Observations of tides and gravity waves in the lower thermosphere at 70 deg N

Details Observations of tides and gravity waves in the lower thermosphere at 70 deg N Observations of tides and gravity waves in the lower thermosphere at 70 deg N

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..107n&link_type=abstract

(The earth's middle and upper atmosphere; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission C /M

Other

1

Atmospheric Tides, Eiscat Radar System (Europe), Gravity Waves, Incoherent Scatter Radar, Thermosphere, Electron Density (Concentration), F Region, Field Aligned Currents, Vertical Distribution, Wind (Meteorology)

Scientific paper

Studies of the atmospheric tides and gravity waves at 70 deg N were made with the EISCAT incoherent scatter radar on 3, 4 and 8 Aug. 1988. This paper discusses measurements of the electron density and the field-aligned velocity, which is related to the horizontal meridional neutral-air wind. The phase of the 12 h oscillation in the neutral wind behaves smoothly with height on 3 Aug., but abrupt phase changes at 120 and 130 km are observed on 4 and 8 Aug., respectively. At lower heights the vertical wavelength of the 12 h oscillation is about 45 km, which corresponds to the (2, 4) component of the semidiurnal tide. On 4 Aug. the vertical wavelength above 120 km altitude is about 200 km, which most probably indicates the dominance of the (2, 2) mode. On the other hand, the phase above 130 km on 8 Aug. and in the F-region on 4 Aug. is nearly constant. The amplitude of the 12 h oscillation is quite variable from day to day, but it has a maximum at 100-110 km, which also speaks for the dominance of the (2, 4) mode. In the F-region above 150 km, complex patterns of gravity waves are observed on all three days, which break up into discrete frequency ranges when subjected to filtering. The day-to-day variability of the 12 h oscillation may be due to interaction between the semidiurnal tide and the gravity waves.

Affiliated with

Also associated with

No associations

Rating

Observations of tides and gravity waves in the lower thermosphere at 70 deg N 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 Observations of tides and gravity waves in the lower thermosphere at 70 deg N, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of tides and gravity waves in the lower thermosphere at 70 deg N will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1869196