FG: Comparative Planetary Magnetospheric Processes
2023 GEM Summer Workshop
COmparative Planetary Magnetospheric Processes (COMP) focus group will hold 2 stand-alone sessions and 2 joint sessions. Please note that in the agenda below, the exact presentation time may vary depending on the actual evolution of the meeting.
In this inaugural FG, one of our main objectives is to gather community feedback on how to best pursue this topic to make meaningful progress in comparative magnetospheric processes. Therefore, we will have a series of scene setting talks followed by an open discussion session. In the open discussion part, we encourage participants to prepare 2-3 slides and be ready to share as the conversation evolves. One of our major goals is to unveil the wide range of questions that can be addressed by exploring the vast physical parameter space within our solar system. To achieve this goal, we need to access our modeling capabilities, evaluate the level of maturity of available data sets and theories, identify the community needs to facilitate future comparative studies, and establish effective strategies for coordinating efforts among different communities.
1. COMP Stand-alone Session (10:30–12:00 Monday, June 12, Room A)
Exploring the parameter space of magnetospheric physics
10:30 Overview of FG
10:40 Scene Setting Talk: magnetospheric dynamics and reconnection (Dan Gershman)
10:55 Grant Stephens: magnetic field modeling of Mercury, Earth, & Saturn
11:05 Ryan Dewey: Mercury's dawn-dusk magnetotail asymmetries and their relationship with magnetic activity
11:15 Xuanye Ma: Review of the KHI at the different planets
Open discussion: what are the big questions that can be addressed by exploring the vast physical parameter space within our solar system? (Co-chairs, Fran Bagenal, Bob Lysak)
11:25 Some elements to consider: Modeling capabilities; maturity of topic & data sets; relevance to comparative planetary needs/topics
11:55 Summary and future endeavors
2. MPEC-COMP Joint Session (10:30–12:00 Tuesday, June 13, Room A)
10:30 Opening remarks
10:40 Bob Lysak: MI-coupling w/ emphasis on comparative processes between Earth & Jupiter
10:55 Jim Raines: Cusp precipitation at Mercury
Coming soon
3. COMP Stand-alone Session (13:30–15:00 Tuesday, June 13, Room Coa)
13:30 Summary & refined open questions from previous sessions
13:45 Lisa Winter: NSF talk on comparative planetary magnetosphere funding opportunities
13:55 Nithin Sivadas: Solar wind driving of planetary magnetospheres
14:05 Chuanfei Dong: Using Mercury and Ganymede to Learn Earth’s Responses to Extreme Space Weather Events
14:15 Jaya Joseph: ECH waves at Jupiter and some comparisons with Earth and Saturn
14:25–15:30 Open discussion on various topics (panel members: Co-chairs, Fran Bagenal, Bob Lysak)
- Ideas on how to best organize topics/goals to address the big questions
- Identify specific case events in various mission data sets & potential GEM challenges that will help enable the community to address the open questions
- Coordinating efforts and discussion of potential funding avenues for cross-divisional/disciplinary science
4. COMP-RB-DIP Joint Session (10:30–12:00 Wednesday, June 14, Room A)
10:30 Opening remarks from FG leads
10:40 Scene Setting Talk: Radiation belt dynamics w/ emphasis on comparative source and acceleration processes (Peter Kollmann)
10:55 Sasha Drozdov: Modeling of Saturn’s radiation environment using the VERB code
11:05 Anthony Sciola: Comparing injections and interchange instability between Earth and Saturn
11:15 Anton Artemyev: Role of electron field-aligned streams in current sheet configuration in Jovian and Earth magnetotails
11:15–12:00 Open Discussion + Walk-in talks
Chairs
| Name | Affiliation | Contact Details |
|---|---|---|
| George Clark | John Hopkins Applied Physics Lab | george.clark at jhuapl.edu |
| Wen Li | Boston University | wenli77 at bu.edu |
| Bob Marshall | University of Colorado Boulder | robert.marshall at colorado.edu |
| Dan Gershman | NASA Goddard Space Flight Center | daniel.j.gershman at nasa.gov |
| Peter Delamere | University of Alaska Fairbanks | padelamere at alaska.edu |
| Shannon Curry | University of California, Berkeley | smcurry at berkeley.edu |
Science Topic
The Solar System is gifted with a diverse array of magnetospheric systems, from the familiar
Dungey-cycle-driven system at Earth, to the extreme Vasyliunas-cycle-driven Gas Giants, to the
unmagnetized-solar wind interactions found at Mars and Venus. Together, this diverse set of
planetary magnetospheres makes it possible to probe fundamental physical processes by exploring
how and under what conditions they operate in and across the Solar System. Furthermore, if we
can make sense of this large parameter regime then not only will we improve our understanding of
the geospace environment, but we may be able to close the gap in our understanding of plasma
physics elsewhere in the cosmos, e.g., magnetospheres of pulsars and brown dwarfs. However, to
reach that goal, it requires the Earth and Planetary space physics communities to give serious
consideration to the physics behind the similarities and differences between these systems. That
brings us to the primary goal of this focus group (FG)—to assess the physical processes
within our Solar System that ultimately shape these planetary magnetospheric environments
with the aim of uncovering parameter regimes associated with distinct and universal
mechanisms.
Studying all the processes is an overwhelming and unrealistic task, so we propose the
following key comparative topics that directly relate to the active GEM focus groups: 1)
comparative magnetotail dynamics and their effects on the transport of mass, momentum,
energy, and magnetic flux; 2) comparative planetary radiation belts and ring currents and
the processes that source and sustain them across drastically different magnetospheres; 3)
comparative magnetosphere-ionosphere coupling mechanisms, e.g., precipitation,
acceleration, outflow, and drivers across solar wind driven, internally driven, and induced
magnetospheres. Even still this list is quite broad relative to the typical GEM FGs; however, one
of the main objectives of this FG is to establish GEM as the leading forum where comparative
planetary magnetospheric processes are workshopped to foster interactions between
communities. In a way, this is similar to the original NSF initiative that led to the GEM program
where we are aiming to form a community consensus on the outstanding questions that can be
addressed on a few year time scale. Therefore, our expectation is that after we establish the big
open questions that are common across planetary magnetospheres, we can then workshop those by
making novel use of the datasets and modelling outputs available.
Goals & Deliverables
- Primary Community Goal: Establish GEM as the leading forum where comparative planetary magnetospheric processes are workshopped to foster interactions between communities.
- Primary Science Goal: Assess the physical processes within our Solar System that ultimately shape the diverse planetary magnetospheric environments with the aim of uncovering parameter regimes associated with distinct and universal mechanisms.
Community Deliverables: 1) First and foremost, develop a forum where the GEM and planetary magnetospheric (a relatively small group) communities can come together to discuss the most
interesting and pressing synergistic problems; 2) develop tools and user guides (including a compendium of relevant papers) to facilitate in sharing of data and simulation outputs between the Earth and Planetary magnetospheric communities; 3) produce an event list across the various Planetary and Terrestrial missions for the community to focus on specific comparative aspects.
Science Deliverables: 1) evaluate the maturity of specific magnetospheric processes at different planets (e.g., importance of radial transport in supplying radiation belts, how material laden magnetospheres sculpt particle distributions, how ion outflow is modified between strongly and Figure 2: Images of Jupiter’s (panel A), and Earth’s (panel B) northern auroral regions. Right panel illustrates Jupiter’s modeled magnetic field based on its fast rotation and interaction with the solar wind. Credit: Zhang et al. (2021). weakly magnetized planets, etc.) and the robustness of corresponding datasets; 2) once objective 1 is complete, rank specific outstanding problems that can be addressed within current observations
and modelling capabilities; 3) strive to develop semi-empirical relationships associated with the outstanding problems in objective (2) to aid in future modelling efforts.
Expected Activities
We will organize workshop-style sessions at GEM summer and mini-GEM workshops to foster interactions between these similar communities so we can address the comparative science topics. Specific activities include:
1) review current understanding of magnetospheric processes in different planets and identify key questions that can be investigated with current data sets & modeling capabilities (may vary from planet-to-planet);
2) identify specific events to analyze;
3) pursue data-model comparisons to identify physical mechanisms or perhaps the absence thereof;
4) assess under what conditions (e.g., internally driven vs. externally driven vs. induced interactions; material laden environments; moons sourcing local waves that may seed radiation belts, etc.) certain processes are dominant or no longer exist.
