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 - 2022

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?

2019 GEM Session Schedule

Monday, June 22, 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
• Tetsuo Motoba: Interhemispheric behaviors during the ULF challenge event ????
• 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: Flow channel interaction with substorm onset and expansion phase dynamics
• 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