Results 121 to 130 of about 1,392 (166)
Accuracy assessment of thermospheric density models
, 2001 An abstract is not available.
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Preliminary results to support evidence of thermospheric contraction
, 2009 Atmospheric density has an important influence in predicting the positions of satellites in low Earth orbit. For long-term predictions of satellite ephemerides, any future density trend in the thermosphere would be a valuable input, not only to satellite
Lewis, H.G., Swinerd, G.G., Saunders, A.
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Long term analysis of thermospheric total mass density
Bu tez çalışmasında termosferik kütle yoğunluğunun uzun dönemli değişimi ile Güneş lekesi sayısı (SSN) arasındaki ilişki gözlemlemiştir. Güneş lekesi sayısı ile 250 km, 275 km, 325 km, 375 km, 400 km, 425 km, 475 km, 525 km, 550 km, 575 km yükseklikleri ...
Yapalı, Seval
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Analysis of the evolution of the density of the lower thermosphere
The warming effect of greenhouse gases at Earth's surface is well established, but this behavior changes with altitude. There is the hypothesis that, instead, in the thermosphere, increasing CO_2 concentrations produce a net cooling, which causes the region to contract and leads to a decrease in density at fixed altitudes.
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Climatology of the equatorial thermospheric mass density anomaly
Climatology of the equatorial thermospheric mass density anomalyThe equatorial anomaly is an interesting and important feature of the Earth's thermosphere-ionosphere coupling in tropical regions. It is an anomalous latitudinal distribution found in both the ionized and unionized part of the atmosphere. Its equinox configuration consists of a minimum near the dip equator flanked by two maxima on both sides.
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Correlations between solar activity and thermospheric density
Chinese Journal of Space Science, 2014 Jun Niu, Hanxian Fang, Libin Weng
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A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar : thermospheric density over Svalbard [PDF]
, 2014 We exploit a recently developed technique, based on ion-neutral coupling, which allows estimations of the upper thermospheric neutral density using measurements of ionospheric plasma parameters made by the European Incoherent Scatter (EISCAT) Svalbard Radar (ESR).
Vickers, H. +5 more
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Journal of Atmospheric and Solar-Terrestrial Physics, 2019 Geomorphologies and mechanisms of thermospheric mass density variations caused by geomagnetic storms are still challenging due to limited observations and imprecise models.
Liangliang Yuan +2 more
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On the annual and semiannual variations of the thermospheric density
Journal of Atmospheric and Terrestrial Physics, 1972Abstract The semiannual density variation is decomposed into Fourier terms to find out the physical nature of this effect. In order to represent the observational data of the ‘semiannual’ effect it is sufficient to take into account the first two harmonics—the annual and the semiannual component.
H Volland, C Wulf-Mathies, W Priester
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Thermospheric densities for the Swarm satellite mission
2021<p>The European Space Agency (ESA) Swarm mission was launched in November 2013 and consists of three identical satellites flying in near-polar orbits. One satellite is flying at about 515 km, while the other two satellites are flying side-by-side at lower altitudes, starting at 480 km altitude and slowly descending due to atmospheric drag
Jose van den IJssel +2 more
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