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.

Thursday, July 14, 2016 - 10:00am to 11:00am  ·  Space Science Seminar
Farzane Shirazi

Abstract: The objective of the proposed work is investigation of channeling and concentrating soft gamma rays (above 100 keV) using multilayer thin films of alternating low and high-density materials. This will enable future telescopes for higher energies with the same mission parameters already proven by NuSTAR. Based on initial investigations at Los Alamos National Laboratory (LANL) we are investigating producing these multilayers with the required thicknesses, uniformity and smoothness using magnetron sputter (MS) and pulsed laser deposition (PLD) techniques.

Thursday, May 26, 2016 - 3:30pm to 4:30pm  ·  Space Science Seminar
Jerry Goldstein, Southwest Research Institute

Abstract: 

Wednesday, May 25, 2016 - 3:00pm to 4:00pm  ·  Space Science Seminar
Shri Kanekal, NASA Goddard Space Flight Center

Abstract: Since the discovery of the Earth’s radiation belts by James Van Allen in the 1950s, they have been well studied providing a laboratory for understanding charged particle dynamics in the heliosphere and beyond. The Van Allen belts, comprise charged particles trapped in the geomagnetic field, usually confined to two distinct regions, the inner and the outer belt separated by the so-called slot region.

Wednesday, April 27, 2016 - 3:00pm  ·  Space Science Seminar
Dr. Ningyn Liu, Florida Institute of Technlogies

Abstract: Thunderstorms and lightning can produce strong impact on the D region (60-100 km) of the ionosphere. The most impressive display of this impact is the occurrence of transient luminous events such as sprites and halos caused by lightning. Recent studies show that the D region ionospheric density can be briefly increased by many orders of magnitude due to extremely intense lightning. On the other hand, it has also been found that moderate variation of the lower ionosphere on a timescale of minutes to hours is correlated with electrical activity in thunderstorms.