Diffuse Auroral Precipitation Effects on Ionospheric Conductance During Magnetic Storms: Comparison of Simulated and Incoherent Radar Scatter‐Inferred Conductance.
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| Title: | Diffuse Auroral Precipitation Effects on Ionospheric Conductance During Magnetic Storms: Comparison of Simulated and Incoherent Radar Scatter‐Inferred Conductance. |
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| Authors: | Chen, Margaret W.1 (AUTHOR) Margaret.W.Chen@aero.org, Lemon, Colby1 (AUTHOR), Hecht, James1 (AUTHOR), Khazanov, George V.2 (AUTHOR), Evans, J. Scott3 (AUTHOR), Kaeppler, Stephen4 (AUTHOR), Gabrielse, Christine1 (AUTHOR), Zhang, Shun‐Rong5 (AUTHOR) |
| Source: | Journal of Geophysical Research. Space Physics. Sep2025, Vol. 130 Issue 9, p1-24. 24p. |
| Subject Terms: | *Magnetic storms, Electrical conductivity measurement, Radar |
| Abstract: | We investigated the effects of storm‐time diffuse auroral electron precipitation on ionospheric Pedersen and Hall conductivity and conductance during the CME‐driven St. Patrick's Day storms of 2013 (min Dst = −131 nT) and 2015 (min Dst = −233 nT). These storms were simulated using the magnetically and electrically self‐consistent RCM‐E model with STET modifications, alongside the B3C auroral transport code to compute ionospheric conductivities and height‐integrated conductance. The simulation results were validated against conductance inferred from Poker Flat Incoherent Scatter Radar (PFISR) and Millstone Hill Incoherent Scatter Radar (MHISR) measurements. Our simulations show that the magnetic latitude and local time distribution of Pedersen and Hall auroral conductance strongly correlate with diffuse electron precipitation flux, with the plasmapause marking the low‐latitude boundary of conductance. Simulated Pedersen/Hall conductance agrees reasonably well with PFISR measurements at 65.9° MLAT during diffuse auroral precipitation. During the intense 2015 storm, diffuse aurora extended down to 52.5° MLAT, with simulated conductance agreeing within a factor of two with MHISR observations. Discrete auroral arcs observed during both storms enhanced PFISR conductance by tens of siemens, though these enhancements were not captured by the model. Additionally, the simulated electric intensity showed development of sub‐auroral polarization streams (SAPS) and dawn SAPS features and followed the general trend of Poker Flat electric intensity at 65.9° MLAT during diffuse aurora, despite being updated every 5 min. The overall agreement between simulated ionospheric conductance and electric intensity with observations highlights the model's capability during diffuse auroral precipitation. Key Points: Effects of diffuse electron precipitation on Pedersen and Hall conductance and conductivity are simulated for two major geomagnetic stormsSimulated ionospheric conductance agrees well with conductance inferred from incoherent scatter radar data when there is diffuse auroraSimulated storm‐time electric intensity followed general trends of measured electric intensity from Poker Flat when there is diffuse aurora [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 188294973 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Diffuse Auroral Precipitation Effects on Ionospheric Conductance During Magnetic Storms: Comparison of Simulated and Incoherent Radar Scatter‐Inferred Conductance. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Chen%2C+Margaret+W%2E%22">Chen, Margaret W.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Margaret.W.Chen@aero.org</i><br /><searchLink fieldCode="AR" term="%22Lemon%2C+Colby%22">Lemon, Colby</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hecht%2C+James%22">Hecht, James</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khazanov%2C+George+V%2E%22">Khazanov, George V.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Evans%2C+J%2E+Scott%22">Evans, J. Scott</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kaeppler%2C+Stephen%22">Kaeppler, Stephen</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gabrielse%2C+Christine%22">Gabrielse, Christine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Shun‐Rong%22">Zhang, Shun‐Rong</searchLink><relatesTo>5</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Sep2025, Vol. 130 Issue 9, p1-24. 24p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Magnetic+storms%22">Magnetic storms</searchLink><br /><searchLink fieldCode="DE" term="%22Electrical+conductivity+measurement%22">Electrical conductivity measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Radar%22">Radar</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We investigated the effects of storm‐time diffuse auroral electron precipitation on ionospheric Pedersen and Hall conductivity and conductance during the CME‐driven St. Patrick's Day storms of 2013 (min Dst = −131 nT) and 2015 (min Dst = −233 nT). These storms were simulated using the magnetically and electrically self‐consistent RCM‐E model with STET modifications, alongside the B3C auroral transport code to compute ionospheric conductivities and height‐integrated conductance. The simulation results were validated against conductance inferred from Poker Flat Incoherent Scatter Radar (PFISR) and Millstone Hill Incoherent Scatter Radar (MHISR) measurements. Our simulations show that the magnetic latitude and local time distribution of Pedersen and Hall auroral conductance strongly correlate with diffuse electron precipitation flux, with the plasmapause marking the low‐latitude boundary of conductance. Simulated Pedersen/Hall conductance agrees reasonably well with PFISR measurements at 65.9° MLAT during diffuse auroral precipitation. During the intense 2015 storm, diffuse aurora extended down to 52.5° MLAT, with simulated conductance agreeing within a factor of two with MHISR observations. Discrete auroral arcs observed during both storms enhanced PFISR conductance by tens of siemens, though these enhancements were not captured by the model. Additionally, the simulated electric intensity showed development of sub‐auroral polarization streams (SAPS) and dawn SAPS features and followed the general trend of Poker Flat electric intensity at 65.9° MLAT during diffuse aurora, despite being updated every 5 min. The overall agreement between simulated ionospheric conductance and electric intensity with observations highlights the model's capability during diffuse auroral precipitation. Key Points: Effects of diffuse electron precipitation on Pedersen and Hall conductance and conductivity are simulated for two major geomagnetic stormsSimulated ionospheric conductance agrees well with conductance inferred from incoherent scatter radar data when there is diffuse auroraSimulated storm‐time electric intensity followed general trends of measured electric intensity from Poker Flat when there is diffuse aurora [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1029/2025JA034069 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 1 Subjects: – SubjectFull: Magnetic storms Type: general – SubjectFull: Electrical conductivity measurement Type: general – SubjectFull: Radar Type: general Titles: – TitleFull: Diffuse Auroral Precipitation Effects on Ionospheric Conductance During Magnetic Storms: Comparison of Simulated and Incoherent Radar Scatter‐Inferred Conductance. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Chen, Margaret W. – PersonEntity: Name: NameFull: Lemon, Colby – PersonEntity: Name: NameFull: Hecht, James – PersonEntity: Name: NameFull: Khazanov, George V. – PersonEntity: Name: NameFull: Evans, J. Scott – PersonEntity: Name: NameFull: Kaeppler, Stephen – PersonEntity: Name: NameFull: Gabrielse, Christine – PersonEntity: Name: NameFull: Zhang, Shun‐Rong IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 21699380 Numbering: – Type: volume Value: 130 – Type: issue Value: 9 Titles: – TitleFull: Journal of Geophysical Research. Space Physics Type: main |
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