This web page's content and links are no longer actively maintained. It is available for reference purposes only. NASA Official: Charles Jackman
 

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HRDI's PLOTS

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  Browse HRDI's plots:

 

Plots from UARS Instruments : Sensor  = > HRDI

Composite of HRDI and WINDII meridional winds

HRDI_WINDII_MWIND

Composite of HRDI and WINDII meridional winds from the spring periods of 1993 and 1994 in the altitude range 10-200 km, for a local time of 12:00. The
prominent oscillations about the equator in the MLT region are due to the (1,1) diurnal tide. 

Monthly mean background zonal winds observed by HRDI

HRDI_EQ_BACKGROUND_ZWIND

Monthly mean background zonal winds (averaged over longitude and with the tides removed) observed by HRDI at the equator from November, 1991 to March,
1995. The mesosphere semiannual oscillation (SAO), maximizing near an altitude of 80 km and the quasi-biennial oscillation (QBO), peaking near 25 km, are the
most prominent features. 

HRDI equatorial background zonal winds
HRDI_EQ_RESIDUAL_ZWIND

HRDI equatorial background zonal winds with the semiannual and annual variations and a linear trend term and mean removed to reveal the 'residual' flow, which
clearly shows a biennial variation in the MLT region which is anticorrelated in phase with the stratospheric QBO. 

HRDI nightglow map
HRDI_NIGHTGLOW_MAPS

Brightness maps (upper 4 panels) of the O2 nightglow observed by HRDI on 4 different days. The prominent band at the equator is a tidal feature which brightens
and then disappears due to the local time precession of the UARS orbit. The diurnal tidal behavior of the nightglow is more clearly shown in a composite of about 6
weeks of data (lower panel), which shows the local time variability as a function of latitude. 

HRDI monthly mean semidiurnal tide amplitudes
HRDI_SEMIDIURNAL

HRDI monthly mean semidiurnal tide amplitudes for the zonal (upper panel) and meridional wind (lower panel) components at an altitude of 95 km. Strong seasonal
variabilities and interhemispheric asymmetries are revealed. 

HRDI southern hemisphere wind maps
HRDI_VORTEX_BREAKUP

Sequence of 4 HRDI southern hemisphere wind maps, documenting the breakup of the polar vortex during the Antarctic spring of 1993. 

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