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VIIRS Pass Frequency

GINA collects satellite data around the clock from the satellites that pass over Alaska every day. This graphic shows the number of VIIRS infrared passes received each day by GINA’s Direct Broadcast antennas. The North Slope of Alaska into the Arctic Ocean is the most frequently covered area, with around 16-18 passes per day. Radiating …

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On Fire Pixel Saturation

The Tatlawiksuk Fire, 41 miles south of McGrath, has been burning steadily (as of posting) since June 4th, sparked by the recent lightning storms in Southwest Alaska last week. These VIIRS animations of DayLandCloudFire (left) and the i04 band (right) show the change of the fire perimeter (in bright red) from June 8th to June …

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The Problem with Parallax: Part 2

This is the second of a three part series about parallax problems with satellite data. Part 1 presented an overview of parallax in this context and reviewed differences in orbital characteristics of geostationary and polar satellites. In this section we’ll examine more closely parallax issues associated with geostationary satellites. Part 3 will cover the topic …

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Unusual Cloud Streaks from Oil Flares

Interesting cloud formation on the Alaska’s North Slope 08 Feb 2022. This streaking appearance of clouds is often caused by a moist layer and mechanical lift generated by terrain, but this is pretty flat territory…

Inversion in Fairbanks

Despite a brief heat wave a couple weeks ago, cold temperatures have returned again to Fairbanks with a strong winter inversion. Recent CSPP NUCAPS sounding is shown below on the left, compared with the Fairbanks sounding on the right. The red line is the vertical temperature profile, and the green line is the dewpoint depression profile. …

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