Mesospheric temperature estimation from meteor decay times of weak and strong meteor trails

Kim, Jeong‐Han; Kim, Yong Ha; Jee, Geonhwa; Lee, Chang-Sup

doi:10.1016/j.jastp.2012.07.003

Cited by 24 publications

(40 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The seasonal variation in the temperatures estimated from the Kunming meteor radar shows a minimum during the summer (June–August) and a maximum during the winter (December–February), which agrees with the results of previous studies [e.g., Singer et al , , ; Hocking et al , ; Holdsworth et al , ; Stober et al , ; Das et al , ; Kim et al , ]. The variation in temperature between summer and winter is typically less than approximately 30 K. However, the temperatures estimated from the Kunming meteor radar exhibit a large warming in spring (late April) and autumn (late October).…”

Section: Resultssupporting

confidence: 90%

“…To improve the accuracy of the slope estimation, it is necessary to remove nonrepresentative data such as outliers and biased values [e.g., Hocking et al , ; Cervera and Reid , ; Holdsworth et al , ; Kim et al , ]. Hocking [], and Holdsworth et al [] stated that the slope is almost independent of the zenith angle, whereas the correlation between the height ( h ) and the log of the diffusion coefficients ( d ) decreases with increasing zenith angles.…”

Section: Theory and Methodsmentioning

confidence: 99%

“…Hocking [], and Holdsworth et al [] stated that the slope is almost independent of the zenith angle, whereas the correlation between the height ( h ) and the log of the diffusion coefficients ( d ) decreases with increasing zenith angles. Kim et al [, ] suggested that only weak meteor echoes should be used to estimate the temperature because the decay of strong meteor trails is controlled by chemical recombination processes as well as diffusion processes, whereas the decay of weak meteor trails is largely controlled by diffusion processes alone. Thus, we limited the zenith angle to below 50° in this study to select the weak meteor echoes and ensure that the correlation is good.…”

Section: Theory and Methodsmentioning

confidence: 99%

“…This technique compares two normally distributed independent measurements, d and h , without a priori knowledge of the measurement errors ε d and ε h . In this study, the technique was used to determine the relative magnitude (or slope of the best fit line) of d versus h [e.g., Holdsworth et al , ; Hocking et al , ; Kim et al , ]. Therefore, d was used as an independent variable to determine the slope S d .…”

Section: Theory and Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of mesopause temperatures at low latitudes using the Kunming meteor radar

Xue

Chen

et al. 2016

Radio Science

View full text Add to dashboard Cite

In this study, mesopause temperatures over a low‐latitude station were derived by applying the temperature gradient model technique to data from a meteor radar installation located in Kunming (25.6°N, 103.8°E), China. The estimated temperatures are in good agreement with Sounding of the Atmosphere by Broadband Emission Radiometry (SABER) temperatures and exhibit clear seasonal and interannual variations with dominant spectral peaks at annual, semiannual, quasi 90 day, and terannual oscillations. However, the amplitudes of the temperature fluctuations and the dominant spectral peaks are larger than those from SABER. An improved method that accounts for the temperature sensitivity of the slope estimated from the meteor radar data was developed to calibrate the larger fluctuations obtained using the temperature gradient model technique. The resulting calibrated temperatures are more consistent with SABER observations, and the accuracy of the derived temperatures is significantly improved.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Theory and Methodsmentioning

confidence: 99%

Section: Theory and Methodsmentioning

confidence: 99%

Section: Theory and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of mesopause temperatures at low latitudes using the Kunming meteor radar

Xue

Chen

et al. 2016

Radio Science

View full text Add to dashboard Cite

show abstract

“…A VHF meteor radar has been in operation since March 2007 at KSS on the King George Island located about 150 km north of the Antarctic Peninsula. The radar system is composed of a cross‐folded dipole transmitter and five receivers arranged to minimize mutual antenna coupling (see Kim et al [] and Lee et al [] for further details). Since 2012, the peak transmitter power has been increased from 8 kW to 12 kW, resulting in increase in the number of received echoes [ Jee et al , ].…”

Section: Data and Analysis Methodsmentioning

confidence: 99%

Meteor radar observations of vertically propagating low‐frequency inertia‐gravity waves near the southern polar mesopause region

et al. 2017

View full text Add to dashboard Cite

Vertically propagating low‐frequency inertia‐gravity waves (IGWs) are retrieved from meteor radar winds observed at King Sejong Station (KSS: 62.22°S, 58.78°W), Antarctica. IGW horizontal winds extracted from temporal band‐pass filtering in regular time‐height bins show the frequent occurrence of IGWs with the downward phase progression and the counterclockwise rotation of their horizontal wind vectors with time (i.e., upward energy propagation) near the mesopause region throughout the whole year of 2014. The vertical wavelengths of the observed IGWs roughly range from 14 km to more than 20 km, which is consistent with previous observational studies on the mesospheric IGWs over Antarctica. Stokes parameters and rotary spectra computed from the hodographs of the IGW horizontal wind components reveal that the intrinsic frequencies of the upward propagating IGWs are |f|−3|f| with seasonal variations of the relative predominance between |f|−2|f| and 2|f|−3|f|, where f is the Coriolis parameter at KSS. The hodograph analysis also indicates that the N‐S propagation is dominant in austral summer, while the NE‐SW propagation is pronounced in austral winter. The propagation direction is discussed in relation to the generation of IGWs due to dynamical imbalances occurring in the tropospheric and stratospheric jet flow systems. Ray tracing results indicate that the N‐S propagation in summer may be due to the jet flow systems roughly north of KSS and the NE‐SW propagation in winter may be either the SW propagation from the jet flow systems northeast of KSS or the NE propagation (around the South Pole) from the south of Australia and Southern Indian and Pacific Oceans.

show abstract

A climatology of medium‐scale gravity wave activity in the midlatitude/low‐latitude daytime upper thermosphere as observed by CHAMP

et al. 2014

View full text Add to dashboard Cite

We report on a detailed global climatology of medium-scale (150-600 km) thermospheric gravity wave (GW) activity using mass density observations onboard the CHAMP satellite from 2001 to 2010. Our study focuses mainly on daytime (09-18 h in local time) and midlatitude/low-latitude upper thermosphere between 300 km and 400 km altitudes. Midlatitude GW activity is strongest in the winter hemisphere. GW activity during June solstice adjacent to the Andes and Antarctic Peninsula is stronger than in any other season or location. GW activity in the low-latitude summer hemisphere is stronger above continents than above oceans: especially during December solstice and equinoxes. In terms of relative density variation, GW activity is stronger during solar minimum than solar maximum. These results agree well with the characteristics of stratospheric GWs, implying that the CHAMP GWs are mainly caused by GWs from tropospheric/stratospheric processes. Using mesosphere/lower thermosphere wind observations at a Korean Antarctic station, we investigated at which altitudes the upper thermospheric GW climatology becomes visible. While the correlation is insignificant at z = 82-88 km, it becomes significant for most cases at z = 90-98 km, suggesting that the upper thermospheric GW climatology may start to emerge at z ≥ 90 km.

show abstract

Mesospheric temperature estimation from meteor decay times of weak and strong meteor trails

Cited by 24 publications

References 49 publications

Estimation of mesopause temperatures at low latitudes using the Kunming meteor radar

Estimation of mesopause temperatures at low latitudes using the Kunming meteor radar

Meteor radar observations of vertically propagating low‐frequency inertia‐gravity waves near the southern polar mesopause region

A climatology of medium‐scale gravity wave activity in the midlatitude/low‐latitude daytime upper thermosphere as observed by CHAMP

Contact Info

Product

Resources

About