نتایج جستجو برای: upper atmosphere
تعداد نتایج: 256100 فیلتر نتایج به سال:
The first measurements of a heavy oxygen isotope in Earth’s upper atmosphere suggest that isotopic concentrations could become powerful probes atmospheric processes at otherwise hard-to-probe altitudes.  
Spectroscopic observations at extreme- and far-ultraviolet wavelengths have revealed systematic upflows in the solar transition region corona. These are best seen network structures of quiet Sun coronal holes, boundaries active regions, dimming regions associated with mass ejections. They been intensively studied past two decades because they likely to be closely related formation wind heating ...
Titan is an important endpoint for understanding atmospheric evolution. Prior to Cassini's arrival at Saturn, modelling based on Voyager data indicated that the hydrogen escape rate was large (1-3x1028amus-1), but the escape rates for carbon and nitrogen species were relatively small (5x1026amus-1) and dominated by atmospheric sputtering. Recent analysis of the structure of Titan's thermosphere...
The Cassini Ion Neutral Mass Spectrometer (INMS) has obtained the first in situ composition measurements of the neutral densities of molecular nitrogen, methane, molecular hydrogen, argon, and a host of stable carbon-nitrile compounds in Titan's upper atmosphere. INMS in situ mass spectrometry has also provided evidence for atmospheric waves in the upper atmosphere and the first direct measurem...
This chapter summarizes our current understanding of the upper atmosphere and ionosphere of Saturn. We summarize the available observations and the various relevant models associated with these regions. We describe what is currently known, outline any controversies and indicate how future observations can help in advancing our understanding of the various controlling physical and chemical proce...
This paper considers the large-scale dynamics generated in the upper atmosphere by the destabilization of a linear internal gravity wave and its eventual restabilization through nonlinear processes into a coherent pattern. The assumption of a strongly dissipative medium is relevant to wave propagation in the thermosphere range above 100 km. A parametric instability analysis is carried out invol...
Following the early suggestion of Peltier and Hines [1], it is now generally accepted that tsunamis can excite acoustic-gravity waves, and that these waves can propagate to the upper atmosphere. Because of the decrease of atmospheric density with increasing altitude, conservation of wave energy causes the wave disturbance amplitudes to increase with increasing altitude. At high altitudes molecu...
Observations of sky emission and absorption in the far infrared (mean wavelength 120 /•) and, simultaneously, sky emission at wavelength 6 • have been made by P. Kuhn (ESSA): from the NASA CV-990 aircraft flying at 12-km altitude over the middle Pacific at latitudes 10ø-15øN. A lack of correlation between the nearand far-infrared data, especially during times of visible cirrus cloud cover above...
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