Lidar studies of the nighttime sodium layer over Urbana, Illinois. I - Seasonal and nocturnal variations

Details Lidar studies of the nighttime sodium layer over Urbana, Illinois. I - Seasonal and nocturnal variations Lidar studies of the nighttime sodium layer over Urbana, Illinois. I - Seasonal and nocturnal variations

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113659g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13659-13673.

Other

63

Annual Variations, Night Sky, Nocturnal Variations, Optical Radar, Radar Data, Sodium, Cities, Density Distribution, Temporal Distribution

Scientific paper

Sodium lidar measurements obtained between December 1980 and May 1986 at Urbana, IL, are compared with other reported lidar measurements and with recently developed models of the layer. Sodium abundance at Urbana reaches a maximum value in November, December, and January which is approximately 4.5 times larger than the June minimum value of 2.15 x 10 to the 9th/sq cm. Also in November and December, the layer centroid height is about 1.5 km lower than the yearly average value of 92 km. There is no significant seasonal variation of the rms layer width, which has an average value of approximately 4.25 km. The peak-to-peak variations of the centroid height and rms width of the average nocturnal layer are 1 km and 600 m, respectively. The semidiurnal tide is primarily responsible for a 36 percent peak-to-peak abundance variation in the average nocturnal layer which is compatible with a 20 cm/s amplitude for the vertical wind velocity. The vertical phase velocity of the density perturbations is approximately 1 m/s which implies a 45-km vertical wavelength for the semidiurnal tide. Because of gravity waves and tides, the structure of the nocturnal layer changes substantially throughout the night. Variations of over 200 percent in abundance, 2 km in centroid height, and 1 km in rms width have been observed within the time span of a few hours.

Affiliated with

Also associated with

No associations

Rating

Lidar studies of the nighttime sodium layer over Urbana, Illinois. I - Seasonal and nocturnal variations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Lidar studies of the nighttime sodium layer over Urbana, Illinois. I - Seasonal and nocturnal variations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lidar studies of the nighttime sodium layer over Urbana, Illinois. I - Seasonal and nocturnal variations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1125543