Development of an Advanced Space Weather Warning System: The PreSTIM Laboratory Prototype, 15-9557
Printer Friendly VersionPrincipal Investigators
Frédéric Allegrini
Arik Posner
Dave McComas
Collaborators
Stefano Livi
Nick Paschalidis
Applied Physics Laboratory, Johns Hopkins University
Inclusive Dates: 07/01/05 – Current
Background - Explosions – coronal mass ejections and flares – on the surface of the sun can release large amounts of energy and mass into the interplanetary medium. A fraction of these perturbations will inevitably impact directly on the Earth's magnetosphere. Geospace, the region surrounding our planet with a magnetosphere, is a protective environment that shields the upper atmosphere and low-Earth orbit against the solar wind and energetic particles. Under solar storm conditions, when transient solar activity impacts and transforms the magnetic bubble, the reaction of the Earth's environment is, at times, violent and dangerous. Changing magnetic fields induce currents, and this is also true for the ionosphere (the uppermost layer of the Earth's atmosphere). These currents can interfere with human technology on the Earth's surface and in space. Mainly, the positions of the radiation belts, carefully avoided by human space mission planners, become uncertain and often suddenly interfere with human presence in space. Severe radiation damage to humans and their support systems can result and needs to be avoided. Such severe space weather conditions can only now be forecast well in advance, with the Pre-Shock Suprathermal Ion Monitor (PreSTIM) placed on upcoming space weather monitoring missions. In this research project, we want to bring PreSTIM from the concept level to a fully functional laboratory prototype. The development of the PreSTIM is done in collaboration with the Applied Physics Laboratory (APL) at Johns Hopkins University.
Approach - To achieve our goal, we divided the project in four objectives:
Objective 1. Modeling and optimization of the instrument. For this task we will perform electro-optics simulations with the powerful software Simion. The model of the instrument will include carbon foil effects (energy straggling and angular scattering of the particles). We will also simulate time-of-flight measurements to estimate the mass resolution of this instrument.
Objective 2. Design and fabrication of laboratory prototype. Based on the results of the first objective, we will design and build a laboratory prototype.
Objective 3. Integration of detectors and electronics and tests with ion beam. The detectors will be integrated into the laboratory prototype in a clean area and the tests with ion beam will be carried out in a high vacuum chamber.
Objective 4. Extension of the research on suprathermal ions.
Accomplishments - The instrument model is working. We are using the model to test different design options to determine which option gives the best results in our parameter space. We are also optimizing the electro-optics design. We have started the mechanical design of our laboratory prototype in parallel. PreSTIM is a detector that improves the capabilities for forecasting interplanetary shocks at Earth. A previous study with data from the STICS experiment on the Wind spacecraft has shown that suprathermal foreshock ions provide early warning for incoming shocks. However, this study is essentially limited through usage of data only from the rising phase of the solar cycle. Our intention is to demonstrate that also during other phases of the solar cycle PreSTIM will perform well as a forecasting tool for upcoming space weather missions. We have made substantial progress on data analysis in this regard.
