ISR Events

Institute for Scientific Research Seminar: Julia Tilles, UNH

Institute for Scientific Research Seminar: Julia Tilles, UNH

Julia Tilles, University of New Hampshire

Thunderstorm Radio Interferometry on Microsecond Timescales

Though thunderstorms and lightning are commonplace on Earth, it is still unclear how lightning initiates, how exactly it propagates, and how thunderstorms generate bursts of gamma-rays so intense that they can be detected by spacecraft in orbit. While these processes primarily occur deep inside thunderstorms, obscured by thousands of cubic kilometers of cloud water and ice, they cannot be observed directly in optical, but can be observed in radio. High-speed radio interferometry has been developed to map the progression of lightning-associated radio sources with extremely fine (sub-microsecond) temporal resolution, allowing for the investigation of previously unforeseen dynamics. Using a three-element, broadband (20-80 MHz), 16-bit radio interferometer developed by New Mexico Tech and deployed at Kennedy Space Center, FL, we discovered a new form of thunderstorm electrical breakdown termed fast negative breakdown [Tilles et al., doi:10.1038/s41467-019-09621-z]. In this talk, we show how the discovery is at odds with a long-standing theory of lightning initiation involving positive corona streamers.

 

January 30

10:30 AM – 11:30 AM

ISR Conference Room, 202 Kenny Cottle Hall

Contact
Kathleen Kraemer

Institute for Scientific Research Seminar: Shunrong Zhang, MIT/Haystack Observatory

Institute for Scientific Research Seminar: Shunrong Zhang, MIT/Haystack Observatory

 Shunrong Zhang, MIT/Haystack Observatory

March 05

10:30 AM – 11:30 AM

ISR Conference Room, 202 Kenny Cottle Hall

Contact
Kathleen Kraemer

Institute for Scientific Research Seminar: O. Jonah, MIT/Haystack Observatory

Institute for Scientific Research Seminar: O. Jonah, MIT/Haystack Observatory

O. Jonah, MIT/Haystack Observatory

March 26

10:30 AM – 11:30 AM

ISR Conference Room, 202 Kenny Cottle Hall

Contact
Kathleen Kraemer

Institute for Scientific Research Seminar: Mari Paz Miralles, Harvard-Smithsonian CfA

Institute for Scientific Research Seminar: Mari Paz Miralles, Harvard-Smithsonian CfA

Mari Paz Miralles, Harvard-Smithsonian Center for Astrophysics

April 16

10:30 AM – 11:30 AM

ISR Conference Room, 202 Kenny Cottle Hall

Contact
Kathleen Kraemer

Institute for Scientific Research Seminar: Luke Moore, Boston University

Institute for Scientific Research Seminar: Luke Moore, Boston University

Luke Moore, Boston University Center for Space Physics

April 23

10:30 AM – 11:30 AM

ISR Conference Room, 202 Kenny Cottle Hall

Contact
Kathleen Kraemer