Work Description

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| README.txt |
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Project Information
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Date: September 30, 2024

Dataset Title: Dataset for Multispecies MHD Simulations of the Crustal Field
Influence at the Mars Magnetotail Current Sheet

Dataset Creators: N. A. Quartey, M. W. Liemohn

Dataset Contact: nquartey@umich.edu (N. A. Quartey)

Key Words:
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mars, magnetotail, current sheet, asymmetry, multispecies, multifluid,
MAVEN, MHD

Research Abstract:
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This investigation incorporates seasonal variations within the
BATS-R-US multispecies MHD code to examine the influence of crustal
magnetic fields and the ionosphere on the magnetotail current sheet.
The solar wind interaction at Mars is analyzed for the following cases:
solar maximum at perihelion (PERMAX), solar maximum at aphelion (APHMAX),
solar minimum at perihelion (PERMIN), and solar minimum at aphelion (APHMIN).
The current sheet asymmetry is simulated with and without crustal magnetic
sources and exhibits a duskward (+Y) shift when crustal fields are included.
In simulations that omit crustal sources, the current sheet remains symmetric
along the Y=0 plane. To induce a shift in the current sheet for the
non-crustal field simulations, the ionization rates were adjusted for the
PERMAX and APHMIN cases. For the PERMAX case, ionization rates were increased
by four orders of magnitude, yet the current sheet remained symmetric.
Conversely, for the APHMIN case, ionization rates were reduced by nine orders
of magnitude, resulting in a shift of the current sheet towards +Y.
These results differ from those observed in the multifluid MHD model, suggesting
that the formulas presented in this investigation should be integrated into the
multifluid MHD source code for refined model comparison.

Key Points:
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- Formulas are implemented within the BATS-R-US multispecies MHD code that simulate
the solar wind interaction at Mars with solar cycle and season
- The crustal magnetic fields exert more control over the magnetotail current sheet
shift than the ionosphere. A -Y shift was observed in all cases including crustal
sources no shift was observed in cases omitting crustal sources
- The dayside ionosphere does not contribute to the current sheet shift in multispecies
MHD observations excluding crustal sources

Methodology:
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The data was created using the Block Adaptive Tree Solar wind Roe-Type Upwind Scheme
(BATS-R-US) multispecies MHD code from the Space Weather Modeling Framework (SWMF).
The SWMF is an open-source code available for download at
https://clasp.engin.umich.edu/research/theory-computational-methods/swmf-downloadable-software.

Equations were implemented in the Block Adaptive Tree Solar wind Roe-type Upwind Scheme
(BATS-R-US) multispecies MHD code that include seasons in the simulations, making it
possible to run the solar wind interaction at Mars for PERMAX, APHMAX, PERMIN, and APHMIN.
These cases were run at the University of Michigan Great Lakes High Performance Computing
Cluster and the results were exported using Tecplot 360 EX.

Files contained here:
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- z_0_mhd_permax.plt: Solar maximum at perihelion data in the z=0 plane. Contains magnetic field
and ion density variables
- x_0_mhd_permax.plt: Solar maximum at perihelion data in the x=0 plane. Contains bx result of magnetic
field 2 RM downtail

- z_0_mhd_aphmax.plt: Solar maximum at aphelion data in the z=0 plane. Contains magnetic field
and ion density variables

- z_0_mhd_permin.plt: Solar minimum at perihelion data in the z=0 plane. Contains magnetic field
and ion density variables

- z_0_mhd_aphmin.plt: Solar minimum at aphelion data in the z=0 plane. Contains magnetic field
and ion density variables

- z_0_mhd_permax_omit.plt: Solar maximum at perihelion data without crustal fields in the z=0 plane.
Contains magnetic field and ion density variables without crustal magnetic fields

- z_0_mhd_aphmax_omit.plt: Solar maximum at aphelion data without crustal fields in the z=0 plane.
Contains magnetic field and ion density variables without crustal magnetic fields

- z_0_mhd_permin_omit.plt: Solar minimum at perihelion data without crustal fields in the z=0 plane.
Contains magnetic field and ion density variables without crustal magnetic fields

- z_0_mhd_aphmin_omit.plt: Solar minimum at aphelion data without crustal fields in the z=0 plane.
Contains magnetic field and ion density variables without crustal magnetic fields

- delta.py: Python script that determines the permax, aphmax, permin, and aphmin values

How to use the data and code:
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All .plt files can be accessed using Tecplot 360 EX. The delta.py Python
script can be accessed with any program capable of reading Python 3.9+ files.

Related Publication:
====================
Quartey, N. A. and Liemohn M. W. 2025. Multispecies MHD Simulations of the Crustal Field
Influence at the Mars Magnetotail Current Sheet. Journal of Geophysical Research:
Space Physics

Use and Access:
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This data is made available under an Attribution-NonCommercial 4.0
International license (CC BY-NC 4.0).