Wine and Cheese Spring 2016: Difference between revisions
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= January 25th = | = January 25th = | ||
== Ilias Cholis == | == Ilias Cholis == | ||
''' | '''Towards a predictive analytic model for the solar modulation of cosmic rays''' <br> | ||
An important factor limiting our ability to understand the production and propagation of cosmic rays pertains to the effects of heliospheric forces, commonly known as solar modulation. The solar wind is capable of generating time and charge-dependent effects on the spectrum and intensity of low energy (~10 GeV) cosmic rays reaching Earth. Previous analytic treatments of solar modulation have utilized the force-field approximation, in which a simple potential is adopted whose amplitude is selected to best fit the cosmic-ray data taken over a given period of time. Making use of recently available cosmic-ray data from the Voyager 1 spacecraft, along with measurements of the heliospheric magnetic field and solar wind, I will show a time, charge and rigidity-dependent model of solar modulation that can be directly compared to data from a variety of cosmic-ray experiments. This is a simple analytic formula that can be easily utilized in a variety of applications, allowing us to better predict the effects of solar modulation and reduce the number of free parameters involved in cosmic ray propagation models. | |||
== Tony Sohn == | == Tony Sohn == | ||
''' | '''HST Proper Motions along Stellar Streams: Constraining Dark Halo Properties of the Milky Way''' <br> | ||
Stellar streams in the Milky Way are unique dynamical tracers of the dark matter halo, and provide strong tests of galaxy formation models. However, lack of proper motion data limits our understanding of stream orbits and dark halo properties. Thanks to the HST's excellent astrometric accuracy, we are now able to obtain high quality proper motions along stellar streams in the Milky Way. In this talk, I will present our results on HST projects for measuring proper motions along two stellar streams in the halo: the Sagittarius Stream and the Orphan Stream. | |||
=February 1st= | =February 1st= | ||
Revision as of 19:40, 20 January 2016
This page records the schedule, titles and abstracts of the JHU/STScI CAS Astrophysics Wine & Cheese Series in Spring 2016.
If not specified otherwise, the talks are a 25-min presentation plus a 5-min Q/A session.
Back to W&C Schedule
January 25th
Ilias Cholis
Towards a predictive analytic model for the solar modulation of cosmic rays
An important factor limiting our ability to understand the production and propagation of cosmic rays pertains to the effects of heliospheric forces, commonly known as solar modulation. The solar wind is capable of generating time and charge-dependent effects on the spectrum and intensity of low energy (~10 GeV) cosmic rays reaching Earth. Previous analytic treatments of solar modulation have utilized the force-field approximation, in which a simple potential is adopted whose amplitude is selected to best fit the cosmic-ray data taken over a given period of time. Making use of recently available cosmic-ray data from the Voyager 1 spacecraft, along with measurements of the heliospheric magnetic field and solar wind, I will show a time, charge and rigidity-dependent model of solar modulation that can be directly compared to data from a variety of cosmic-ray experiments. This is a simple analytic formula that can be easily utilized in a variety of applications, allowing us to better predict the effects of solar modulation and reduce the number of free parameters involved in cosmic ray propagation models.
Tony Sohn
HST Proper Motions along Stellar Streams: Constraining Dark Halo Properties of the Milky Way
Stellar streams in the Milky Way are unique dynamical tracers of the dark matter halo, and provide strong tests of galaxy formation models. However, lack of proper motion data limits our understanding of stream orbits and dark halo properties. Thanks to the HST's excellent astrometric accuracy, we are now able to obtain high quality proper motions along stellar streams in the Milky Way. In this talk, I will present our results on HST projects for measuring proper motions along two stellar streams in the halo: the Sagittarius Stream and the Orphan Stream.
February 1st
Name
Title
Abstract
February 8th
David Hogg
Title
Abstract
February 15th
Name
Title
Abstract
February 22nd
Mubdi Rahman
Title
Abstract
Richard Anderson
Title
Abstract
February 29th
Name
Title
Abstract
March 7th
Nathan Miller
Title
Abstract
Duncan Watts
Title
Abstract
March 15th Spring break
March 21st
Name
Title
Abstract
March 28th
Ravi Sankrit
Title
Abstract
Zhilei Xu
Title
Abstract
April 4th
Name
Title
Abstract
April 11th
Name
Title
Abstract
April 18th
Name
Title
Abstract
April 25th
Name
Title
Abstract
May 2nd
Name
Title
Abstract
