- Weekly Seminar - Isaac Held
- Special Seminar - Bhavya Lal
- Weekly Seminar - Ashley Payne
- Special Seminar - Scott Gleason
- Weekly Seminar - Aaron Ridley, Mike Liemohn, and Justin Kasper
- Special Seminar - Elena Adams
- Weekly Seminar - Natalia Ganjushkina
Weekly Seminar - Isaac Held
October 6, 2016 - 3:30 pm
Title: "Tropical cyclones and global climate models"
Special Seminar - Bhavya Lal
October 12, 2016 - 1:30 pm
Title: "The Challenge of Orbital Debris for CubeSats"
Abstract: Because CubeSats typically are not maneuverable, they are seen as orbital debris threats, especially in near Earth orbits, with low Earth orbit being a special challenge because of the presence of the International Space Station. While CubeSats to-date have not caused any damage, as their number grows, so may the risk of a CubeSat conjunction or collision. The scientific community has an opportunity to avoid potential future problems by continuing to proactively engage and seek both policy- and technology-based solutions to the emerging challenge.
Dr. Bhavya Lal, a researcher at the Washington DC based Federally Funded Research and Development Center Science and Technology Policy Institute (STPI), and a member of the National Academy of Sciences (NAS) ad hoc Committee that wrote the report Achieving Science with CubeSats: Thinking Inside the Box (chair: Thomas H Zurbuchen), discusses issues related to CubeSat orbital debris and what may need to be done, especially from a policy perspective, to address the challenge.
Weekly Seminar - Ashley Payne
October 13, 2016 - 3:30 pm
Title: "Atmospheric rivers over the North Pacific basin"
Abstract: Atmospheric rivers are globally-occurring, filamentary features that play a leading role in the poleward transport of atmospheric moisture and in the redistribution of heat from the tropics. They are often a major source of extreme precipitation and flooding when they cross over land. These flooding events have severe socio-economic consequences, particularly in the densely populated western coastline of North America. A growing observational network along the coastline in this region has advanced our understanding of the characteristics of landfalling events, but our ability to forecast their impacts still needs improvement. An investigation of the large-scale mechanisms influencing atmospheric river behavior prior to landfall is essential to improving the ability to forecast hydrologically significant landfalling events.
The focus of this talk is the characterization of the large-scale features associated with the most intense and most persistent landfalling atmospheric river events along the western coastline of North America. An approach for atmospheric river identification, the upper-level features that are characteristic of intense and persistent events, and a summary of the broader implications of this research in relation to climate change will be presented.close
Special Seminar - Scott Gleason
October 14, 2016 - 1:30 pm
Title: "Understanding the Dynamic Earth: Using Signals of Opportunity to Observe Our Changing Planet"
Abstract: This presentation will give an overview of the different types of remote sensing possible with signals of opportunity, then more detailed descriptions of Global Navigation Satellite System (GNSS) based remote sensing from ground and space platforms. This will be followed by examples of spaceborne Earth sensing applications of GNSS reflections, including ocean, land and sea ice sensing. A case will be made that upcoming and future GNSS remote sensing missions, including CYGNSS and others, are well suited to observe the quickly changing Earth environment. The unique ability of GNSS remote sensing satellites to be launched in constellations, at relatively low cost, will enable global Earth observations at revisit times much quicker than existing satellites can achieve. These high temporal observations have the potential to open up new fields of Earth science and allow observation of highly dynamic Earth processes. The presentation will conclude with an overview of the potential Earth monitoring coverage, revisit times and science applications achievable with current and future GNSS constellations.
Scott Gleason is a Principal Scientist at the Southwest Research Institute. He is a Co-Investigator on the science team and Instrument Scientist for the NASA CYGNSS mission. He received his B.S. from the State University of New York at Buffalo, an M.S. from Stanford University and a Ph.D. from the University of Surrey in England. His research is focused on Earth science applications of remote sensing with GNSS signals, including studying the ocean, land processes and the cryosphere. He has previously worked at NASA's Goddard Space Flight Center, Stanford's GPS Laboratory, Surrey Satellite Technology Limited (U.K.), Concordia University (Canada) and the National Oceanography Centre, Southampton (U.K.).
Pizza will be provided!
Weekly Seminar - Aaron Ridley, Mike Liemohn, and Justin Kasper
October 20, 2016 - 3:30 pm
Title: “Three Explorer Proposals from CLaSP”
Abstract: CLaSP faculty members Aaron Ridley, Mike Liemohn, and Justin Kasper recently submitted proposals for instruments and missions to the NASA Explorer opportunity. Come and hear what each has been working on for the past year as they take turns giving their first 15-minute pitches for these exciting missions!close
Special Seminar - Elena Adams
October 21, 2016 - 3:30 pm
Title: "Hodgepodge of Space Missions at the Applied Physics Laboratory"
Abstract: The seminar will cover a variety of flight missions and concept studies that I was lucky enough to be involved in to date at the Applied Physics Laboratory (e.g. the Van Allen Probes, Europa, and the Solar Probe Plus mission). We will discuss the hopping lander POGO that is currently being space qualified. We will end on the current NOAA study that explores what NOAA’s space assets are going to look like from 2030 to 2050. I’ll also sprinkle in some lessons learned on getting the most out of the CLASP degree(s).
Weekly Seminar - Natalia Ganjushkina
October 27, 2016 - 3:30 pm
Title: "KeV electrons in the Earth's inner magnetosphere"
Abstract: About 1000 operational satellites are in Earth orbit and all of them traverse the variable radiation environment in the magnetosphere. One of the primary constituents of the radiation environment are 1-200 keV electrons which pose a serious risk for satellites in the form of surface charging. The keV electron flux varies on the scale of minutes or shorter, being sensitive to current activity levels. Most satellite anomalies due to surface charging occur on the nightside and in the early dawn regions, collocated with the most probable region for substorm injections. When an anomaly occurs, the radiation environment may be more extreme than that given by the specification models used for design. However, data may not be available at the location of the satellite to fully determine the cause of the anomaly. Therefore, there is a need for physical models with the correct dynamical behavior that can be used to reconstruct the radiation environment. To determine the impact of an extreme space weather event on satellites, we need to define the space radiation environment for different orbits. This can be done by using a combination of physical models and in-situ observations. Recent advances in observations and modeling of keV electrons in the Earth's inner magnetosphere will be presented.close