Fwd: VERSIM/GEM Journal Club Invitation
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Jonathan
Feb 27, 2026, 6:47:42 AM (4 days ago) Feb 27
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From: Frantisek Nemec <frantis...@gmail.com>
Date: Fri, Feb 27, 2026 at 6:16 AM
Subject: VERSIM/GEM Journal Club Invitation
To:
From: Frantisek Nemec <frantis...@gmail.com>
Date: Fri, Feb 27, 2026 at 6:16 AM
Subject: VERSIM/GEM Journal Club Invitation
To:
Hello everyone,
March is around the corner and with it the third VERSIM/GEM Journal Club seminar of 2026. We are excited to have Lillian Daneshmand from the University of Iowa presenting her ongoing work on modulation mechanisms for chorus waves during pulsating auroras.
The abstract and the Zoom link are provided below. Please notice the time change -- we are starting one hour earlier than the last time! More details about the journal club can be found here: https://aurora.troja.mff.cuni.cz/versim/index_jc.html
We hope to see many of you there!
Best wishes,
Rachel, Mirek, Jodie, Harriet, Yang and Suhail
Date and time: 4th March @ 8am PST / 11am EST / 4pm UTC / 5pm CET
Title: Modulation of VLF Chorus and Its Connections to Pulsating Aurora
Introduction from the Speaker and abstract:
I will be presenting on some ongoing work regarding a conjunction study between the Van Allen Probes and the THEMIS All-Sky Imagers. This study focuses on the modulation mechanisms for chorus waves during pulsating aurora events.
Pulsating aurora has been shown in previous studies to be produced by time-varying precipitation of high energy electrons caused by quasi-periodic lower-band chorus waves in the equatorial magnetosphere. Additional studies have posited that chorus wave modulation may be driven by interactions between ULF waves and the background plasma through density fluctuations or other mechanisms. Using in situ wave and particle data from the Van Allen Probes, this work studies the relationship between ULF waves and chorus modulation to provide a clearer picture of how chorus waves are generated and modulated in the magnetosphere. Typically, one would expect the chorus modulation frequency to be equal to the frequency of the ULF waves; however, this work has found events where the chorus modulation frequency is twice the ULF wave frequency. Additionally, concurrent observations of pulsating aurora from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) all-sky imagers during conjunctions with the Van Allen Probes are used to correlate the frequency of chorus wave modulations as well as particle flux with pulsating aurora intensity.
Pulsating aurora has been shown in previous studies to be produced by time-varying precipitation of high energy electrons caused by quasi-periodic lower-band chorus waves in the equatorial magnetosphere. Additional studies have posited that chorus wave modulation may be driven by interactions between ULF waves and the background plasma through density fluctuations or other mechanisms. Using in situ wave and particle data from the Van Allen Probes, this work studies the relationship between ULF waves and chorus modulation to provide a clearer picture of how chorus waves are generated and modulated in the magnetosphere. Typically, one would expect the chorus modulation frequency to be equal to the frequency of the ULF waves; however, this work has found events where the chorus modulation frequency is twice the ULF wave frequency. Additionally, concurrent observations of pulsating aurora from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) all-sky imagers during conjunctions with the Van Allen Probes are used to correlate the frequency of chorus wave modulations as well as particle flux with pulsating aurora intensity.
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