COMPASS: A New COnductance Model Based on PFISR And SWARM Satellite Observations

Wang, Zi Han; Zou, Shasha

doi:10.1029/2021sw002958

Cited by 10 publications

(10 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their newly developed model included a full year results of AMIE, and was extended to encompass extreme storm conditions. Wang and Zou (2022) recently reported a statistical conductance model trained from the ground-based PFISR data and in-situ Swarm observations of FACs, providing another option for the community to specify the high-latitude conductance distribution based on FAC information. Studies also suggested that secondary electrons produced by the interaction between precipitating electrons and the neutral atmosphere can reflect multiple times between hemispheres and further contribute to the diffuse aurora (Khazanov et al 2016).…”

Section: Specification Of Ionospheric Conductance In Global Modelsmentioning

confidence: 99%

“…It is suggested that one is aware of the limitations and advantages of these approaches while applying them. For example, as indicated in Robinson et al (2020) and Wang and Zou (2022), larger FACs under more disturbed conditions are less sampled, calling for cautions when applying these models to severe storms.…”

Section: Specification Of Ionospheric Conductance In Global Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Meso-Scale Electrodynamic Coupling of the Earth Magnetosphere-Ionosphere System

Cao

et al. 2022

Space Sci Rev

View full text Add to dashboard Cite

Within the fully integrated magnetosphere-ionosphere system, many electrodynamic processes interact with each other. We review recent advances in understanding three major meso-scale coupling processes within the system: the transient field-aligned currents (FACs), mid-latitude plasma convection, and auroral particle precipitation. (1) Transient FACs arise due to disturbances from either dayside or nightside magnetosphere. As the interplanetary shocks suddenly compress the dayside magnetosphere, short-lived FACs are induced at high latitudes with their polarity successively changing. Magnetotail dynamics, such as substorm injections, can also disturb the current structures, leading to the formation of substorm current wedges and ring current disruption. (2) The mid-latitude plasma convection is closely associated with electric fields in the system. Recent studies have unraveled some important features and mechanisms of subauroral fast flows. (3) Charged particles, while drifting around the Earth, often experience precipitating loss down to the upper atmosphere, enhancing the auroral conductivity. Recent studies have been devoted to developing more self-consistent geospace circulation models by including a better representation of the auroral conductance. It is expected that including these new advances in geospace circulation models could promisingly strengthen their forecasting capability in space weather applications. The remaining challenges especially in the global modeling of the circulation system are also discussed.

show abstract

Section: Specification Of Ionospheric Conductance In Global Modelsmentioning

confidence: 99%

Section: Specification Of Ionospheric Conductance In Global Modelsmentioning

confidence: 99%

Meso-Scale Electrodynamic Coupling of the Earth Magnetosphere-Ionosphere System

Cao

et al. 2022

Space Sci Rev

View full text Add to dashboard Cite

show abstract

“…Liemohn (2020) reviewed the history, limitations, and alternative solutions for the Robinson formulas. Several efforts have recently been made to improve the specification of ionospheric conductances, including using a large data set to determine the relation between electron precipitating flux and ionospheric conductances (Kaeppler et al, 2015(Kaeppler et al, , 2023McGranaghan et al, 2015), applying optimal interpolation analysis (McGranaghan et al, 2016), or determining the relation between FAC and conductances (Robinson et al, 2020;Z. Wang & Zou, 2022).…”

Section: Introductionmentioning

confidence: 99%

Ionospheric Conductances Due To Electron and Ion Precipitations: A Comparison Between EISCAT and DMSP Estimates

Wang,

Cai,

Aikio

et al. 2024

JGR Space Physics

View full text Add to dashboard Cite

Energetic particle precipitation is the major source of electron production that controls the ionospheric Pedersen and Hall conductances at high latitudes. Many studies use empirical formulas to estimate conductances. The particle precipitation spectra measured by the Defense Meteorological Satellite Program (DMSP) Special Sensor J are often used as the input to the empirical formulas. In this study, we evaluate the empirical formulas of ionospheric conductances during four different types of auroral precipitation conditions based on 63 conjugate events observed by DMSP and EISCAT. The conductances calculated from the DMSP data with the empirical formulas are compared with those based on EISCAT measurements with the standard equations. The best correlation between these two is found when the empirical Robinson formulas (Robinson et al., 1987, https://doi.org/10.1029/ja092ia03p02565) are used in the presence of diffuse electron precipitation without ions. In the presence of ion precipitation, the correlation coefficients are smaller, but the correlation improves when the Galand formulas (Galand & Richmond, 2001, https://doi.org/10.1029/1999ja002001) are used to estimate the contribution of ion precipitation to the conductances. We also found that pure ion precipitation can cause the increase of conductances up to 2–7 S for Pedersen and 2.5–10 S for Hall conductances, which is positively correlated with the auroral electrojet index. Overall, the empirical formulas applied to the DMSP particle spectra underestimate the ionospheric conductances.

show abstract

Section: Introductionmentioning

confidence: 99%

“…As a result, the input FACs are not identical to the output FACs (calculated from the electric potential and ionospheric conductance) especially on dusk side. Other studies also investigated the relationships between FACs and ionospheric conductance (e.g., Korth et al, 2014;Mukhopadhyay et al, 2020;Ridley et al, 2004;Wang & Zou, 2022). More recently, Chartier et al (2022) also used the AMPERE FAC to drive the SAMI3 model (Huba et al, 2008), in which the auroral electron precipitation is specified by an empirical model developed by Hardy et al (1985).…”

mentioning

confidence: 99%

Assessment of Using Field‐Aligned Currents to Drive the Global Ionosphere Thermosphere Model: A Case Study for the 2013 St Patrick’s Day Geomagnetic Storm

Zhu

Maute

et al. 2022

Space Weather

View full text Add to dashboard Cite

In this study, field‐aligned currents (FACs) obtained from the Active Magnetosphere and Planetary Electrodynamics Response Experiment data set have been used to specify the high‐latitude electric potential in the Global Ionosphere Thermosphere Model (GITM). The advantages and challenges of the FAC‐driven simulation are investigated based on a series of numerical experiments and data‐model comparisons for the 2013 St Patrick's Day geomagnetic storm. It is found that the cross‐track ion drift measured by the Defense Meteorological Satellite Program satellites can be well reproduced in the FAC‐driven simulation when the electron precipitation pattern obtained from Assimilative Mapping of Ionospheric Electrodynamics (AMIE) technique is used in GITM. It is also found that including the neutral wind dynamo properly is very important when using FACs to derive the high‐latitude electric field. Without the neutral wind dynamo, the cross‐polar‐cap potential and hemispheric integrated Joule heating could be underestimated by more than 20%. Moreover, the FAC‐driven simulation is able to well reproduce the ionospheric response to the geomagnetic storm in the American sector. However, the FAC‐driven simulation yields relatively larger data‐model discrepancies compared to the AMIE‐driven GITM simulation. This may result from inaccurate Joule heating estimations in the FAC‐driven simulation caused by the inconsistency between the FAC and electron precipitation patterns. This study indicates that the FAC‐driven technique could be a useful tool for studying the coupled ionosphere and thermosphere system provided that the FACs and electron precipitation patterns can be accurately specified.

show abstract

COMPASS: A New COnductance Model Based on PFISR And SWARM Satellite Observations

Cited by 10 publications

References 52 publications

Meso-Scale Electrodynamic Coupling of the Earth Magnetosphere-Ionosphere System

Meso-Scale Electrodynamic Coupling of the Earth Magnetosphere-Ionosphere System

Ionospheric Conductances Due To Electron and Ion Precipitations: A Comparison Between EISCAT and DMSP Estimates

Assessment of Using Field‐Aligned Currents to Drive the Global Ionosphere Thermosphere Model: A Case Study for the 2013 St Patrick’s Day Geomagnetic Storm

Contact Info

Product

Resources

About