Associating ground magnetometer observations with current or voltage generators

M. D. Hartinger, Z. Xu, C. R. Clauer, Y. Yu, D. R. Weimer, H. Kim, V. A. Pilipenko, D. T. Welling, Rico Behlke, Anna Naemi Willer

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A circuit analogy for magnetosphere-ionosphere current systems has two extremes for driversof ionospheric currents: ionospheric elec tric fields/voltages constant while current/conductivity vary—the“voltage generator”—and current constant while electric field/conductivity vary—the “current generator.”Statistical studies of ground magnetometer observations associated with dayside Transient High LatitudeCurrent Systems (THLCS) driven by similar mechanisms find contradictory results using this paradigm:some studies associate THLCS with voltage generators, others with current generators. We argue that mostof this contradiction arises from two assumptions used to interpret ground magnetometer observations:(1) measurements made at fixed position relative to the THLCS field-aligned current and (2) negligibleauroral precipitation contributions to ionospheric conductivity. We use observations and simulations toillustrate how these two assumptions substantially alter expectations for magnetic perturbations associatedwith either a current or a voltage generator. Our results demonstrate that before interpreting groundmagnetometer observations of THLCS in the context of current/voltage generators, the location of a groundmagnetometer station relative to the THLCS field-aligned current and the location of any auroral zoneconductivity enhancements need to be taken into account.
Original languageEnglish
JournalJournal of Geophysical Research: Space Physics
Volume122
Issue number7
Pages (from-to)7130–7141
ISSN2169-9380
DOIs
Publication statusPublished - 2017

Keywords

  • Ground magnetometer
  • TCV
  • Sudden commencement;
  • Current generator
  • Voltage generator
  • Magnetosphere-ionosphere coupling

Cite this

Hartinger, M. D. ; Xu, Z. ; Clauer, C. R. ; Yu, Y. ; Weimer, D. R. ; Kim, H. ; Pilipenko, V. A. ; Welling, D. T. ; Behlke, Rico ; Naemi Willer, Anna. / Associating ground magnetometer observations with current or voltage generators. In: Journal of Geophysical Research: Space Physics. 2017 ; Vol. 122, No. 7. pp. 7130–7141 .
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title = "Associating ground magnetometer observations with current or voltage generators",
abstract = "A circuit analogy for magnetosphere-ionosphere current systems has two extremes for driversof ionospheric currents: ionospheric elec tric fields/voltages constant while current/conductivity vary—the“voltage generator”—and current constant while electric field/conductivity vary—the “current generator.”Statistical studies of ground magnetometer observations associated with dayside Transient High LatitudeCurrent Systems (THLCS) driven by similar mechanisms find contradictory results using this paradigm:some studies associate THLCS with voltage generators, others with current generators. We argue that mostof this contradiction arises from two assumptions used to interpret ground magnetometer observations:(1) measurements made at fixed position relative to the THLCS field-aligned current and (2) negligibleauroral precipitation contributions to ionospheric conductivity. We use observations and simulations toillustrate how these two assumptions substantially alter expectations for magnetic perturbations associatedwith either a current or a voltage generator. Our results demonstrate that before interpreting groundmagnetometer observations of THLCS in the context of current/voltage generators, the location of a groundmagnetometer station relative to the THLCS field-aligned current and the location of any auroral zoneconductivity enhancements need to be taken into account.",
keywords = "Ground magnetometer, TCV, Sudden commencement;, Current generator, Voltage generator, Magnetosphere-ionosphere coupling",
author = "Hartinger, {M. D.} and Z. Xu and Clauer, {C. R.} and Y. Yu and Weimer, {D. R.} and H. Kim and Pilipenko, {V. A.} and Welling, {D. T.} and Rico Behlke and {Naemi Willer}, Anna",
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Hartinger, MD, Xu, Z, Clauer, CR, Yu, Y, Weimer, DR, Kim, H, Pilipenko, VA, Welling, DT, Behlke, R & Naemi Willer, A 2017, 'Associating ground magnetometer observations with current or voltage generators', Journal of Geophysical Research: Space Physics, vol. 122, no. 7, pp. 7130–7141 . https://doi.org/10.1002/2017JA024140

Associating ground magnetometer observations with current or voltage generators. / Hartinger, M. D.; Xu, Z.; Clauer, C. R.; Yu, Y.; Weimer, D. R. ; Kim, H.; Pilipenko, V. A.; Welling, D. T.; Behlke, Rico; Naemi Willer, Anna.

In: Journal of Geophysical Research: Space Physics, Vol. 122, No. 7, 2017, p. 7130–7141 .

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Associating ground magnetometer observations with current or voltage generators

AU - Hartinger, M. D.

AU - Xu, Z.

AU - Clauer, C. R.

AU - Yu, Y.

AU - Weimer, D. R.

AU - Kim, H.

AU - Pilipenko, V. A.

AU - Welling, D. T.

AU - Behlke, Rico

AU - Naemi Willer, Anna

PY - 2017

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N2 - A circuit analogy for magnetosphere-ionosphere current systems has two extremes for driversof ionospheric currents: ionospheric elec tric fields/voltages constant while current/conductivity vary—the“voltage generator”—and current constant while electric field/conductivity vary—the “current generator.”Statistical studies of ground magnetometer observations associated with dayside Transient High LatitudeCurrent Systems (THLCS) driven by similar mechanisms find contradictory results using this paradigm:some studies associate THLCS with voltage generators, others with current generators. We argue that mostof this contradiction arises from two assumptions used to interpret ground magnetometer observations:(1) measurements made at fixed position relative to the THLCS field-aligned current and (2) negligibleauroral precipitation contributions to ionospheric conductivity. We use observations and simulations toillustrate how these two assumptions substantially alter expectations for magnetic perturbations associatedwith either a current or a voltage generator. Our results demonstrate that before interpreting groundmagnetometer observations of THLCS in the context of current/voltage generators, the location of a groundmagnetometer station relative to the THLCS field-aligned current and the location of any auroral zoneconductivity enhancements need to be taken into account.

AB - A circuit analogy for magnetosphere-ionosphere current systems has two extremes for driversof ionospheric currents: ionospheric elec tric fields/voltages constant while current/conductivity vary—the“voltage generator”—and current constant while electric field/conductivity vary—the “current generator.”Statistical studies of ground magnetometer observations associated with dayside Transient High LatitudeCurrent Systems (THLCS) driven by similar mechanisms find contradictory results using this paradigm:some studies associate THLCS with voltage generators, others with current generators. We argue that mostof this contradiction arises from two assumptions used to interpret ground magnetometer observations:(1) measurements made at fixed position relative to the THLCS field-aligned current and (2) negligibleauroral precipitation contributions to ionospheric conductivity. We use observations and simulations toillustrate how these two assumptions substantially alter expectations for magnetic perturbations associatedwith either a current or a voltage generator. Our results demonstrate that before interpreting groundmagnetometer observations of THLCS in the context of current/voltage generators, the location of a groundmagnetometer station relative to the THLCS field-aligned current and the location of any auroral zoneconductivity enhancements need to be taken into account.

KW - Ground magnetometer

KW - TCV

KW - Sudden commencement;

KW - Current generator

KW - Voltage generator

KW - Magnetosphere-ionosphere coupling

U2 - 10.1002/2017JA024140

DO - 10.1002/2017JA024140

M3 - Journal article

VL - 122

SP - 7130

EP - 7141

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - 7

ER -