Results 151 to 160 of about 319 (179)

Transterminator ion flow in the Martian ionosphere

Planetary and Space Science, 2010
Abstract The upper ionospheres of Mars and Venus are permeated by the magnetic fields induced by the solar wind. It is a long-standing question whether these fields can put the dense ionospheric plasma into motion. If so, the transterminator flow of the upper ionosphere could explain a significant part of the ion escape from the planets atmospheres ...
Fränz, M., Dubinin, E., Nielsen, E., Woch, J., Barabash, S., Lundin, R., Fedorov, A.   +6 more
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Effects of dust storms on the Martian ionosphere

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 2019
Dust storms on Mars, particularly the planet-encircling ones, are one of the most dynamic phenomena that substantially alter the temperatures and circulation patterns of the Martian lower atmosphere [1]. Observational and modeling studies have shown that the Martian ionosphere also responds to the lower atmospheric dust storms [2].
V. Leelavathi, N. Venkateswara Rao, P. Mohanamanasa, Ch. Yaswanth, S. V. B. Rao   +4 more
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Electromagnetic Wave Propagation in the Martian Ionosphere

IETE Journal of Research, 1972
The paper deals with some aspects of electromagnetic wave propagation in the Martian ionosphere. Using recent data, the effective collision frequency and high frequency conductivity have been calculated for all the three models, namely F2, F1 and E. The real part of the complex refractive index is then calculated for νeff = 0 and νeff ≠ 0.
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Distortion of radar pulses by the Martian ionosphere

Radio Science, 2003
In spacecraft borne radar investigations of planets such as Venus and Mars the waves must penetrate an ionospheric layer which causes absorption and dispersive phase delay if the waves reach the surface at all. If the purpose of the radar system is to explore the planetary subsurface, the radar frequency should be as low as possible for maximum skin ...
Armand, N., Smirnov, V., Hagfors, T.
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Evidence for topographic effects on the Martian ionosphere

Planetary and Space Science, 2004
Abstract The Radio occultation experiment on board Mariner 9 has been used to demonstrate that the altitude of the main electron density peak in the Martian ionosphere is closely related to the height of Mars’ surface at the occultation point. This is direct evidence for topographic effects on the Martian ionosphere.
Wang, J., Nielsen, E.
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Seasonal Variation of the Martian Dayside Ionosphere

Journal of Geophysical Research: Space Physics
AbstractThe Martian ionosphere has many similarities and differences compared to Earth, attracting significant attention. This paper utilizes radio occultation data from the Mars Global Surveyor (MGS), Mars Atmosphere and Volatile Evolution Mission (MAVEN), and ESA Mars Express mission (MEX), associated with the measurements from Mars Advanced Radar ...
Haibing Ruan
exaly   +2 more sources

The chemistry of protonated species in the martian ionosphere

Icarus, 2015
Abstract The Mars Atmosphere and Volatile Evolution Mission (MAVEN) spacecraft entered orbit around Mars on 22 September 2014. The Neutral Gas Ion Mass Spectrometer (NGIMS) instrument on this spacecraft will measure the ion densities with unprecedented sensitivity of ∼1  cm - 3 above the nominal periapsis altitude ∼150 km.
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Observations of Vertical Reflections from the Topside Martian Ionosphere

Space Science Reviews, 2006
The Martian ionosphere has for the first time been probed by a low frequency topside radio wave sounder experiment (MARSIS) (Gurnett et al., 2005). The density profiles in the Martian ionosphere have for the first time been observed for solar zenith angles less than 48 degrees. The sounder spectrograms typically have a single trace of echoes, which are
Nielsen, E., Zou, H., Gurnett, D., Kirchner, D., Morgan, D., Huff, R., Orosei, R., Safaeinili, A., Plaut, J., Picardi, G.   +9 more
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The Martian Thermosphere/Ionosphere: Ancient and Modern

1999
We review our current understanding of the thermosphere and ionosphere of Mars at high and low solar activities, including density profiles of ions and minor neutral species, their variation with solar activity, and current and escape rates. We then discuss models of the ancient Martian thermosphere, focusing on the era about 2.5 Gyr before present ...
Fox, Jane L., Bougher, Stephen W.
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Models of the Martian Ionosphere

2023
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