Coverage of Earth by the AIRS Instrument Suite

The AIRS instrument on NASA's Aqua satellite orbits Earth from pole-to-pole, fifteen times each day. The same area on Earth is covered two times per day, in a descending orbital pass which occurs at 1:30 am local time, and an ascending orbital pass at 1:30 pm local time. As the instrument moves along, it scans from side to side, creating a swath in which data is collected. At the north pole the swaths overlap but at the equator gaps occur between swaths. These gaps are eventually scanned within two to three days.

Orbit type sun synchronous polar orbit 

Orbit altitude 705 kilometers (438 miles)

Period 98.88 minutes

Orbits per day 14.5

Overpasses 2 per day: daytime ascending pass (south pole to north pole) at 1:30 pm local time; nighttime descending pass (north pole to south pole) occurs at 1:30 am local time

Daily coverage more than 95% of Earth’s surface

Swath width 1650 kilometers (1025 mi)

Resolution at nadir 13.5 kilometers (8.4 miles)

Resolution at scan extremes 41 x 21.4 kilometers (25.4 x 13.2 miles)

Samples per scanline across swath 90 footprints, each footprint is 1.1 degree