[GEM] THE GEM MESSENGER, Volume 28, Number 34

[Newsletter Editor]

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     THE GEM MESSENGER
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Volume 28, Number 34
Aug.03,2018

Announcement submission website: http://aten.igpp.ucla.edu/gem/messenger_form/

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Table of Contents

1. GEM ULF Wave Modeling, Effects, and Applications Focus Group: 2018 Workshop Report

2. New Deadline for Abstracts for the Space Weather Conference of the AMS

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1. GEM ULF Wave Modeling, Effects, and Applications Focus Group: 2018 Workshop Report
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From: Michael Hartinger, Kazue Takahashi, and Brian Kress (mdhartin at vt.edu)

The “Ultra Low Frequency wave Modeling, Effects, and Applications” focus group (UMEA, 2016-2020) seeks to bring researchers together to address broad questions of interest to many GEM FG: What excites ULF waves? How do they couple to the plasmasphere/ring current/radiation belt? What is their role in magnetosphere-ionosphere coupling? 

UMEA held four breakout sessions at the 2018 GEM workshop: two standalone and two joint with other focus groups. Several presentations are now posted on the GEM wiki, along with updates on HGSO coordination for ULF wave studies and the ULF wave modeling challenge.

1. ULF waves during particle injections and dipolarizations: Joint with Dipolarization and Substorm FGs

This session focused on the relationship between particle injections/dipolarizations and ULF waves (e.g., Why are waves driven in only some events? Do waves impact the ring current/radiation belts?). Model and observational results showed that Pi2 wave properties – including the arrival time of Pi2 wave packets at ground stations – are significantly affected by ionospheric conductivity and radial Alfven speed profiles. Incoherent scatter radar observations of large ionospheric electron density and conductivity variations with Pc5 frequency were shown, while SuperDARN radar measurements showed highly localized ionospheric velocity perturbations associated with poloidal ULF waves; more observations are needed to identify the source(s) of the ULF modulation of ionospheric parameters. Numerical simulation (new version of RCM) and theory of buoyancy waves were presented, demonstrating that some nightside Pc5/Pi2 waves may be associated with the buoyancy mode. Finally, theory of the relationship between ULF waves and substorms was discussed, including Alfvenic interactions that can trigger substoms. 

2. Recent advances in ULF wave research

This session included presentations and discussion of recent advances in ULF wave research. Recent modeling advances included the ability to capture Alfven resonances in a realistic 3D MHD waveguide, and a demonstration that theoretical predictions for the occurrence of drift mirror modes agree with inner magnetosphere satellite observations. Recent observational advances include the use of RBSP/ARASE conjunctions to study ULF wave coupling and obtain densities via magnetoseismology. Recent satellite and ground-based observations demonstrate a connection between transient ion foreshock phenomena and ULF wave activity, with spatial scale and location of the transient feature affecting wave properties – some waves may propagate into the magnetotail. Recent RBSP satellite wave and particle measurements suggest that ULF waves can play a role in transporting ultra-relativistic electrons into the inner radiation belt. Finally, recent efforts to sonify ULF waves for citizen science demonstrated the ability to identify long lasting monochromatic wave activity during the recovery phase of storms.

3. EMIC wave generation, propagation, and interactions (Discussion led by Alexander Drozdov and Maria Usanova)

Several talks about EMIC wave observations were presented during this session. The presentations addressed ground based and satellite (Van Allen Probes, MMS, GOES) measurements. The speakers discussed the association of EMIC wave events with ion injections, variation of solar wind dynamic pressure, and other geomagnetic indices. Several case studies of linearly polarized EMIC waves, EMIC wave harmonics and high latitude ELF waves were presented, bringing up new questions about the mechanisms for these waves’ generation. Additionally, it was shown that despite strong correlation between observation of He-band EMIC waves and electron injections, H+ band EMIC waves may have a different generation mechanism. 

The effects of EMIC waves on the electron radiation belts were demonstrated via modeling and observations. It was shown that EMIC waves affect ultra-relativistic electrons causing narrowings of multi-MeV electron pitch angle distribution and dips in phase space density profiles. The results of the long term simulation and reanalysis were improved with EMIC waves being included. Finally, the empirical model of EMIC waves based on the various geomagnetic indices was presented at the end of the session.

4. ULF wave modeling challenge: Joint with Modeling Methods and Validation FG

The ULF wave modeling challenge was discussed, with the focus on globally distributed in situ and ground-based observations, as well as modeling results, during the recently selected 27-28 May 2017 CME storm challenge event. Observational results that can be used as boundary conditions for models included multi-point solar wind observations, global density observations and outputs from the NURD data assimilation model, ionospheric conductivities from PFISR, and particle measurements from ARASE and other spacecraft. Numerous wave observations were presented: multi-point observations (e.g., 4 GOES spacecraft) of monochromatic waves; localized monochromatic ionospheric velocity perturbations observed by SuperDARN; north-south hemisphere asymmetries in ULF wave properties; ducted EMIC waves; ULF modulated ionospheric conductivity, precipitation, VLF waves, and aurora. Global simulation results were also presented, including ionosphere-thermosphere responses to the interplanetary shock, idealized simulations of the radiation belts, and idealized simulations of global magnetospheric ULF wave activity. Discussion of the challenge event and data-model comparisons will continue in telecons, at the 2018 mini-GEM meeting, and at the 2019 GEM workshop.


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2. New Deadline for Abstracts for the Space Weather Conference of the AMS
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From: Richard Behnke (Behnke.richard at yahoo.com)

The deadline for papers to the AMS Space Weather Conference has been given a two week extension. The new deadline is August 15, 2018.

CALL FOR PAPERS DUE AUGUST 15 2018: AMS Space Weather Conference 6-10 January, 2019, Phoenix, AZ

The Sixteenth Conference on Space Weather, sponsored by the American Meteorological Society (AMS), and organized by the AMS Committee on Space Weather, will be held 6-10 January 2019, as part of the 99th AMS Annual Meeting in Phoenix Arizona.  Preliminary programs, registration, hotel, and general information will be posted on the AMS Web site (https://annual.ametsoc.org/2019/) by mid-August 2018.

The theme for the 2019 AMS Annual Meeting is “Understanding and Building Resilience to Extreme Events by Being Interdisciplinary, International, and Inclusive (III).”

Following this theme, the Conference on Space Weather will solicit papers on the following topics:

I. Advances in space weather research and modeling
II. Extreme space weather events throughout the heliosphere
III. National and International Efforts in Space Weather – Growing Global Preparedness
IV. Space Weather Effects on High Flyers  (Joint Session with the 19th Conference on Aviation, Range, and Aerospace Meteorology)
V. Space Weather and Society: Education & Communication
VI. Space weather as we approach solar minimum
VII. Whole Atmosphere Coupling During Extreme Events (Joint Session with the 20th Conference on Middle Atmosphere )

https://annual.ametsoc.org/index.cfm/2019/programs/conferences-and-symposia/16th-conference-on-space-weather/

Please submit your abstract electronically by 15 August 2018 at https://ams.confex.com/ams/2019Annual/webprogrampreliminary/16SPACEWX.html

Students who want to be considered for travel support will be asked to note this when submitting their abstract. The committee will be providing several small travel grants (~$400) to help defray the cost of attending the AMS meeting for a student who submitted an abstract to present at the Space Weather Conference.  Students who wish to apply are required to submit the following documents to either of the program chairs (Richard Behnke or Barbara Thompson) in a single PDF document: a presentation abstract, statement of why they want to attend the meeting, statement of commitment to attend if awarded the travel award, and letter of recommendation from their advisor.

For additional information please contact the program chairpersons, Richard Behnke,  behnke.richard at yahoo.com<mailto:behnke.richard at yahoo.com>, or Barbara J. Thompson, barbara.j.thompson at nasa.gov<mailto:barbara.j.thompson at nasa.gov>.


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