FG: Interhemispheric Approaches to Understand M-I Coupling (IHMIC)

Focus Group Leaders

• Hyomin Kim, New Jersey Institute of Technology (hmkim@njit.edu)
• Robert Lysak, University of Minnesota
• Tomoko Matsuo, University of Colorado at Boulder

Focus Group Term

• 2018 - 2023 (1 year extended due to the pandemic)

Focus Group Topic Description and Science Questions

The main goal of this focus group is to understand the interhemispheric symmetry/asymmetry in geomagnetic fields and its effects on M-I coupling. Observational and modeling studies have shown the interhemispheric differences which are manifested in various signatures, e.g., large-scale current systems, auroral forms, waves, ion upflow, outflow, particle precipitation, high-latitude convection and thermospheric winds. The focus group addresses questions as to how to incorporate interhemispheric differences and their effects on M-I coupling in observations and modeling/simulations. The overarching science questions that this focus group will be addressing are:

1. In what aspect does the asymmetry in geomagnetic fields play a role in M-I coupling?
2. How are the interhemispheric differences related to solar wind and geomagnetic activities?
3. What are interhemispheric differences in storm and substorm signatures, wave activity and particle precipitation? What controls these differences?
4. How do interhemispheric differences in ionospheric conductivity affect solar wind coupling to the magnetosphere, ionosphere and thermosphere?
5. What are effects of the neutral wind dynamo in the application of Ohm's law to ionosphere-magnetosphere coupling? Does the neutral wind dynamo contribute to the interhemispheric asymmetry in M-I coupling?

2021 mini-GEM (hybrid) Session Schedule

Session 1: Sunday, December 12, 14:00 - 15:30 (US Central Time)

• Christine Gabrielse
• Dillon Gillespie
• Zihan Wang
• Shannon Hill
• Agnit Mukhopadhyay
• Yining Shi
• Astrid Maute, Lower atmospheric forcing on asymmetries to magnetosphere-ionosphere coupling
• John Coxon

Session 2: Sunday, December 12, 15:45 - 17:15 (US Central Time)

• Mark Engebretson, Magnetic Perturbation Events (MPEs) that cause GICs: Investigating their Interhemispheric Conjugacy and Control by IMF Orientation
• Yu Hong
• Hyomin Kim, Characterization of Interhemispheric Asymmetries Driven by External Drivers
• Sungjun Noh, Pc 1 wave observations associated with foreshock transient events
• Zhonghua Xu, The role of shock impact angle in asymmetric ground magnetic responses
• Xueling Shi
• Marc Hairston

2020 mini-VGEM Session Schedule

Thursday, January 21, 10:00 am - 12:00 pm (US Eastern Time)

Overarching questions for this session:

1. How can the level of asymmetry be quantified from various observations and modeling results?
2. What will be the next step forward in understanding interhemispheric MI coupling?
3. What type of research from other sub-disciplines could be helpful to close the gap in our understanding of interhemispheric MI coupling?

Presentation List:

• Hyomin Kim, Interhemispheric Asymmetries in High-Latitude M-I Coupling Processes: Magnetic field Perturbations, Currents and Convection
• Sungjun Noh, Interhemispheric Ground Responses to Hot Flow Anomalies
• Astrid Maute, MI coupling considering interhemispheric asymmetries: ionospheric perspective
• Ramon Lopez, The Center for the Unified Study of Interhemispheric Asymmetries: Research Focus and Future plans
• Claudia Stolle, Characteristics of auroral field-aligned current viewed by different missions (GRACE-FO, DMSP, i.a.)
• Robert Strangeway, Interhemispherical Asymmetries in Radial Currents Observed at Low Altitudes by AMPERE During a Geomagnetic Storm
• Anthea Coster, Joseph Huba, Stan Sazykin, and Richard Wolf, Model-Data Exploration of Hemispherical Asymmetries in the Magnetosphere /Ionosphere System
• Michael Hartinger, Inter-hemispheric Comparisons during High-Latitude Solar Eclipses

2020 VGEM Session Schedule

All sessions will take place virtually on Zoom. Please log into the VGEM website to get access to the sessions. We will try the traditional way for Q/A by using your own mic/speaker. Use Zoom to "raise your hand" to ask questions.

Thursday, July 23, 1:00 pm - 2:30 pm (US Eastern Time)

• Dan Welling, CUSIA: The Center for the Unified Study of Interhemispheric Asymmetries
• Mark Engebretson, Interhemispheric comparisons of large nighttime magnetic perturbation events relevant to GICs
• Bob Lysak, Quarter wave modes: Variation of the conductance ratio
• Zhonghua Xu, Interhemispheric ULF comparison related to Interplanetary shocks
• Ray Lopez and Bob Strangeway, The Center for Understanding Interhemispheric Asymmetries Initial Event Studies

Thursday, July 23, 3:00 pm - 4:30 pm (US Eastern Time)

• James Weygand, Examples of Hemispherically Conjugate Auroral Omega Bands
• Stephan C. Buchert, Sq and Interhemispherically Entangled Dynamos
• Qing-He Zhang Multiple transpolar auroral arcs reveal insight about coupling processes in the Earth’s magnetotail
• Delores Knipp and Liam Kilcommons, DMSP Poynting Flux in The Auroral Zone and Polar Cap from Both Hemispheres
• Xueling Shi, Interhemispheric Observations of Ground Responses to Upstream Transients
• Yu Hong, Inter-hemispheric asymmetries in high-latitude I-T system: GITM simulations

2019 mini-GEM Session Schedule

Location: Holiday Inn-Golden Gateway, 1500 Van Ness Ave, San Francisco, CA. Time: 12:00 - 13:30

• Bob Lysak, Numerical Investigation of Quarter-Wave Modes
• Zhonghua Xu, Inter-hemispheric comparison of ground magnetic response to interplanetary shocks: Shock impact angle versus timing and intensities of ground magnetic response
• Bob Clauer, PRIC project update
• Thom Edwards, Recent Events from DTU's Magnetometer Program and Our Role in Interhemispheric Comparisons
• Thom Edwards, Incidence of Alfvenic SC pulse (1-2 slides from Slava Pilipenko)
• Yining Shi, Event study of field-aligned currents (FACs) and their interhemispheric asymmetries revealed by assimilative analysis of AMPERE magnetic perturbation data
• KathrynR. Kirkevold (presented by Thom Edwards), Interhemispheric Comparisons of Large Nighttime Magnetic Perturbation Events
• James Weygand, The Response of Field Aligned Currents to Northward Interplanetary Magnetic Field

2019 GEM Session Schedule

Monday, June 24, 3:30 pm - 5:00 pm (Room: Lumpkins Ballroom)

• Denny Oliveira: Asymmetric satellite orbital drag effects during magnetic storms
• Zhonghua Xu: Inter-hemispheric asymmetries in the ground magnetic response to interplanetary shocks: The role of shock impact angle
• Brain Anderson: Update on simultaneous northern and southern hemisphere measures of latitudes and intensities of Birkeland currents from AMPERE
• Shini Ohtani: Dependence of the auroral electrojet intensity on the solar illumination and dipole tilt
• Christine Gabrielse: The difference between meso-scale flow speeds between summer and winter hemispheres
• Tetsuo Motoba: Asymmetric SC/Pc5 amplitudes at the Syowa–Iceland conjugate pair
• Discussion on asymmetry issues and community input (campaign(s), future Antarctic project(s), etc)

Tuesday, June 25, 10:30 am - 12:00 pm (joint session with the MAPS session, Room: Lumpkins Ballroom)

• Toshi Nishimura: Magnetospheric source and inter-hemispheric conjugacy of STEVE arc
• Larry Lyons: Outstanding questions on the role of meso-scale flow channels in the coupled M-I system
• Anders Ohma: How asymmetries in geospace evolve during increased tail reconnection
• Mike Hartinger: Possible experiments/observational campaigns to explore IH asymmetries during the upcoming 2020/2021 southern hemisphere solar eclipses
• Shane Coyle: An experimental approach to inter-hemispheric asymmetries in the ground magnetic response of magnetospheric ULF waves
• Discussion on asymmetry issues and community input (campaign(s), future Antarctic project(s), etc)

Wednesday (June 26) 10:30 am - 12:00 pm (joint session with the UMEA and DAYS sessions, Room: Santa Fe )

• 10:30-10:35 Tom Elsden: Session introduction and goals
• 10:35-10:50 Ferdinand Plaschke: An overview of dayside transients causing ULF waves
• 10:50-11:00 Tom Elsden: 3D ULF wave modeling with MHD
• 11:00-11:10 Boyi Wang: A statistical investigation of the role of magnetosheath high-speed jets in triggering magnetospheric Pc5 ULF waves
• 11:10-11:20 Bob Lysak: Modeling ionospheric conductance and ground magnetic fields
• 11:20-11:30 Xueling Shi: Conjugate Observations of ULF Waves during an Extended Period of Radial IMF
• 11:30-11:40 Michael Hartinger: Localized magnetopause surface wave activity and modeling challenges
• 11:40-12:00 Discussion: Tackle questions arising from talks as well as current and future science goals

2018 Mini-GEM Schedule

The session took place in Room 5 (Potomac) from 13:50-15:20, on Sunday December 9th at the Hilton Old Town Alexandria in Alexandria, Virginia (1767 King St, Alexandria, VA 22314).

• James Weygand (UCLA): Hemispherically Conjugate Magnetometer Observations
• Martin Connors (Athabasca U) : AUTUMNX Magnetometer Array: Conjugacy with GOES East, Antarctica, and Other Assets
• Shin Ohtani (APL/JHU): The solar zenith angle dependence of the auroral electrojets
• Astrid Maute (NCAR): Forcing the TIEGCM with interhemispheric different AMPERE field-aligned current
• Xueling Shi (VT): Conjugate Observations of ULF Waves during an Extended Period of Radial IMF
• Zhonghua Xu (VT): Inter-hemispheric asymmetries in the ground magnetic response to interplanetary shocks: The role of shock impact angle
• Dan Weimer (VT): A Quick Look at Results From the Antarctic 40 Degree Magnetic Meridian Chain

2018 GEM Session Schedule

There will be two sessions on Friday (June 22). Please note that the afternoon session is a joint session with the focus group “3D Ionospheric Electrodynamics and its impact on MIT coupling (IEMIT)”.

This year, we are encouraging more discussion and discouraging AGU-style presentations, limiting each talk to 3-4 slides focused on results and outstanding questions. If you are interested in presenting interhemispheric studies, please use this signup form at: [Google Form].

Please also note that there will be GEM-CEDAR joint sessions on Saturday (June 23). The second session from 10:30 to 12:00 will cover "Interhemispheric Processes/Symmetries/Asymmetries".

Friday, June 22, 10:30-12:00

• Michael Hartinger: Inter-hemispheric comparisons of current systems with different temporal and spatial scales
• Kristian Snekvik: Why we no longer believe tail reconnection is important for inducing B_Y in the nightside magnetosphere
• Jim LaBelle: How conjugate auroral radio emission observations can contribute to understanding hemispheric asymmetries
• Robert McPherron and James Weygand: Conjugate Delays Using Correlation and Wave Analysis
• Yining Shi: Modes of Field-aligned Currents (FACs) Variability and Their Hemispheric Asymmetry Revealed by Inverse and Assimilative Analysis of Iridium Magnetometer Data
• Shin Ohtani: Local vs. global interhemispheric (seasonal) differences of FACs and precipitation
• Tetsuo Motoba, Asymmetric evolution of interhemispheric conjugate preonset aurora

Friday, June 22, 13:30-15:00 (IEMIT-IHMIC Joint FG Session)

10min is given per talk. We recommend to prepare 7min talk + 3min discussion. You can check the same schedule in the following website. [IEMIT].

• Bob Clauer: Inter-hemispheric Comparisons along the 40-degree magnetic meridian
• Denny Oliveira: GIC induced by interplanetary planetary shocks
• Michelle Salzano: A Statistical Analysis of Interhemispheric Pi1B Seasonal Variations
• Hyunju Connor -Solar wind dynamic pressure impact on high-latitude neutral density enhancement: OpenGGCM-CTIM results
• Doga Ozturk - Modeling of coupled MIT system response to solar wind dynamic pressure enhancement
• Kevin Pham - CMIT-IPWM one way coupling - Thermosphere impact on the magnetosphere
• Open discussions and walk-in presentations