Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements
Abstract We calculate high latitude electrodynamic parameters using global maps of field‐aligned currents from the Active Magnetosphere and Planetary Response Experiment (AMPERE). The model is based on previous studies that relate field‐aligned currents to auroral Pedersen and Hall conductances meas...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-04-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2020SW002677 |
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| author | R. M. Robinson Larry Zanetti Brian Anderson Sarah Vines Jesper Gjerloev |
| author_facet | R. M. Robinson Larry Zanetti Brian Anderson Sarah Vines Jesper Gjerloev |
| author_sort | R. M. Robinson |
| collection | DOAJ |
| description | Abstract We calculate high latitude electrodynamic parameters using global maps of field‐aligned currents from the Active Magnetosphere and Planetary Response Experiment (AMPERE). The model is based on previous studies that relate field‐aligned currents to auroral Pedersen and Hall conductances measured by incoherent scatter radar. The field‐aligned currents and conductances are used to solve for the electric potential at high latitudes from which electric fields are computed. The electric fields are then used with the conductances to calculate horizontal ionospheric currents. We validate the results by simulating the SuperMAG magnetic indices for 30 geomagnetically active days. The correlation coefficients between derived and actual magnetic indices were 0.68, 0.76, and 0.84 for the SMU, SML, and SME indices, respectively. We show examples of times when the simulations differ markedly from the measured indices and attribute them to either small‐scale, substorm‐related current structures or the effects of neutral winds. Overall, the performance of the model demonstrates that with few exceptions, auroral electrodynamic parameters can be accurately deduced from the global field‐aligned current distribution provided by AMPERE. |
| format | Article |
| id | doaj-art-a13063373178441b9239328d3642ba1a |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-a13063373178441b9239328d3642ba1a2025-01-14T16:31:28ZengWileySpace Weather1542-73902021-04-01194n/an/a10.1029/2020SW002677Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current MeasurementsR. M. Robinson0Larry Zanetti1Brian Anderson2Sarah Vines3Jesper Gjerloev4The Catholic University of America Washington DC USAJohns Hopkins University Applied Physics Laboratory Laurel MD USAJohns Hopkins University Applied Physics Laboratory Laurel MD USAJohns Hopkins University Applied Physics Laboratory Laurel MD USAJohns Hopkins University Applied Physics Laboratory Laurel MD USAAbstract We calculate high latitude electrodynamic parameters using global maps of field‐aligned currents from the Active Magnetosphere and Planetary Response Experiment (AMPERE). The model is based on previous studies that relate field‐aligned currents to auroral Pedersen and Hall conductances measured by incoherent scatter radar. The field‐aligned currents and conductances are used to solve for the electric potential at high latitudes from which electric fields are computed. The electric fields are then used with the conductances to calculate horizontal ionospheric currents. We validate the results by simulating the SuperMAG magnetic indices for 30 geomagnetically active days. The correlation coefficients between derived and actual magnetic indices were 0.68, 0.76, and 0.84 for the SMU, SML, and SME indices, respectively. We show examples of times when the simulations differ markedly from the measured indices and attribute them to either small‐scale, substorm‐related current structures or the effects of neutral winds. Overall, the performance of the model demonstrates that with few exceptions, auroral electrodynamic parameters can be accurately deduced from the global field‐aligned current distribution provided by AMPERE.https://doi.org/10.1029/2020SW002677auroral currentsauroral electrodynamicsconductivitieselectric fieldsfield‐aligned currentsspace weather |
| spellingShingle | R. M. Robinson Larry Zanetti Brian Anderson Sarah Vines Jesper Gjerloev Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements Space Weather auroral currents auroral electrodynamics conductivities electric fields field‐aligned currents space weather |
| title | Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements |
| title_full | Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements |
| title_fullStr | Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements |
| title_full_unstemmed | Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements |
| title_short | Determination of Auroral Electrodynamic Parameters From AMPERE Field‐Aligned Current Measurements |
| title_sort | determination of auroral electrodynamic parameters from ampere field aligned current measurements |
| topic | auroral currents auroral electrodynamics conductivities electric fields field‐aligned currents space weather |
| url | https://doi.org/10.1029/2020SW002677 |
| work_keys_str_mv | AT rmrobinson determinationofauroralelectrodynamicparametersfromamperefieldalignedcurrentmeasurements AT larryzanetti determinationofauroralelectrodynamicparametersfromamperefieldalignedcurrentmeasurements AT briananderson determinationofauroralelectrodynamicparametersfromamperefieldalignedcurrentmeasurements AT sarahvines determinationofauroralelectrodynamicparametersfromamperefieldalignedcurrentmeasurements AT jespergjerloev determinationofauroralelectrodynamicparametersfromamperefieldalignedcurrentmeasurements |