Springtime effects in the mesosphere and ionosphere observed at northern midlatitudes

Details Springtime effects in the mesosphere and ionosphere observed at northern midlatitudes Springtime effects in the mesosphere and ionosphere observed at northern midlatitudes

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006p%26ss...54..559a&link_type=abstract

Planetary and Space Science, Volume 54, Issue 6, p. 559-571.

Computer Science

Sound

1

Scientific paper

Nighttime volume emission rates and rotational temperatures, obtained from simultaneous observations of molecular oxygen and hydroxyl airglow at Almaty (43.25°N, 76.92°E) and Sierra-Nevada (37.2°N, 356.7°E), along with ionospheric density derived from foF2 in the vertical sounding ionograms over Almaty are analysed to study the variability and coupling of parameters observed in the upper mesosphere and ionosphere during the period of February April, 2000. Ionospheric critical frequency measurements and airglow observations by the Mesopause Rotational Temperature Imager (MORTI) at Almaty and the Spectral Airglow Temperature Imager (SATI) at Sierra-Nevada Observatories show an increase in long-period planetary wave (PW) activity from the end of February until the middle of March, 2000. Very good agreement was found in the temporal variations of emission rates and rotational temperatures from March 1 15, 2000 measured at the Almaty and Sierra-Nevada sites. Similar perturbations could also be seen in the ionospheric critical frequency (ΔfoF2) obtained as a difference between current foF2 values and an ionospheric background level. The perturbations observed have been interpreted employing the Met office stratospheric model results. Latitudinal structure of a quasi 5-day wave was identified, for which the first-symmetric-mode amplitude and symmetric behaviour of phase are in good agreement with theoretical prediction. The analysis of the Met office stratospheric data indicate the presence of westward-propagating PW with periods of ˜5 and 10 days during the period of interest. The temporal correlation between planetary scale oscillations observed in the datasets examined (ionospheric, optical and meteorological) suggest dynamical coupling with the stratosphere. A negative disturbance in ΔfoF2 of ˜25% observed 1 day before a sharp increase in the MORTI mesospheric rotational temperature registered on March 10 at Almaty, is also discussed in the context of the possible stratosphere/mesosphere/ionosphere coupling.

Affiliated with

Also associated with

No associations

Rating

Springtime effects in the mesosphere and ionosphere observed at northern midlatitudes 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 Springtime effects in the mesosphere and ionosphere observed at northern midlatitudes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Springtime effects in the mesosphere and ionosphere observed at northern midlatitudes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-930970