Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Contribution of storm time substorms to the prompt electric field disturbances in the equatorial ionosphere

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA023754· OSTI ID:1402636
 [1];  [1];  [1];  [2];  [3];  [4]
  1. Physical Research Lab., Ahmedabad (India)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
  3. Kyushu Univ. (Japan)
  4. Nagoya Univ. (Japan)
+ Show Author Affiliations
This study tries to bring out the fact that storm time substorms can compete and at times significantly contribute to the geomagnetically disturbed time prompt penetration electric field effects on low and equatorial latitudes. Observations of unusual equatorial plasma drift data from Jicamarca Unattended Long-term Investigations of the Ionosphere and Atmosphere during two space weather events show that substorms can induce both eastward and westward penetration electric fields under steady southward interplanetary magnetic field (IMF Bz) conditions. During the first event on 2 January 2005, the enhancement of the daytime eastward electric field over Jicamarca due to substorm is found to be comparable with the Sq and interplanetary electric field (IEFy) generated electric fields combined. During the second event on 19 August 2006, the substorm is seen to weaken the daytime eastward field thereby inducing a westward field in spite of the absence of northward turning of IMF Bz (overshielding). The westward electric field perturbation in the absence of any overshielding events is observationally sparse and contrary to the earlier results. Further, the substorm-induced field is found to be strong enough to compete or almost nullify the effects of storm time IEFy fields. This study also shows quantitatively that at times substorm contribution to the disturbed time prompt electric fields can be significant and thus should be taken into consideration in evaluating penetration events over low latitudes.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
NASA; USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1402636
Report Number(s):
LA--UR-17-24825
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 5 Vol. 122; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

References (34)

Counter equatorial electrojet and overshielding after substorm onset: Global MHD simulation study journal September 2014
The equatorial electrojet during geomagnetic storms and substorms journal March 2015
Daytime plasma drifts in the equatorial lower ionosphere journal November 2015
Photoelectron-induced waves: A likely source of 150 km radar echoes and enhanced electron modes: PHOTOELECTRON-GENERATED 150 KM ECHOES journal April 2016
Discovery of two distinct types of equatorial 150 km radar echoes: 150 KM ECHO TYPES journal September 2013
Low Latitude Ionospheric Electrodynamics journal November 2010
Low Latitude Ionospheric Electrodynamics journal November 2010
Physical Processes Producing Magnetospheric Substorms and Magnetic Storms book January 1991
The spectral properties of low latitude daytime electric fields inferred from magnetometer observations journal July 2007
Penetration of the solar wind electric field into the magnetosphere/ionosphere system: PENETRATING SOLAR WIND ELECTRIC FIELD journal February 2003
Occurrence frequencies of IMF triggered and nontriggered substorms journal January 2003
Observations of dayside convection reduction leading to substorm onset journal January 2003
Equatorial counterelectrojets during substorms journal January 2003
Signatures for magnetospheric substorms in the geomagnetic field of dayside equatorial region: Origin of the ionospheric component journal January 2003
Periodic magnetospheric substorms during fluctuating interplanetary magnetic field B z journal January 2004
Daytime vertical and zonal velocities from 150-km echoes: Their relevance to F -region dynamics : EQUATORIAL DRIFTS FROM 150-KM ECHOES journal September 2004
A superposed epoch study of SuperDARN convection observations during substorms: SUPERPOSED SUBSTORM CONVECTION journal June 2007
Low-latitude ionospheric electric and magnetic field disturbances in response to solar wind pressure enhancements: IONOSPHERIC ELECTRIC AND MAGNETIC FIELD DISTURBANCES journal August 2008
Distinctive effects of interplanetary electric field and substorm on nighttime equatorial F layer: A case study journal January 2008
Seasonal and longitudinal dependence of equatorial disturbance vertical plasma drifts journal January 2008
Response of large-scale ionospheric convection to substorm expansion onsets: A case study: CONVECTION AND SUBSTORM ONSETS journal December 2008
Eastward electric field enhancement and geomagnetic positive bay in the dayside low-latitude ionosphere caused by magnetospheric substorms during sawtooth events journal January 2009
Westward ionospheric electric field perturbations on the dayside associated with substorm processes: WESTWARD ELECTRIC FIELD AND SUBSTORM journal December 2009
Polar-equatorial ionospheric currents driven by the region 2 field-aligned currents at the onset of substorms: REGION 2 FACS DURING SUBSTORMS journal September 2011
Statistical analysis of dayside equatorial ionospheric electric fields and electrojet currents produced by magnetospheric substorms during sawtooth events: EQUATORIAL ELECTROJET AND SUBSTORMS journal February 2012
The average ionospheric electrodynamics for the different substorm phases journal January 1996
Storm time dependence of equatorial disturbance dynamo zonal electric fields journal November 1997
An explanation for anomalous equatorial ionospheric electric fields associated with a northward turning of the interplanetary magnetic field journal April 1979
Equatorial electric fields during magnetically disturbed conditions 2. Implications of simultaneous auroral and equatorial measurements journal January 1979
On the latitudinal variations of the ionospheric electric field during magnetospheric disturbances journal November 1983
Spectral studies of the sources of ionospheric electric fields journal January 1987
Characteristics of Pi 2 magnetic pulsations observed at the CPMN stations: A review of the STEP results journal October 2001
Transmission of the electric fields to the low latitude ionosphere in the magnetosphere-ionosphere current circuit journal February 2016
Transmission of the electric fields to the low latitude ionosphere in the magnetosphere-ionosphere current circuit journal February 2016

Cited By (2)

Variable Responses of Equatorial Ionosphere During Undershielding and Overshielding Conditions journal February 2019
Significant Electric Field Perturbations in Low Latitude Ionosphere due to the Passage of Two Consecutive ICMEs During 6–8 September 2017 journal November 2019

Similar Records

Signatures of substorm related overshielding electric field at equatorial latitudes under steady southward IMF Bz during main phase of magnetic storm
Journal Article · Fri Apr 26 20:00:00 EDT 2019 · Advances in Space Research · OSTI ID:1557777
Role of IMF By in the prompt electric field disturbances over equatorial ionosphere during a space weather event
Journal Article · Fri Feb 03 19:00:00 EST 2017 · Journal of Geophysical Research. Space Physics · OSTI ID:1402608
An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition
Journal Article · Wed May 25 20:00:00 EDT 2016 · Journal of Geophysical Research. Space Physics · OSTI ID:1402593

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Heliospheric and Magnetospheric Physics