• Wednesday, November 9, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
    Daniel Verscharen, UNH

    Abstract: The solar wind is a magnetized plasma that exhibits turbulent fluctuations on many scales. In addition to the non-compressive Alfvénic component of the turbulence, a compressive component with slow-mode-like polarization is commonly observed. These fluctuations are associated with characteristic spatio-temporal changes in the particle distribution functions. If the amplitude of the turbulent fluctuations is large enough, the moments of the fluctuating distribution functions cross the thresholds for various kinetic micro-instabilities.

  • Wednesday, November 2, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
    Naomi Maruyama, NOAA
  • Wednesday, October 26, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
    Doug Cramer, UNH

    Abstract: Narrow flow bursts in the plasma sheet have been found to be responsible for the majority of plasma injected into the inner magnetosphere. We examine the character and behavior of these flow bursts during geomagnetic storm and quiet times using a global magnetosphere MHD model (OpenGGCM) that is coupled to a kinetic ring current model (Rice Convection Model).

  • Wednesday, October 12, 2016 - 3:30pm to 4:00pm  ·  Space Science Seminar
    Charles Farrugia, UNH

    Abstract: We discuss plasma, magnetic and electric field data for a flux transfer event (FTE) to highlight improvements in our understanding of these transient reconnection signatures resulting from high resolution data. The ~20 s-long, reverse FTE, which occurred south of the geomagnetic equator near dusk, was immersed in super-Alfvenic flow.  We focus on (i) providing the first observations of field line draping of the external field around the flux rope; (ii) motivating the use of non-force free methods in modeling FTE flux ropes. 
     

  • Wednesday, October 12, 2016 - 3:00pm to 3:30pm  ·  Space Science Seminar
    Love Alm, UNH

    Abstract: One major challenge of analyzing MMS data is to put the observation in the right context, linking them to specific parts of the reconnection region. We will examine methods of estimating the satellite's position inside the reconnection region and a methods reconstructing the geometry of the reconnection region.
     

  • Thursday, October 6, 2016 - 2:00pm to 3:00pm  ·  Space Science Seminar
    John Murphy, Ph.D, Sales Director

    Abstract: Silicon Photomultipliers (SiPMs) have become the go-to modern photodetector for an ever-expanding range of scintillation-based systems in medical and security applications. They are now being adopted in many industrial & automotive applications and the High Energy Physics community continues to find new uses for the technology.
     

  • Wednesday, September 28, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
    Roy Torbert and Love Alm

    Abstract: We will discuss two events in detail of dayside, asymmetric reconnection, from Phase 1A of MMS: one with no guide field, and another with appreciable one. Comparisons to Ohm’s Law terms will also be discussed.
     

  • Thursday, September 1, 2016 - 3:30pm to 4:30pm  ·  Space Science Seminar
    Federico Fraschetti, University of Arizona, Tucson, AZ

    Abstract: Collisionless shocks are regarded as the major source of those energetic particles spread over several orders of magnitude in rigidity that are called cosmic-rays. In-situ measurements of interplanetary shocks offer a unique opportunity of probing the process of particle acceleration at the shock, or in the vicinity of the shock, by measuring the particle intensity and the magnetic field.

  • Wednesday, August 17, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
    Michael Hirsch, Boston University Center for Space Physics

    Abstract: A new generation of geospace instruments are pushing beyond prior observational limitations, fueled by technology developments in all sectors over the past decade. These technological advances drive automated long-term high-bandwidth data recording networks for instruments of all types. In particular, we discuss the benefits, challenges, and solution for experiments incorporating high-speed (50+ frames/sec) EMCCD and sCMOS camera networks at 200 GB/hour/camera.

  • Wednesday, August 10, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
    Denny M. Oliveira

    Abstract: Geomagnetic storms have been known to be the cause of upper atmosphere heating and neutral density upwelling since the beginning of the space era. Early Sputnik observations during storm times showed that thermospheric heating was the cause of increase in air drag forces which in turn affected satellite accelerations. In the following years, such observations inspired other LEO (low Earth orbit) missions that were life short due to air drag which in turn gave basis to the development of thermospheric empirical models, e.g., NRLMSIS-00 and Jacchia-(Bowman) models.