Tidal influence in the determination of long-term trends in the mesosphere-lower thermosphere from LIDAR observations

2020 ◽  
Vol 206 ◽  
pp. 105323
Author(s):  
David A. Krueger ◽  
Chiao-Yao She ◽  
Jens Oberheide
Keyword(s):  
Lower Thermosphere ◽  
Tidal Influence ◽  
Long Term Trends ◽  
Lidar Observations

Solar cycle dependence and long-term trends in the wind field of the mesosphere/lower thermosphere

1997 ◽  
Vol 59 (5) ◽  
pp. 497-509 ◽  
Author(s):  
J. Bremer ◽  
R. Schminder ◽  
K.M. Greisiger ◽  
P. Hoffmann ◽  
D. Kürschner ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Wind Field ◽  
Lower Thermosphere ◽  
Long Term Trends ◽  
Cycle Dependence

scholarly journals A review of recent MLT studies at low latitudes

2004 ◽  
Vol 22 (9) ◽  
pp. 3261-3275 ◽  
Author(s):  
B. R. Clemesha
Keyword(s):  
Lower Thermosphere ◽  
Temperature Structure ◽  
Mesopause Region ◽  
The Pacific ◽  
Low Latitudes ◽  
Long Term Trends ◽  
The Caribbean ◽  
Temperature Inversions ◽  
Mlt Region

Abstract. Recent years have shown a continuing interest in studies of the mesosphere-lower thermosphere region at low latitudes, with more than 50 papers dealing specifically with this area published over the past 5 years. Experimental ground-based work has been carried out mainly in South America and the Caribbean, India and the Pacific areas. Subjects of interest include gravity waves, tides and planetary waves, the temperature structure of the mesopause region, with special reference to temperature inversions and the two-level mesopause, sporadic neutral layers and their relationship with ionized layers, the possible effects of the micrometeoroid influx, and long-term trends in the MLT region. Experimental techniques in use include MF, MST and meteor radar, lidar, airglow (including satellite-borne limb-scanning measurements) and rocket-borne instruments. Airglow imaging has shown itself to be a particularly useful technique, mainly for studying gravity wave propagation in the MLT region. This paper will present highlights of recent work and will discuss some of the problems which remain to be resolved.

scholarly journals The method of determination of the long-term trends in the F2 region independent of geomagnetic activity

2002 ◽  
Vol 20 (4) ◽  
pp. 511-521 ◽  
Author(s):  
A. D. Danilov
Keyword(s):  
Geomagnetic Activity ◽  
Regression Line ◽  
Close Relation ◽  
Layer Parameter ◽  
Modeling And Forecasting ◽  
Long Term Changes ◽  
Long Term Trends ◽  
Ap Index

Abstract. A detailed analysis of the f oF2 data at the Sverdlovsk station is performed to answer the question: whether the long-term trends of the F2-layer parameter detected recently are mainly due to the long-term changes in geomagnetic activity during the recent decades. Two methods to derive trends independent of geomagnetic activity are developed. It is found that both methods agree well and give a relative nongeomagnetic trend of about - 0.0015 per year (or an absolute nongeomagnetic trend of about - 0.015 MHz per year). The close relation of foF2 to Ap found by several authors is mainly due to a high correlation between the foF2 deviations from the regression line and year-to-year changes in the Ap index rather than to systematic long-term changes of Ap as has been suggested earlier.Key words. Ionosphere (ionospheric distances; modeling and forecasting)

Long-term trends and year-to-year variability of mid-latitude mesosphere/lower thermosphere winds

2006 ◽  
Vol 68 (17) ◽  
pp. 1890-1901 ◽  
Author(s):  
Yu.I. Portnyagin ◽  
E.G. Merzlyakov ◽  
T.V. Solovjova ◽  
Ch. Jacobi ◽  
D. Kürschner ◽  
...  
Keyword(s):  
Lower Thermosphere ◽  
Long Term Trends

scholarly journals Low-frequency lower E-region wind and reflection height measurements as sensor for climate variability

2008 ◽  
Vol 6 ◽  
pp. 331-335 ◽  
Author(s):  
C. Jacobi
Keyword(s):  
Oblique Incidence ◽  
Lower Thermosphere ◽  
Low Frequency ◽  
Time Interval ◽  
Radio Waves ◽  
Reflection Height ◽  
E Region ◽  
Long Term Trends ◽  
Mlt Region

Abstract. Measurements of reflection heights of low-frequency (LF) radio waves at oblique incidence and estimates of mesosphere/lower thermosphere (MLT) region horizontal winds applying the D1 spaced receiver method on LF field strength registrations are analyzed with respect to possible long-term trends and interdecadal variability in the time interval from ~1980 to date. While no clear signal of mesospheric height trend is registered during the last two decades, significant trends of MLT horizontal winds are found. These trends are non-linear, in particular a change of trends around 1990 is found, which is probably connected with changes in tropospheric and stratospheric conditions at that time.

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