Information Regarding SONEX Images

Major SONEX Campaign References.

SONEX IMAGES

In an attempt to make the airborne DIAL ozone and aerosol scattering ratio images easy to use, the images were
generated using a limited number of color scales. The vertical scale factor is consistent between images, but
the horizontal scale factor may change from one image to the next without any specific notation.  The spacing
of time ticks should be sufficient to indicate when this has occurred. The aerosol scattering images are from
the infrared channel. Aerosol data are reported as Atmospheric Scattering Ratios.  Ozone data are reported as
mixing ratios (ppbv).

Resolution of the data are:

VERTICAL RESOLUTION:


Vertical averaging interval
        Aerosol     30 meters
Ozone      300 meters

Vertical display interval for averaged data
30 meters

HORIZONTAL RESOLUTION:

Aerosol horizontal averaging interval nadir - 2 seconds, or approximately 470 meters zenith - 60 seconds, or approximately 14 kilometers Ozone horizontal averaging interval 300 seconds, or approximately 70 km Horizontal display interval for averaged data (except flight overview images) either 6 or 8 seconds seconds, or approximately 1.4 or 1.8 kilometers respectively

Times on the images are Universal Time (UT).

The GIF aerosol and ozone image dimensions are 1050 X 850 pixels in order to retain resolution. Your WWW browser/GIF viewer may handle the image in various ways. On displays of less than 1050 X 850 pixels the image may have to be scrolled or the image may get resized, losing some clarity of the fonts.

These airborne DIAL data images are to be used as a reference to the digital data archived at NASA Ames Research Center. Please contact NASA Ames at email: gaines@cloud1.arc.nasa.gov for access to SONEX digital archived data. The images (both aerosol and ozone) viewed on this WWW page are from a full resolution data set, whereas, the digital data archived at AMES are a sub-sampled data set (1 profile/minute). If full resolution digital data are required, please contact the Lidar Applications Group.Images are not to be published without permission from NASA.

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