A5087305828- Planetary Science and Exploration
- Astro and Planetary Science
- Space Science and Extraterrestrial Life
- Geomagnetism and Paleomagnetism Studies
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Laser-induced spectroscopy and plasma
- Isotope Analysis in Ecology
- Radiation Detection and Scintillator Technologies
- Japanese History and Culture
Boston University
2016-2020
Laboratory for Atmospheric and Space Physics
2018
Abstract Mars lacks a global magnetic field but possesses concentrated regions of crustal that influence the planet's interaction with solar wind and structure Martian ionosphere. In this study we survey 17 months MAVEN Langmuir Probe Waves dayside electron density temperature measurements to how these quantities are affected in strong fields. Above 200 km altitude, find fields feature cooler temperatures enhanced densities compared little or no field. Neutral not significantly affected....
Abstract Previous observations have shown that electron density and temperature in the dayside ionosphere of Mars vary between strongly weakly magnetized regions planet. Here we use data from Neutral Gas Ion Mass Spectrometer (NGIMS) on Atmosphere Volatile EvolutioN (MAVEN) spacecraft to examine whether ion densities ionospheric composition also vary. We find O + , CO above ∼200 km are greater than regions. Fractional abundances species affected. The /O ratio at 300‐km altitude increases...
Abstract Radio occultation electron densities measurements from the Mariner 9 and Viking spacecraft, which orbited Mars in 1970s, have recently become available a digital format. These data are highly complementary to radio density profiles Global Surveyor, were restricted solar zenith angle altitude. We compiled 9, Viking, Surveyor experiments for comparison made by Advanced Radar Subsurface Ionosphere Sounding (MARSIS), topside radar sounder on Express, MARSIS‐based empirical models. find...
Abstract The Viking Orbiter radio occultation experiment acquired vertical profiles of electron density in the ionosphere Mars. As these were not archived, they thought to have been lost. Here, we report recovery and validation complete set high-quality, dayside from Orbiters 1 2. Sixty-nine spanning solar zenith angles 50°–95° deemed acceptable for scientific analysis. Relative widely used Mars Global Surveyor, better sensitivity, higher extent, more global coverage, greater angle coverage....