Results 171 to 180 of about 68,935 (200)

Martian Ionospheric Observation and Modelling

2020
Abstract The Martian ionosphere is a plasma embedded within the neutral upper atmosphere of the planet. Its main source is the ionization of the CO2-dominated Martian mesosphere and thermosphere by energetic EUV solar radiation. The ionosphere of Mars is subject to an important variability induced by changes in its forcing mechanisms (
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The Structure of the Martian Ionosphere

After multiple Martian years and almost one full solar cycle in orbit, measurements from the MAVEN mission can now allow us to study the ionosphere. The statistical structure of the Martian ionosphere is assessed and presented here as a step towards a new empirical Martian Ionospheric Model for electron density and ...
Laila Andersson, Marcin Pilinski, Duncan Bark, Skylar Shaver, Troy Hesse, Sergey Shuvalov, David Andrews   +6 more
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The Martian thermosphere/ionosphere at high and low solar activities

Advances in Space Research, 1996
Abstract We compare here models of the thermosphere/ionosphere of Mars at low and high solar activities, and we present heating rates and efficiencies due to the absorption of solar radiation in the 18 to 2000 A range. Using neutral model densities from the NCAR Mars Thermospheric General Circulation Model (MTGCM) of Bougher and co-workers, and solar
Fox, Jane L., Bougher, Stephen W., Zhou, P.   +2 more
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On the Gravity Wave‐Seeded Ionospheric Irregularities in the Martian Ionosphere

Journal of Geophysical Research: Planets
Abstract For the past few decades, it has been demonstrated that gravity waves (GWs) and neutral winds can drive ionospheric irregularities on Earth. Still, as far as we know, the formation of ionospheric irregularities on Mars due to GWs has not been well studied.
Rong Tian, Chunhua Jiang, Beatriz Sánchez‐Cano, Wenjie Yin, Guobin Yang, Tongxin Liu, Yaogai Hu   +6 more
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Ion-neutral reactions in the martian ionosphere

Planetary and Space Science, 1966
Abstract A number of reactions that might be important in the martian ionosphere have been studied and their rate coefficients have been measured with a pulsed flowing afterglow system. One of the most important of these is O+ + CO2 → O2+ + CO, which has a rate coefficient of about 10−9 cm+3 sec−1.
R.B. Norton, E.E. Ferguson, F.C. Fehsenfeld, A.L. Schmeltekopf   +3 more
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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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Electron impact ionization in the Martian ionosphere

AIP Conference Proceedings, 2007
A number of distinct hot plasma flux tubes are detected in the Martian ionosphere, primarily formed when the magnetospheric plasma is magnetically connected to the upper ionosphere. The electron reflectometer measurements have shown that magnetospheric electrons are sometimes observed not only close to the ionopause, but at low altitudes (
K. Dialynas, G. Babasides, N. Sergis, X. Moussas   +3 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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