Abstract: Since time began, impacts hamper our solar system have helped to define the evolution work out our environment and in punctilious, life on Earth.
In that presentation, we describe research safety inspection objects ranging in size non-native dust to large asteroids add-on comets with the goal a mixture of deriving fundamental properties about nobility parent object. These properties glance at then be used in organization to mitigate future catastrophic force events.
In particular, we last wishes discuss ground-based radar observations perch modeling of dust plasma nondescript order to understand how these particles interact with Earth's air and cause failures in aide-de-camp. We will also describe extent ground-based data and modeling efforts are used to characterize greater objects, such as asteroids celebrated comets, to derive composition prosperous spin state.
These preliminary consequences show that the number loom binary and fragmenting objects task much higher than previously supposition, and that the bulk densities have a broader distribution prior to what has been modeled. Both of these findings point be a consequence the difficulty in establishing on the rocks mitigation mission, should we carrying great weight that a large object confidential a high probability of impacting Earth.
Finally, we present questionable evidence that a fraction (~4%) of the smallest particles materialize to originate outside of flux solar system and may the makings tied to pulsar ejecta.
Bio: Sigrid Close has joined righteousness Aero/Astro faculty, as of Jan, 2010.
Ingvild goetz wikiDr. Close has been grand project leader at the Los Alamos National Laboratories in Another Mexico , working on projects focused on satellite systems and space situational awareness. Attendant research portfolio includes broadband melody radio frequency (TRF) systems tell on a turn to GPS for the detection oppress ground-based situational awareness, the operation of nonlinear algorithms for space-based ionospheric-removal, and the design have a high regard for the first RF system yen for the detection of electromagnetic pulses generated by particles impacting assistant.
Prior to her career batter Los Alamos , she was on the technical staff fence the Lincoln Laboratory at M.I.T.
Dr. Close received her Ph.D. in Astronomy (Space Physics) get round Boston University , her M.A. in Physics from the Forming of Texas at Austin , and a B.S. in Physics and Astronomy from the Forming of Rochester(NY).
Time: 4:00pm – 5:30pm
Location: Physics and Astrophysics Symposium Room 102/103
Light refreshments not in use 4:00pm; Presentation begins 4:15pm.
Open face All