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Testing the Nature of Meteor Radio Afterglows

Thursday May 10, 2018
2:00 pm

 Presenter:  Savin Varghese
 Series:  Center for Astrophysics Research and Technologies Seminar Series
 Abstract:  Meteors occur when high velocity, solid material collides with earth's atmosphere, ablates, and ionizes forming a plasma trail. The recent discovery of high frequency (HF; 3-30 MHz) and very high frequency (VHF; 30-300 MHz) radio emission from meteors in 2014 has opened a new window to study meteor physics. The radio emission from meteors was detected at frequencies below 60 MHz using the all-sky imager of the first station of the Long Wavelength Array (LWA1). Follow-up observations revealed that the emission is broadband, has a power law dependence on frequency and typically last for 10-300 seconds.

In this work, we use the newly commissioned LWA -SV station (Sevilleta National Wild Refuge) along with LWA 1 to carry out coordinated observations which will probe the emission mechanism. The combined all-sky observations from LWA1 and LWA-SV have already detected co-observed meteor radio afterglows. The presence of false positives from RFI and scintillation of bright radio sources make the detection of meteor afterglows a difficult process. We triangulate the transients seen at both stations to eliminate false positives and to identify radio afterglows. In this talk, I will focus on how co-observed meteor radio afterglows are used to understand the nature of radio emission by addressing whether they are isotropic or not.
 Host:  Gregory Taylor
 Location:  Room 190, Physics & Astronomy

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