Response of the mesopause temperatures to solar activity over Yakutia in 1999–2013

Аммосов, Петр; Gavrilyeva, Galina; Ammosova, A. M.; Koltovskoi, Igor

doi:10.1016/j.asr.2014.06.007

Cited by 25 publications

(16 citation statements)

References 25 publications

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“…It is interesting to compare our findings with results published in a series of recent papers dedicated to temperature trends in the mesopause region using airglow measurements and model simulations. Ammosov et al () have estimated a long‐term trend of −2.1±1.5 K/decade in the mesopause derived from OH(6‐2) rotational temperature at the Maimaga station (63°N) for 1999–2013. Offermann et al () have found that monthly long‐term winter mesopause temperature trends (−6 ÷ −2 K/decade) are generally stronger compared to summer ones (−2 ÷ +0.5 K/decade), with the mean long‐trend of −2.3 K/decade.…”

Section: Discussionmentioning

confidence: 99%

Updated Long‐Term Trends in Mesopause Temperature, Airglow Emissions, and Noctilucent Clouds

et al. 2020

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We have updated long‐term trends in mesopause temperature, airglow emission intensities, and noctilucent clouds (NLCs) based on ground‐based observations conducted in the Moscow region (Russia). Trends in mesopause temperature and airglow emissions have been derived for the period 2000–2018 (19 years), and long‐term trends in NLC characteristics have been obtained for 1968–2018 (51 years). Trends in airglow emissions have been estimated separately for winter and summer seasons. There are statistically significant negative trends in molecular oxygen O2 A(0‐1) and hydroxyl OH(6‐2) emission intensities in both winter and summer. Responses of the airglow intensities to solar activity have been found to be significantly positive, with winter ones being 1.5–2 times greater than summer ones. There is a rather strong and statistically significant cooling of the summer mesopause at a rate of −2.4±2.3 K/decade, whereas the winter mesopause demonstrates a small and statistically insignificant cooling of −0.4±2.2 K/decade. The response of the mesopause temperature to solar activity is positive and about 2 times greater in winter than in summer. We consider long‐term trends in the summer mesopause temperature and NLC for the same time period and same geographical region. Secular trends in NLC parameters have been found to be small and statistically insignificant as observed from midlatitudes. NLCs demonstrate statistically significant negative response to solar activity. Ozone forcing produces minor effects on both airglow and NLC characteristics. The observed small secular NLC trends contradict large modeled NLC trends recently obtained by Lübken et al. (2018, https://doi.org/10.1029/2018GL077719).

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Section: Discussionmentioning

confidence: 99%

Updated Long‐Term Trends in Mesopause Temperature, Airglow Emissions, and Noctilucent Clouds

et al. 2020

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“…A wide scatter of literatures have investigated the solar activity influence on upper atmosphere temperature [Remsberg, 2009;She et al, 2009;Offermann et al, 2010;Ammosova and Ammosov, 2012;Savigny et al, 2012;Ammosov et al, 2014;Forbes et al, 2014;Oindrila and Sridharan, 2014;Ramesh et al, 2015]. Beig et al [2008] and Beig [2011] provided a compilation of the existing studies quantifying the sensitivity of middle atmospheric temperatures to solar activity in terms of the 11 year solar activity cycle; the majority estimations lie in the range from 0 to 10 K/100 sfu in mesopause region.…”

Section: Discussionmentioning

confidence: 99%

“…The 10.7 cm solar radio flux (F 10.7 ), which varies with solar cycle, is often taken as an index of solar activity [e.g., Gray et al, 2010;Beig, 2011;Ammosova and Ammosov, 2012;Ammosov et al, 2014;Ramesh et al, 2015]. The daily data of F 10.7 adjusted for an arbitrary unit (1 AU) is used to analyze the response of T-CPM to solar activity.…”

Section: Data Sourcementioning

confidence: 99%

The response of the temperature of cold‐point mesopause to solar activity based on SABER data set

et al. 2016

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The thermal structure and energy balance of upper atmosphere are dominated by solar activity. The response of cold‐point mesopause (CPM) to solar activity is an important form. This article presents the response of the temperature of CPM (T‐CPM) to solar activity using 14 year Sounding of the Atmosphere using Broadband Emission Radiometry data series over 80°S–80°N regions. These regions are divided into 16 latitude zones with 10° interval, and the spatial areas of 80°S–80°N, 180°W–180°E are divided into 96 lattices with 10°(latitude) × 60°(longitude) grid. The annual‐mean values of T‐CPM and F10.7 are calculated. The least squares regression method and correlation analysis are applied to these annual‐mean series. First, the results show that the global T‐CPM is significantly correlated to solar activity at the 0.05 level of significance with correlation coefficient of 0.90. The global solar response of T‐CPM is 4.89 ± 0.67 K/100 solar flux unit. Then, for each latitude zone, the solar response of T‐CPM and its fluctuation are obtained. The solar response of T‐CPM becomes stronger with increasing latitude. The fluctuation ranges of solar response at middle‐latitude regions are smaller than those of the equator and high‐latitude regions, and the global distribution takes on W shape. The corelationship analysis shows that the T‐CPM is significantly correlated to solar activity at the 0.05 level of significance for each latitude zone. The correlation coefficients at middle‐latitude regions are higher than those of the equator and high‐latitude regions, and the global distribution takes on M shape. At last, for each grid cell, the response of T‐CPM to solar activity and their correlation coefficient are presented.

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“…That study only used a very short period of observations which coincided with the maximum of solar activity. Further, Ammosov et al (2014) presented the results of data analysis obtained in a time interval comparable to the solar cycle duration from 1999 to 2013. Analysis showed that the temperature change follows the solar activity change with 25 months' delay.…”

Section: Introductionmentioning

confidence: 99%

Influence of geomagnetic activity on mesopause temperature over Yakutia

Gavrilyeva

Аммосов

2018

Atmos. Chem. Phys.

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Abstract. The long-term temperature changes of the mesopause region at the hydroxyl molecule OH (6-2) nighttime height and its connection with the geomagnetic activity during the 23rd and beginning of the 24th solar cycles are presented. Measurements were conducted with an infrared digital spectrograph at the Maimaga station (63 • N, 129.5 • E). The hydroxyl rotational temperature (TOH) is assumed to be equal to the neutral atmosphere temperature at the altitude of ∼ 87 km. The average temperatures obtained for the period 1999 to 2015 are considered. The season of observations starts at the beginning of August and lasts until the middle of May. The maximum of the seasonally averaged temperatures is delayed by 2 years relative to the maximum of the solar radio emission flux (wavelength of 10.7 cm), and correlates with a change in geomagnetic activity (Ap index). Temperature grouping in accordance with the geomagnetic activity level showed that in years with high activity (Ap > 8), the mesopause temperature from October to February is about 10 K higher than in years with low activity (Ap < = 8). Cross-correlation analysis showed no temporal shift between geomagnetic activity and temperature. The correlation coefficient is equal to 0.51 at the 95 % level.

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Response of the mesopause temperatures to solar activity over Yakutia in 1999–2013

Cited by 25 publications

References 25 publications

Updated Long‐Term Trends in Mesopause Temperature, Airglow Emissions, and Noctilucent Clouds

Updated Long‐Term Trends in Mesopause Temperature, Airglow Emissions, and Noctilucent Clouds

The response of the temperature of cold‐point mesopause to solar activity based on SABER data set

Influence of geomagnetic activity on mesopause temperature over Yakutia

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