A5044390612- Astro and Planetary Science
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Space Science and Extraterrestrial Life
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Laser-induced spectroscopy and plasma
- Space Exploration and Technology
- Space Satellite Systems and Control
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Plasma Diagnostics and Applications
- Inertial Sensor and Navigation
- Spacecraft and Cryogenic Technologies
- Earthquake Detection and Analysis
- Space exploration and regulation
- Geology and Paleoclimatology Research
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
Aalto University
2016-2025
Finnish Meteorological Institute
2009-2022
Finland University
2020
South Eastern Finland University of Applied Sciences
2013-2020
Joint Institute for VLBI ERIC
2019
University of Tasmania
2019
University of Helsinki
2009
Helsinki Institute of Physics
2009
Institute of Space and Astronautical Science
2004-2006
University College London
2004-2006
The Analyzer of Space Plasma and Energetic Atoms (ASPERA) on board the Mars Express spacecraft found that solar wind plasma accelerated ionospheric ions may be observed all way down to pericenter 270 kilometers above dayside planetary surface. This is very deep in ionosphere, implying direct exposure martian topside atmosphere forcing. low-altitude penetration energization due irregularities or perturbations, magnetic anomalies at Mars, both.
The Rosetta mission shall accompany comet 67P/Churyumov-Gerasimenko from a heliocentric distance of >3.6 astronomical units through perihelion passage at 1.25 units, spanning low and maximum activity levels. Initially, the solar wind permeates thin atmosphere formed sublimation, until size plasma pressure ionized define its boundaries: A magnetosphere is born. Using Plasma Consortium ion composition analyzer, we trace evolution first detection water ions to when begins repelling (~3.3...
The ESA-JAXA BepiColombo mission will provide simultaneous measurements from two spacecraft, offering an unprecedented opportunity to investigate magnetospheric and exospheric dynamics at Mercury as well their interactions with the solar wind, radiation, interplanetary dust. Many scientific instruments onboard spacecraft be completely, or partially devoted study near-space environment of complex processes that govern it. issues remain unsolved even after MESSENGER ended in 2015. specific...
Charge exchange between solar wind protons and neutral atmospheric atoms is expected to affect the interaction with Mars, but its influences significance have only been touched upon in previous work. Here several features associated charge process Martian upper atmospheres are described. The analysis based on an empirical proton model derived from Phobos 2 observations interacting atomic (H) molecular (H ) hydrogen, oxygen (O) representing minimum maximum conditions. region where largest...
Auroras are caused by accelerated charged particles precipitating along magnetic field lines into a planetary atmosphere, the auroral brightness being roughly proportional to particle energy flux. The Analyzer of Space Plasma and Energetic Atoms experiment on Mars Express spacecraft has made detailed study acceleration processes nightside Mars. We observed electrons ions in deep high-altitude region that map geographically interface/cleft regions associated with martian crustal magnetization...
TandEM was proposed as an L-class (large) mission in response to ESA's Cosmic Vision 2015–2025 Call, and accepted for further studies, with the goal of exploring Titan Enceladus. The concept is perform situ investigations two worlds tied together by location properties, whose remarkable natures have been partly revealed ongoing Cassini–Huygens mission. These bodies still hold mysteries requiring a complete exploration using variety vehicles instruments. ambitious because its targets are most...
Context. The Rosetta spacecraft is escorting comet 67P/Churyumov-Gerasimenko from a heliocentric distance of >3.6 AU, where the activity was low, until perihelion at 1.24 AU. Initially, solar wind permeates thin atmosphere formed sublimation.
One of the primary objectives Rosetta Plasma Consortium, a suite five plasma instruments on-board spacecraft, is to observe formation and evolution interaction regions at comet 67P/Churyumov-Gerasimenko (67P/CG). Observations made between 2015 April 2016 February show that solar wind–cometary boundaries formed around mid-April lasted through early January. At least two were observed, separated by an ion-neutral collisionopause boundary. The inner region was located on nucleus side boundary...
The Martian atmosphere is under the influence of an intense flux precipitating energetic (≲1 keV) hydrogen atoms. In solar wind and in magnetosheath, fast atoms are produced by charge exchange between protons corona. Atmospheric effects thus manifestations direct interaction planetary neutrals. A three‐dimensional Monte Carlo simulation model has been developed to study different atmospheric used calculate altitude profiles energy deposition rates, ion production photon emission rates at...
Abstract. Quasi-neutral hybrid model is a self-consistent modelling approach that includes positively charged particles and an electron fluid. The has received increasing interest in space plasma physics research because it makes possible to study several physical processes are difficult or impossible by fluid models, such as the effects associated with ions’ finite gyroradius, velocity difference between different ion species, non-Maxwellian distribution function. By now quasi-neutral...
The impact of the solar wind protons on surface Mercury is studied by a global hybrid model. In three‐dimensional self‐consistent quasi‐neutral (ions are particles, electrons fluid) model ions can hit planet. response to several conditions analyzing four upstream cases: pure northward interplanetary magnetic field (IMF), southward IMF, Parker spiral and atypically high speed. Three different regions be identified: (1) “auroral” equatorward side open/closed line boundary, (2) “cusp” dayside...