Variability of mesopause temperature derived from two independent methods using meteor radar and its comparison with SABER and EOS MLS and a collocated multi-wavelength dayglow photometer over an equatorial station, Thumba (8.5° N, 76.5° E)

Das, Siddarth Shankar; Kumar, Karanam Kishore; Das, Subrata Kumar; Vineeth, C.; Pant, Tarun Kumar; Ramkumar, Geetha

doi:10.1080/01431161.2011.643461

Cited by 8 publications

(13 citation statements)

References 28 publications

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“…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%

“…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). This result is consistent with the SABER observations but differs from previous research [e.g., Singer et al , , ; Hocking et al , ; Holdsworth et al , ; Stober et al , ; Das et al , ; Kim et al , ].…”

Section: Resultssupporting

confidence: 88%

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

Xue

Chen

et al. 2016

Radio Science

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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.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 88%

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

Xue

Chen

et al. 2016

Radio Science

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“…Kumar (2007) compared TIMED/SABER and MR temperature height profiles for three single days near the equator. Das et al (2012) compared three years of SKiYMET daily meteor temperatures with TIMED/SABER, MLS, and OH photometer data near the equator. An advantage in nearpolar sampling is that there are large variations in winter temperatures, particularly related to planetary waves and sudden stratwarms (SSW), though MLS, according to the data gaps seen in this paper, seems to have some difficulty in the presence of a very major SSW, e.g.…”

Section: Introductionmentioning

confidence: 99%

Eureka, 80° N, SKiYMET meteor radar temperatures compared with Aura MLS values

et al. 2013

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The meteor trail echo decay rates are analysed on-site to provide daily temperatures near 90 km. In order to get temperatures from trail decay times, either knowledge of the pressure or the background temperature height gradient near 90 km is required (Hocking, 1999). Hocking et al. (2004) have developed an empirical 90 km temperature gradient model depending only on latitude and time of year, which is used in the SKiYMET on-site meteor temperature analysis.

Here we look at the sensitivity of the resulting temperature to the assumed gradient and compare it and the temperatures with daily AuraMLS averages near Eureka. Generally there is good agreement between radar and satellite for winter temperatures and their short-term variations. However there is a major difference in mid-summer both in the temperatures and the gradients. Increased turbulence in summer, which may overwhelm the ambipolar diffusion even at 90 km, is likely a major factor.

These differences are investigated by generating ambipolar-controlled decay times from satellite pressure and temperature data at a range of heights and comparing with radar measurements. Our study suggests it may be possible to use these data to estimate eddy diffusion coefficients at heights below 90 km. Finally the simple temperature analysis (using satellite pressures), and a standard meteor wind analysis are used to compare mean diurnal variations of temperature (T) with those of zonal wind (U) and meridional wind (V) in composite multi-year monthly intervals

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“…The winds derived from the Thumba meteor radar are well comparable with MF radar (Kumar et al, 2007) and TIDI observations , and the meteor-radar-derived mesopause temperature is well comparable with SABER and dayglow photometer (Das et al, 2012). For the present study, we have used the wind measurements on the control and eclipse day.…”

Section: Methodsmentioning

confidence: 95%

First observational study during a solar eclipse event on variations in the horizontal winds simultaneously in the troposphere-stratosphere-mesosphere-lower-thermosphere region over the equatorial station Thumba (8.5°N, 77°E)

et al. 2013

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The longest annular solar eclipse of the millennium occurred on 15 January, 2010, and was visible over the equatorial station Thumba (8.5 • N, 77• E) around noon time. A host of experiments were carried out to study the variations due to the solar eclipse event on various geophysical parameters, from the Earth's surface to ionospheric heights. The present study focuses on the variation in the horizontal winds in the height regions of 0-65 km and 80-100 km, using GPS-sondes, rocket-sondes and meteor wind radar. The observations were made during, and after, the maximum obscuration on the day of the eclipse, as well as at the same time on a control day. The observations showed a strengthening/weakening of winds along with directional changes both in zonal and meridional winds in the selected height domains. A drastic change from easterly to westerly is observed at 98 km during, and after, the maximum phase, but, for the meridional wind, the reversal is observed only after the maximum phase. Variations due to the eclipse were also observed around the tropopause and stratopause in both wind components. However, the observed changes in winds around the tropopause and stratopause could not be attributed unambiguously to the eclipse as day-to-day wind variability is not available in these height regions. The significance of the present study lies in reporting the variations in the horizontal wind components from the ground to the 100-km height region (with a gap around 65-80 km), and the characteristics of the atmospheric waves generated due to the mid-day annular solar eclipse.

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Variability of mesopause temperature derived from two independent methods using meteor radar and its comparison with SABER and EOS MLS and a collocated multi-wavelength dayglow photometer over an equatorial station, Thumba (8.5° N, 76.5° E)

Cited by 8 publications

References 28 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

Eureka, 80° N, SKiYMET meteor radar temperatures compared with Aura MLS values

First observational study during a solar eclipse event on variations in the horizontal winds simultaneously in the troposphere-stratosphere-mesosphere-lower-thermosphere region over the equatorial station Thumba (8.5°N, 77°E)

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