Sunphotometer fleet developments

Fleet in development

New developments in sunphotometry, left, prototype SEASTAR (SEAgoing Sky-scanning, sun-Tracking Atmospheric research Radiometer) for ship-based deploy...

4STAR team on successful ORACLES 2018 deployment

4STAR was deployed on the NASA P3 during ORACLES 2018 based out of Sao Tomé. Here our team kept 4STAR operating great for the whole deployment. 

Roy Johnson presenting SEASTAR concept

Roy presenting new concept idea of SEASTAR at Ames Innovation...

Roy is leading and presenting a new concept for a shipborne automated sunphtometer and sky radiance collector, SEASTAR, at the NASA Ames Research Cent...

New partners with NRC Canada - 4STAR integrated onto the Convair...

We formed a new partnership with the Canadian National Research Council. We sucessfully integrated 4STAR onto their Convair 580, for sampling during a...

AATS, 4STARB, and 4STAR staring at the sunrise

Calibrating away at Mauna Loa Observatory

4STAR, 4STARB, and AATS are standing tall at the Maun Loa Observatory, at 11000 ft altitude within the remote Pacific Atmosphere, where the nearly pri...

Yohei holding 4STARB in the NASA C130 cockpit during NAAMES-3

4STARB's first flight campaign successful!

Yohei holding 4STARB in the NASA C130 cockpit getting ready for a daily install. This was 4STARB's first flight campaign, as part of the 3rd deploymen...


About us:

We are a research group at NASA Ames Research Center
specializing in measurements and analysis of atmospheric
composition. We focus on aerosol radiative properties, trace gas
retrievals, and cloud properties. We utilize airborne sunphotometers
and various satellite instruments.   

Current Projects:

Field missions using our airborne sunphotometers:

Projects we are involved with:

  • Calipso - MODIS - OMI: global aerosol properties (lead)
  • HQ20
  • Neural Network Retrievals of Aerosols Above Clouds
  • 4STAR instrument improvement (AITT)