Seasonal variations of thermospheric mass density at dawn/dusk from GOCE observations

Weng, Libin; Lei, Jiuhou; Doornbos, Eelco; Fang, Hanxian; Dou, Xiankang

doi:10.5194/angeo-36-489-2018

Cited by 13 publications

(9 citation statements)

References 30 publications

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“…The year 1977 is chosen for simplicity to show qualitatively that anthropogenic cooling can cause some of the observed discrepancy. Additionally, comparisons of MSIS and GOCE densities at 250 km at the Dawn and Dusk terminators show GOCE measured densities to be ∼20% lower than those of MSIS from 2010 through 2013 (Weng et al., 2018). If absolute calibration differences between GOCE and MSIS are considered negligible, the lower GOCE densities are consistent with a cooler thermosphere than that predicted by MSIS.…”

Section: Discussionmentioning

confidence: 99%

PROBA2 LYRA Occultations: Thermospheric Temperature and Composition, Sensitivity to EUV Forcing, and Comparisons With Mars

Thiemann

Dominique

2021

JGR Space Physics

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The Earth's thermosphere, the upper region of its neutral atmosphere, extends from the temperature minimum at the mesopause (85-100 km;Xu et al., 2007) to geospace. Spanning the regions of both the ionosphere and Low Earth Orbit, the thermosphere and its state have important implications for space weather (Schunk & Sojka, 1996). Photochemical and dynamical processes in the thermosphere change its temperature, density, and composition, directly influencing satellite drag and trans-ionospheric electromagnetic propagation. Geomagnetic storms provide perhaps the most dramatic example of the interplay between the magnetosphere, thermosphere and ionosphere, and the resulting impact on space weather (e.g., Fuller- Rowell et al., 1994;Mayr & Volland, 1973). Currents induced in the magnetosphere cause intense heating in the lower thermosphere, driving an upwelling of N 2 rich air. Satellite drag increases significantly over the poles, resulting in the temporary or even permanent loss of satellite trajectory knowledge. In the ionosphere, the

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Section: Discussionmentioning

confidence: 99%

PROBA2 LYRA Occultations: Thermospheric Temperature and Composition, Sensitivity to EUV Forcing, and Comparisons With Mars

Thiemann

Dominique

2021

JGR Space Physics

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“…The density observations cover the time period from 1 November 2009 to 20 October 2013, and the orbital height varies from 230 to 280 km. To minimize the influence of orbital altitude variation, the GOCE density estimates have been normalized to a fixed altitude of 270 km by using the MSISE00 model (Weng et al, 2018). In this study, version 1.5 data for GOCE accelerometer-derived thermospheric total mass densities are utilized to conduct the density cell analysis.…”

Section: Methodsmentioning

confidence: 99%

Thermospheric Density Cells at High Latitudes as Observed by GOCE Satellite: Preliminary Results

Weng

Lei

Liu

et al. 2019

Geophysical Research Letters

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This study provides a climatological view of density cell structures at high latitudes in the lower thermosphere, using neutral mass density at 270 km derived from Gravity field and steady‐state Ocean Circulation Explorer (GOCE) satellite. Three types of the density cells named isolated low, isolated high, and wavy density cells are analyzed. Our results revealed that the density cell structures generally occur in the Northern Hemisphere and the local summer, but they are less frequently observed in the Southern Hemisphere. The low density cell tends to have greater occurrence in the dawn side than in other sampled local times, while the high and wavy density cells occur more frequently in the morning side in terms of the GOCE trajectory. Moreover, the characteristics of density cell structures, including the central locations, horizontal scales, and relative magnitudes, strongly depend on the type of the density cell structure. These results can serve as a baseline to further validate the theoretical models and also to improve our understanding of the density variability of the lower thermosphere at high latitudes.

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“…They found that density cell structures in the lower thermosphere tend to occur in the local summer and the northern hemisphere, and that their local time distributions, horizontal scales, and relative magnitudes depend on the type of density cell structure. Weng LB et al (2018) further discussed the seasonal variations of lower thermospheric density by using GOCE satellite data and the Empirical Orthogonal Function method. They found that the seasonal density variations show obvious hemispheric asymmetry, with large amplitudes in the southern hemisphere, and that the annual asymmetry and effect of the Sun–Earth distance vary with latitude and solar activity.…”

Section: Ionospheric Dynamics and Couplingsmentioning

confidence: 99%

Recent ionospheric investigations in China (2018–2019)

Liu

Wan

2020

Earth and Planetary Physics

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Key Points:Ionospheric observations have continuously accumulated with increasing GNSS receivers being installed q Studies of ionospheric climatology and space weather highlight new physical understanding q Study of ionospheric irregularities/scintillations reports interesting features q Abstract: Since the release of the 2018 National Report of China on ionospheric research ( Liu LB and Wan WX, 2018) to the Committee on Space Research (COSPAR), scientists from Mainland China have made many new fruitful investigations of various ionospheric-related issues. In this update report, we briefly introduce more than 130 recent reports ( [2018][2019]. The current report covers the following topics: ionospheric space weather, ionospheric structures and climatology, ionospheric dynamics and couplings, ionospheric irregularity and scintillation, modeling and data assimilation, and radio wave propagation in the ionosphere and sounding techniques. ΔV para (m/s) SYM-H (nT) V para (m/s) V para (m/s) ΔV para (m/s) Figure 2. (a) The SYM-H index on 13-17 July 2012. The blue line marks the storm onset (at 06:42 UT on 15 July); yellow and gray areas indicate the 24-hour storm-time and 24-hour quiet-time intervals. (b) The blue dots denote the storm-time equatorial field-aligned plasma drifts observed by C/NOFS with red curve representing median and red lines denoting upper and lower quartile values. (c) Same as panel (b), but for the 24-hour quiet time interval. (d) The difference between (b) and (c). (e-h) Same as panels (a-d), but for the case on 7-11 July 2012 where the 24-hour quiet and storm intervals start at 04:12 UT on 7 and 9 July, respectively, after Zhang R et al. (2018). Earth and Planetary Physics

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Seasonal variations of thermospheric mass density at dawn/dusk from GOCE observations

Cited by 13 publications

References 30 publications

PROBA2 LYRA Occultations: Thermospheric Temperature and Composition, Sensitivity to EUV Forcing, and Comparisons With Mars

PROBA2 LYRA Occultations: Thermospheric Temperature and Composition, Sensitivity to EUV Forcing, and Comparisons With Mars

Thermospheric Density Cells at High Latitudes as Observed by GOCE Satellite: Preliminary Results

Recent ionospheric investigations in China (2018–2019)

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