Ramiz Qudsi
From state of caffeination to citation!
Magnetopause Reconnection and
PVI Enhancement
Link to the presentation
Outline:
- Magnetopause Magnetic Reconnection
- Magnetic Partial Variance of Increments
- Region of interest
- Data and Methodology
- Results and Discussions
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The BASICS
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Source: NASA
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Reconnection at the Magnetopause
[Broll et al., 2017]
Source: wikipedia
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Inflow
Inflow
Reconnection at the Magnetopause
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Magnetic Partial Variance of Increments:
\mathcal{I}(t, \delta t) = \frac{|\Delta \mathbf{B}(t, \delta t)|}{\sqrt{\langle |\Delta \mathbf{B}(t, \delta t)|^2 \rangle}_{\mathcal{T}}}
\Delta \mathbf{B}(t, \delta t) = \mathbf{B}(t+\delta t) - \mathbf{B}(t)
Vector increment
Lag
averaging period
[Greco et al., 2008]
PVI < 3 ==> Maxwellian Plasma
PVI ~ 5-6 ==> Current Sheets
PVI ~ 6-8 ==> Reconnection Jets
So much in that excellent formula
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Magnetic Partial Variance of Increments:
[Servidio et al., 2011]
Demonstration of the effectiveness of identifying the reconnection locations using PVI technique
For threshold value larger than 5, the goodness of identification was found to be
~ 85%.
Region of interest:
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DATA and Methodology
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Data
Solar Wind data: OMNI (propagated to the magnetopause)
Magnetosheath data: MMS (FPI and FGM)
Magnetospheric magnetic field: Models (T96 and IGRF)
Magnetosheath magnetic field: Models (Cooling model)
GSM coordinate system
y
z
x
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Methodology
- Look at the instances when MMS observed a jet reversal while crossing the magnetopause.
Qudsi (qudsira@bu.edu)
Methodology
- Look at the instances when MMS observed a jet reversal while crossing the magnetopause.
Qudsi (qudsira@bu.edu)
V_{\rm p}
t
+ \Delta V
- \Delta V
|\Delta V |= 70\, km/s
|\Delta t | \leq 2\, minutes
[Broll et al., 2017]
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Magnetosheath
Magnetosphere
MMS data (FPI & FGM)
[Qudsi et al., 2023]
Jet Center
Methodology
- Compute PVI for the 10-minute duration for each jet detection
- Study the enhancements in PVI at and around the jet location
Qudsi (qudsira@bu.edu)
- Look at the instances when MMS observed a jet reversal while crossing the magnetopause.
\left< \Delta V_{L} \right> = \pm 70 km/s
Results and Discussion
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Variation of ion-inertial length in and around the terrestrial magnetopause based on a combination of MHD and PIC simulations
[Toth et al., 2017]
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Concluding Remarks and Future Works
- Enhancement in PVI is observed at the location of reconnection jets (for the case studies)
- Is there a statistical correlation?
- Can we use PVI as a proxy for reconnection?
- What threshold of PVI?
- Dependency on upstream solar wind conditions?
- Is there a statistical correlation?
SAO Talk - 2024
By Ramiz Qudsi
