FG: ULF Wave Modeling, Effects, and Applications

Focus Group Leaders:

• Michael Hartinger, Virginia Tech (mdhartin@vt.edu)
• Kazue Takahashi, Applied Physics Laboratory
• Brian Kress, University of Colorado and NOAA-NCEI

Focus Group term: 2016-2020

Science Questions

Our group aims to address the following broad science questions: What mechanisms excite ULF waves? How do ULF waves couple to the plasmasphere/ring current/radiation belt populations? What is the role of ULF waves in Magnetosphere-Ionosphere coupling?

Focus Group Proposal

ULF Wave Modeling, Effects, and Applications (UMEA) (December 2015)

ULF wave modeling challenge

One part of the ULF wave modeling challenge involves running several global MHD simulation codes with identical, idealized solar wind driving conditions (sinusoidal density variation), then comparing the resulting global ULF wave properties and discussing differences in the context of differing boundary conditions, grids, etc. More details can be found here: ULF wave modeling challenge at CCMC

Another part of the ULF wave modeling challenge involves data-model comparisons during specific events. At the 2017 GEM and mini-GEM meetings several challenge events were proposed, including two 2017 events.

We have selected the 27-28 May 2017 storm event for the ULF wave modeling challenge due to favorable solar wind coverage and availability of numerous satellites (MMS, ARASE, THEMIS, RBSP, Cluster, GOES, ...) and ground-based observations for global context and multi-point wave observations. We will be continuously updating this overview presentation with observation and modeling results. Model output and observations for the challenge event - including global densities from the NURD model - can be obtained here. If you would like to add additional observations/model output to the google drive or overview pdf, please contact the co-chairs.

ULF wave HGSO event coordination

Our group is helping coordinate analysis of conjunction events for ULF wave studies, including requesting instrument operation modes favorable for ULF wave analysis.

The 2 May 2017 0400-0800 UT conjunction event includes several satellites (THEMIS, Cluster, Van Allen Probes, GOES, Geotail, FIREBIRD, METOP, POES, DMSP) in the pre-midnight sector during a conjunction with the Poker Flat Incoherent Scatter Radar and several SuperDARN radars. PFISR was operating throughout the conjunction, several SuperDARN radars were in high resolution sampling modes, and several satellites were operating in fast survey/burst mode. The conjunction is favorable for modeling and observation studies of magnetosphere-ionosphere coupling via ULF waves, wave-particle interactions, global ULF wave properties, and many other topics. This pdf summarizes preliminary results

Several web-based tools are available for identifying future conjunctions, including upcoming conjunctions between ARASE and Van Allen Probes/ground and conjunctions between SWARM/all-sky cameras.

There are also many specialized, web-based tools for ULF wave analysis (please contact FG co-chairs to add to this list):

• SuperMAG ground-based magnetometer global ULF wave plots

• CARISMA ground-based magnetometer Pc1 power spectra and Pc5 power spectra

• Augsburg College/UNH Arctic and Antarctic search coil magnetometer survey plots

• Augsburg College (hosted by ViRBO) ULF wave index

• SuperDARN wave analysis and identification of high time-resolution SuperDARN beams

• THEMIS satellite fluxgate magnetometer wave survey plots

• National Institute of Polar Research inter-hemispheric comparisons of Syowa/Iceland induction magnetometer spectra

• Inter-hemispheric comparisons during satellite conjunctions with Arctic(DTU Space)/Antarctic(Virginia Tech) magnetometers

• Meridian Scanning Photometer plots from UNIS/Kjell Henrik Observatory, for context on open-closed boundary and ULF modulation of the aurora

Summary Reports for GEM workshops

2016 UMEA FG report

2017 UMEA FG report

2018 UMEA FG report

2016 Mini-GEM schedule

UMEA will hold one session at the mini-GEM workshop: ULF wave modeling, effects and applications updates

Time: 12:00-13:30, Sunday, December 11, 2016

Location: Oregon Room, Holiday Inn Golden Gateway

Schedule:

First Half (12:00 – 12:45): 3 talks (~15 min each):

• 1. Mike Hartinger -- Overview of UMEA current activities, discussion of future plans

• 2. Lutz Rastaetter -- ULF wave modeling challenge at CCMC

• 3. Robert Rankin -- Modeling the global properties and ground-based signatures of ULF waves and wave-particle interactions

Second Half (12:45 – 13:30): (5 minutes each, 1-2 slides, order of talks may change):

• 1. Xueling Shi -- SuperDARN THEMIS Mode Data Tracker & ULF Wave Detection

• 2. Richard Denton -- Mass density inferred from Alfven wave frequencies measured by RBSP

• 3. Lars Daldorff -- ULF waves, particle transport and energization in global MHD simulations with plasmasphere

• 4. Alexander Drozdov -- Dependence of radiation belt simulations to assumed radial diffusion rates tested for two empirical models of radial transport

• 5. Bob Lysak -- Quarter Wavelength Modes

• 6. Walk-ins

2017 GEM meeting schedule

UMEA will hold four sessions session at the 2017 GEM meeting

UMEA Update and plans, general discussion of ULF wave modeling and observations: 10:30-12:15, Monday, June 19, Port VI-VIII

• 1. Michael Hartinger -- UMEA update

• 2. Toshi Nishimura -- PFISR measurements during the 2 May 2017 HGSO event

• 3. Xueling Shi -- A Survey of Ionospheric ULF Wave Signatures in SuperDARN Data: Occurrence Statistics and Driving Mechanisms

• 4. Tetsuo Motoba -- Dayside Auroral Pulsations

• 5. Brian Kress and Rob Redmon -- Newly Available GOES 8-16 Particle and Magnetic Field Measurements

• 6. Dick Wolf -- Theory of magnetospheric buoyancy waves

ULF wave interactions with the radiation belt and ring current populations: 1:30-3:00, Monday, June 19, Port VI-VIII

• 1. Rualdo Soto-Chavez -- Generation of Pc5-ULF wave by the drift-mirror instability

• 2. Zhiyang Xia -- Eigenmode analysis of compressional poloidal modes in a self-consistent magnetic field

• 3. Mark Engebretson -- Statistical study of the upper frequency cutoff of helium band EMIC waves observed by the Van Allen Probes

• 4. Alexander Drozdov -- Radial diffusion and EMIC waves in the long-term simulation and in the case study

• 5. Seth Claudepierre -- Global MHD simulations driven by idealized Alfvenic fluctuations in the solar wind

• 6. Michael Hartinger -- Radiation belt response to large scale, monochromatic ULF waves: LANL-GEO observations

ULF wave modeling, including CCMC modeling challenge, Joint with MMV: 3:30-5:00, Monday, June 19, Port VI-VIII

• 1. Lutz Rastaetter -- CCMC ULF wave modeling challenge update and challenge events

• 2. Scot Elkington -- ULF wave activity and diffusion coefficients during QARBM challenge events, Ashar F. Ali’s write-up on Event-Specific Radial Diffusion Coefficients Derived Using RBSP EMFISIS and EFW Data

• 3. Katariina Nykyri -- KHI challenge events

• 4. All -- Open Discussion of Challenge Events

• 5. Doga Ozturk -- Effects of Increased Solar Wind Dynamic Pressure on the Coupled M-I system under different IMF By

• 6. Kazue Takahashi -- Cavity mode Van Allen Probe observations

• 7. Bob Lysak -- Cavity mode models

• 8. Tom Elsden -- The Theoretical Foundation of 3D Alfven Resonances: Time Dependent Solutions

Magnetosphere-Ionosphere coupling processes associated with localized disturbances caused by dayside kinetic phenomena: Joint with “Dayside Kinetic Processes…” and “Testing proposed links…”: 3:30-5:00, Tuesday, June 20, Port VI-VIII

• 1. Peter Chi -- Magnetospheric and ionospheric responses to a localized disturbance: The macroscopic view

• 2. Hui Zhang -- Magnetospheric ULF waves generated by foreshock transients

• 3. Hui Zhang -- Modeling challenges in simulating HFA geoeffects

• 4. Boyi Wang -- Optical signatures of dayside ULF waves during magnetosheath high-speed jets

• 5. Katariina Nykyri -- The effect of magnetosheath seed spectrum on KH evolution and associated mass transport

• 6. Kyle Murphy -- A statistical study of discrete ULF wave power observed by GOES

2017 Mini-GEM schedule

UMEA will hold two sessions at the 2017 mini-GEM workshop

Time: 12:00-13:30, Sunday, December 10, 2017, Canal/50

ULF wave modeling challenges Discussion of final plans for the CCMC ULF wave modeling challenge with idealized drivers, as well as open discussion of new challenges involving data-model and model-model comparisons during specific events. Please come with 1-2 slides showing examples of such comparisons, ideas for improving ULF wave models, and/or ideas for specific modeling challenges/sessions relevant to the FG science questions.

• 1. 12:00-12:30 Overview of CCMC ULF wave modeling challenge with idealized driving conditions, description of challenge events and targets proposed during 2017 GEM meeting and November modeling telecon (Michael Hartinger, Lutz Rastaetter)
• 2. 12:30-13:30 Open discussion of challenge events and targets (Allison Jaynes, Robert Rankin), select challenge event to be analyzed at 2018 GEM

Time: 13:50-15:20, Sunday, December 10, 2017, Canal/50

Heliophysics/Geospace system observatory coordination for ULF wave studies Discussion of HGSO coordination for ULF wave studies. This includes updates on the 2 May 2017 conjunction event followed by an open discussion of conjunctions and datasets that are particularly useful for ULF wave studies, including upcoming RBSP-ERG-ground conjunctions. Please come with 1-2 slides showing examples of datasets and past/upcoming conjunctions ideal for addressing the FG science questions: What excites ULF waves? How do ULF waves couple to the plasmasphere/ring current/radiation belt populations? What is the role of ULF waves in MI coupling? We welcome discussion from both modelers and observers of the types of conjunctions and observations that are most needed to address these questions.

• 1. 13:50-14:20 Recently available datasets and conjunctions for ULF wave studies (Chih-Ping Wang, Xueling Shi, Sana Qamar, Rob Redmon)
• 2. 14:20-14:35 Updates on 2 May 2017 conjunction event (Toshi Nishimura, Michael Hartinger)
• 3. 14:35-15:20 Upcoming ARASE-RBSP conjunctions (Yoshi Miyoshi), Open Discussion of HGSO coordination for ULF wave studies (Toshi Nishimura, Kazue Takahashi)

2018 GEM meeting schedule

UMEA will hold four sessions at the 2018 GEM meeting.

ULF waves during particle injections and dipolarizations, joint with Dipolarization and Substorm FG: 10:30-12:00, Monday, June 18

• 1. Discussion of Session Topic

• 2. Bob Lysak -- Ionospheric Conductivity Effects on Pi2 Pulsations

• 3. Mike Hartinger -- Pi2 waves during an extended period with stable plasmapause location and variable geomagnetic activity

• 4. Toshi Nishimura -- Ionosphere observations of Pc5 ULF waves during 2018 HGSO conjunctions

• 5. Xueling Shi -- Long-lasting poloidal ULF waves observed by multiple satellite and SuperDARN HF radars

• 6. Jian Yang -- New RCM-I simulation results for buoyancy waves

• 7. Dick Wolf -- Theory of Buoyancy Waves

• 8. Yan Song -- What Causes the Substorm Expansion Phase and Associated ULF Waves?

Recent advances in ULF wave research: 1:30-3:00, Monday, June 18

• 1. Overview of focus group goals and recent progress

• 2. Brief ULF wave poster overviews (Tuesday posters)

• 3. Kazue Takahashi -- Observation of nightside ULF waves by RBSP and Arase

• 4. Tom Elsden -- Broadband Excitation of 3D Alfven Resonances (FLRs) in an MHD Waveguide

• 5. Boyi Wang -- 2-D structure of foreshock driven Pc5 ULF waves observed by the THEMIS satellites and South Pole imager

• 6. Xiaochen Shen -- Foreshock transient-driven ultra-low frequency (ULF) waves with dawn-dusk asymmetry of wave power

• 7. Chih-Ping Wang -- ULF waves possibly driven by tailward propagation of foreshock perturbations

• 8. Allison Jaynes -- Fast diffusion of ultra-relativistic electrons in the outer radiation belt: 17 March 2015 storm event

• 9. Rualdo Soto -- The Drift-Mirror instability in Earth's inner magnetosphere

• 10. Martin Archer/Mike Hartinger -- Results from Sonification and Citizen Science of Magnetospheric ULF waves

EMIC wave generation, propagation, and interactions: 3:30-5:00, Monday, June 18 (discussion leaders: Alexander Drozdov and Maria Usanova) Session Summary

• 1. Dedong Wang -- EMIC wave observations from Van Allen Probes and MMS

• 2. Mark Engebretson -- Van Allen Probes, and ground based magnetometer observations of EMIC waves associated with a modest interplanetary shock

• 3. Maria Usanova -- MMS Observations of Harmonic Electromagnetic Cyclotron Waves

• 4. Naritoshi Kitamura -- Direct measurements of energy transfer from hot H+ to EMIC waves by MMS

• 5. Bruce Fritz -- ELF Whistler Dependence on a Sunlit Ionosphere

• 6. Chae-Woo Jun -- EMIC waves associated with/without the injection inside/outside the plasmapause

• 7. Hyomin Kim -- Injection-associated EMIC waves

• 8. Sebastian Cervantes -- EMIC wave parameterization in radiation belt reanalysis

• 9. Maria Usanova -- Long-term correlation of EMIC wave activity and radiation belt flux variations

• 10. Alexander Drozdov -- The effects due to the EMIC waves in the VERB code modeling

ULF wave modeling challenge, joint with MMV FG: 3:30-5:00, Wednesday, June 20

• 1. Brief ULF wave poster overviews (Thursday posters)

• 2. Mike Hartinger: ULF wave modeling challenge event overview, discussion of challenge targets (continuing during session)

• 3. Mariko Teramoto: ARASE ULF wave observations during challenge event

• 4. Sam Califf: GOES-14 and 16 observations during the ULF wave challenge event, Data Discussion

• 5. Toshi Nishimura: PFISR measurements of the 27-28 May 2017 ULF waves

• 6. Dogacan Su Ozturk: The modeling study of the 27 March 2017 Event

• 7. Xiaochen Shen: GEM Challenge Event: ULF wave-related electron and proton precipitation/negative dynamic pressure pulse driven EMIC wave

• 8. Tetsuo Motoba: Auroral measurements of the 27-28 May 2017 ULF waves

• 9. Others discuss when their figures/summary plots in event overview pdf are presented…

2018 Mini-GEM schedule

UMEA will hold two sessions at the 2018 mini-GEM workshop

Time: 13:50-15:20, Sunday, December 9, 2018, Salon C

ULF modulation of the aurora, Heliophysics/Geospace system observatory coordination for ULF wave studies This session focuses on understanding a variety of mechanisms responsible for ULF modulations of the aurora. Eric Donovan will give a 30 minute invited presentation, with the rest of the session open for presentations and discussion on this topic. We welcome discussion of ULF aurora generation mechanisms and the types of conjunctions, observations, and models needed to understand the zoo of ULF auroral modulations. We also welcome discussion of upcoming observation campaigns/satellite conjunctions that would be particularly useful for ULF wave studies.

• 1. Eric Donovan
• 2. Tetsuo Motoba
• 3. Slava Pilipenko
• 4. Boyi Wang / Toshi Nishimura
• 5. Open discussion

Time: 15:30-17:00, Sunday, December 9, 2018, Salon C

ULF wave modeling challenge and research highlights The first part of the session is for updates on the idealized ULF wave modeling challenge and potential 2019 GEM sessions. The next part of the session is for observation/model presentations relevant to the 27-28 May 2017 ULF wave challenge event and final selection of the modeling challenge targets – all types of models and observations welcome. The last part of the session will be open for 1 slide ULF wave modeling and observation research highlights.

• 1. 2019 GEM session ideas (Mike Hartinger)
• 2. Idealized Modeling Challenge (Lutz Rastaetter)
• 3. ULF wave modeling challenge event updates: Rob Redmon/Sam Califf/Mike Hartinger (GOES magnetometer observations), Yoshi Miyoshi (Arase magnetic field observations), Hyomin Kim (wave-particle interaction), Dong Lin (LFM simulations)
• 4. General ULF wave modeling: Yaireska Collado-Vega TBD (vortex identification/surface waves), Alex Degeling (ULF wave radiation belt interactions)
• 5. Research highlights (1-slide): Rualdo Soto (Van Allen Probes and Cluster satellites’ observations of Pc 5 (mHz) magnetic pulsations), Xueling Shi (SuperDARN ULF waves), Martin Archer (magnetopause surface eigenmodes), Martin Archer (sonification)

Possible sessions for 2019 GEM meeting

We plan at least one session related to recent advances in ULF wave research/general contributions and one for discussion of the ULF wave modeling challenge. We seek feedback on other potential sessions:

• 1. At 2018 GEM meeting, we discussed the possibility of a joint session between Dayside Kinetics, ULF wave, and Interhemispheric FGs on "local vs global" effects and interhemispheric asymmetries associated with different dayside transients: IP shocks, HFAs, high speed jets - if you'd like to provide feedback on this session, please use this google form.
• 2. EMIC wave generation, propagation, and interactions
• 3. ULF wave radiation belt and ring current interactions
• 4. Magnetosphere-Ionosphere coupling via ULF waves
• 5. ULF waves during particle injections and dipolarizations
• 6. Solar wind driven ULF waves
• 7. Role of signal processing in ULF wave studies
• 8. Other topics

Some of these sessions could be joint with other FG and have different formats (e.g., panel discussion, interactive data analysis, contributed talks). If you're interested in one of these topics and/or are willing to coordinate speakers/schedule and lead discussion, please contact the FG co-chairs.