A5060107101- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Distributed and Parallel Computing Systems
- Advanced Database Systems and Queries
- Scientific Computing and Data Management
- Astronomical Observations and Instrumentation
- Geochemistry and Elemental Analysis
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Data Visualization and Analytics
- Astronomy and Astrophysical Research
- Geology and Paleoclimatology Research
- Spacecraft Design and Technology
- Reservoir Engineering and Simulation Methods
- Spacecraft and Cryogenic Technologies
Johns Hopkins University Applied Physics Laboratory
2010-2021
Johns Hopkins University
1985
We present new polarimetric radar data for the surface of north pole Moon acquired with Mini‐SAR experiment onboard India's Chandrayaan‐1 spacecraft. Between mid‐February and mid‐April, 2009, mapped more than 95% areas polewards 80° latitude at a resolution 150 meters. The polar region displays backscatter properties typical Moon, circular polarization ratio (CPR) values in range 0.1–0.3, increasing to over 1.0 young primary impact craters. These higher CPR likely reflect roughness...
[1] We use detailed multispacecraft observations to study the interaction of an interplanetary (IP) shock with bow Earth on August 9–10, 1998. can distinguish four different phases particle acceleration in shock-shock interaction: (1) formation magnetic contact IP and seed population energetic particles accelerated by it, (2) reacceleration this shock, (3) first order Fermi as two shocks approach each other, (4) release collide. Such a analysis was made possible particularly advantageous...
Abstract Suprathermal (87–212 keV/e) singly charged iron, Fe + , has been discovered in and near Earth's ~9–30 R E equatorial magnetosphere using ~21 years of Geotail STICS (suprathermal ion composition spectrometer) data. Its detection is enhanced during higher geomagnetic solar activity levels. rare compared to dominant suprathermal wind ionospheric origin heavy ions, might derive from one or all three candidate lower‐energy sources: (a) outflow escaped layers ~100 km altitude, (b) charge...
We investigate the spatial distribution, solar‐terrestrial correlation, and basic statistics of a long sequence plasma regime identifications through probability observation P at downtail distances ∼30 < x agsm 210 R E , in an aberrated GSM coordinate system. The data are from Geotail spacecraft measurements obtained October 1992 1994. Earth's local environment has been classified into five principal regimes: PS, sheet, LB, lobe (vacuum lobe, with only trace content), BL, magnetospheric...
We compare the long-term suprathermal heavy ion composition measured at three planets using functionally identical charge-energy-mass spectrometers, one on Geotail, orbiting Earth ~9-30 Re, other Cassini, in interplanetary space, during Jupiter flyby, and then orbit around Saturn. O+, a principal (~80-220 keV/e) each magnetosphere, derives primarily from outflowing ionospheric O+ Earth, but mostly satellites rings Comparable amounts of Iogenic S+ are present Jupiter. Ions escaping...
Cassini project management uses a Distributed Operations concept to create commands for the spacecraft and instruments monitor command execution. In this environment, geographically distributed instrument operations teams schedules. A small team needs an efficient process, set of tools that support translate science objectives into schedules achieve those objectives. Our approach entailed creating automated process pipeline. One tool determines proper state gathering health maintenance....
The CCE Science Data Center at Johns Hopkins University Applied Physics Laboratory is a facility that supplies the computing needs of United States science investigators in their support AMPTE mission. This well-focused purpose has given uniqueness and special characteristics design, implementation, operations.
Earth and Space Science Open Archive posterOpen AccessYou are viewing an older version [v2]Go to new versionEnergetic Fe Ions In And Near The Magnetospheres Of Earth, Jupiter, SaturnAuthorsStephenChristoniDDouglasHamiltoniDJohnPlaneiDDonaldMitchelliDWaltherSpjeldvikiDVictoriaFranklandiDStuartNylundiDSee all authors Stephen ChristoniDCorresponding Author• Submitting AuthorFocused Analysis ResearchiDhttps://orcid.org/0000-0003-1770-2458view email addressThe was not providedcopy addressDouglas...
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v3]Energetic Fe Ions In And Near The Magnetospheres Of Earth, Jupiter, SaturnAuthorsStephenChristoniDDouglasHamiltoniDJohnPlaneiDDonaldMitchelliDWaltherSpjeldvikiDVictoriaFranklandiDStuartNylundiDSee all authors Stephen ChristoniDCorresponding Author• Submitting AuthorFocused Analysis ResearchiDhttps://orcid.org/0000-0003-1770-2458view email addressThe was not providedcopy addressDouglas...
Earth and Space Science Open Archive posterOpen AccessYou are viewing an older version [v1]Go to new versionEnergetic Fe Ions In And Near The Magnetospheres Of Earth, Jupiter, SaturnAuthorsStephenChristoniDDouglasHamiltoniDJohnPlaneiDDonaldMitchelliDWaltherSpjeldvikiDVictoriaFranklandiDStuartNylundiDSee all authors Stephen ChristoniDCorresponding Author• Submitting AuthorFocused Analysis ResearchiDhttps://orcid.org/0000-0003-1770-2458view email addressThe was not providedcopy addressDouglas...