Colloquium

Colloquium

  • Friday, December 8, 2017 - 3:10pm to 4:00pm  ·  Colloquium
    Jim Clemmons, Space Science Application Laboratory, The Aerospace Cooperation, El Segundo, CA

    As the so-called “last link” in the electrodynamic chain that connects the Sun to the Earth’s atmosphere, the ionosphere-thermosphere-mesosphere (ITM) system is an important boundary region within the overall system.  Despite earnest study and the development of significant understanding over the last century, many features and substantial portions behavior of the ITM system are just now coming to light.  Motivated by the desire to understand the physics of the system and how it behaves within the larger Sun-Earth system, as well as the significant space weather effects it has on various sp

  • Wednesday, December 6, 2017 - 2:10pm  ·  Colloquium
    Amy Keesee, West Virginia University

    Much of our knowledge of magnetosphere dynamics, especially during space weather events, is based upon single-point measurements along the orbit of a satellite. Such measurements make it a challenge to understand and distinguish spatial and temporal variations in particle populations as well as electric and magnetic fields that occur during geomagnetically active intervals.

  • Monday, December 4, 2017 - 4:10pm  ·  Colloquium
    George C. Ho, The Johns Hopkins University Applied Physics Laboratory

    MESSENGER is a scientific investigation of the planet Mercury.   Understanding Mercury, and the forces that have shaped it, is fundamental to understanding the terrestrial planets and their evolution.

  • Friday, December 1, 2017 - 3:10pm to 4:00pm  ·  Colloquium
    Shawna Hollen, UNH

    Despite our thousands of years of experience developing textiles, we did not expect two-dimensional crystals could exist. And even if they did, what use could a single-atom-thick fabric have? Surely, its properties would be worse than the 3D counterpart. So when a single layer of carbon atoms (graphene) was isolated in 2004—and was stronger than any material ever measured and had electrons that exhibited room-temperature quantum coherence over micrometer distances—it took the world by surprise.

  • Thursday, November 30, 2017 - 12:40pm to 1:30pm  ·  Colloquium
    Harald Kucharek, UNH

    Particle acceleration is one of the most fundamental physical processes in the plasma Universe. The heliosphere is an ideal laboratory for investigating these processes of particle acceleration because one can observe the basic mechanisms in situ. There are no times or conditions under which the so-called suprathermal ions are not present in the solar wind ion distribution.  Ions can be energized up to tens of MeV/nucleon at interplanetary shocks driven by coronal mass ejections (CMEs) and by co-rotating interaction regions (CIRs).

  • Monday, November 20, 2017 - 3:30pm to 4:30pm  ·  Colloquium
    Quintin Schiller, NASA Goddard Space Flight Center, Greenbelt, MD

    Abstract: Traditionally, there has been a massive technical and financial barrier preventing access to near-Earth space.  However, in recent years, CubeSats have greatly reduced the resources required to put hardware into space.  Crowd-sourced payloads, satellites built by elementary schools, and 50 spacecraft constellations are all CubeSat missions that have launched in the past few years.  Instead of asking “can I put something into space?”, you can now realistically ask “what should I put into space?”.  Be careful though; just like airplanes on Earth, weather is importan

  • Friday, November 17, 2017 - 3:10am to 4:00am  ·  Colloquium
    William Brooks, USM Valparaiso, Chile

    QCD, the theory of the strong interaction, has three conserved color charges, just as QED has one conserved electric charge. Due to the QCD property of confinement, these charges are not visible in isolation, but rather are only found in color-neutral combinations, the mesons and baryons. However, color can be briefly liberated in high-energy scattering interactions, and can travel relatively long distances before coalescing back into color-neutral systems.

  • Tuesday, November 7, 2017 - 3:10pm to 4:00pm  ·  Colloquium
    Jiadong Zang, UNH

    Abstract: Topology is an ancient subject in mathematics that was concluded having no relevance to physics. However, recent development of condensed matter physics gives birth to many topological phenomena. In magnetism, topological spin textures are emergent, including domain walls, vortices, and skyrmions. Chiral magnets are such platforms. They are a series of magnets with broken inversion symmetry.

  • Friday, November 3, 2017 - 3:10pm to 4:00pm  ·  Colloquium
    Jim Connell, University of New Hampshire

    High energy (> 1 MeV) particles (ions and electrons) in space are a rich field of study that have many scientific, but also practical, implications.  A continuous source is Galactic cosmic rays.  GCR’s are ions and electrons accelerated in our Galaxy and confined by the Galactic magnetic field, forming a non-thermal gas that diffuses through, but also slowly escapes, the Galaxy.  Another continuous sources are the anomalous cosmic rays, which are believed to be local interstellar gas neutral atoms that becomes ionized in the Solar system and then accelerated at the termination shock.  

  • Friday, October 27, 2017 - 3:10pm to 4:00pm  ·  Colloquium
    David Mattingly, University of New Hampshire

    Quantum gravity, or the merger of general relativity with quantum mechanics, is one of the great unsolved problems in physics.  The difficulties with quantum gravity are conceptual, technical, and experimental:   models for quantum gravity force us to change our very notions of space and time, are often difficult to calculate in, and are very difficult to test.  After a brief introduction to the overall problem of quantum gravity, I will describe some of the progress over the past two decades in developing a useful phenomenology.  I will focus in particular on how experimental tests of spac