have it for 9.95.
Approximately once a week, and the students of Earth to Sky Calculus fly space weather balloons to the stratosphere over California.