Driver of the Positive Ionospheric Storm over the South American Sector during 4 November 2021 Geomagnetic Storm

During geomagnetic storms, ionospheric storms can be driven by several mechanisms. Observations performed using ground- and space-based instruments were used to reveal the driver of the positive ionospheric storm over the South American sector during the 4 November 2021 geomagnetic storm. The positive storm appeared from 10:30 UT to 18:00 UT and covered the region from 40°S to 20°N. The maximum magnitudes of TEC (Total Electron Content) enhancement and relative TEC enhancement were about 20 TECU and 100%, respectively. Defense Meteorological Satellite Program (DMSP) also observed a significant electron density increase over South America and the eastern Pacific Ocean. In the meantime, about 50% ∑O/N2 enhancement was observed by the Global-scale Observations of the Limb and Disk (GOLD) satellite at low latitudes. Ionosonde observations (AS00Q and CAJ2M) registered an ~80 km uplift in F2 peak height (HmF2) and a prominent F2 peak electron density (NmF2) increase ~3 h after the uplift. A prominent enhancement in the cross-polar cap potential (CPCP) in the southern hemisphere was also observed by Super Dual Auroral Radar Network (SuperDARN) one hour earlier than the HmF2 uplift. Measurements of the Ionospheric Connection Explorer satellite (ICON) showed that the outward E×B drift was enhanced significantly and that the horizontal ion drift was poleward. According to the ICON ion drift observations, the HmF2 uplift was caused by an electric field rather than equatorward neutral wind. We propose that the enhanced eastward electric field dominated the positive ionospheric storm and that the thermospheric composition variation may have also contributed.

[1]  Shunrong Zhang,et al.  Disturbance Neutral Winds Effects on the Ionospheric Strip‐Like Bulge at Lower‐Middle Latitudes , 2022, Journal of Geophysical Research: Space Physics.

[2]  Wenbin Wang,et al.  The Effects of IMF By on the Middle Thermosphere During a Geomagnetically “Quiet” Period at Solar Minimum , 2022, Journal of Geophysical Research: Space Physics.

[3]  R. Fleury,et al.  Signatures of Equatorial Plasma Bubbles and Ionospheric Scintillations from Magnetometer and GNSS Observations in the Indian Longitudes during the Space Weather Events of Early September 2017 , 2022, Remote. Sens..

[4]  W. Younas,et al.  Middle and low latitudes hemispheric asymmetries in ∑O/N2 and TEC during intense magnetic storms of Solar Cycle 24 , 2021, Advances in Space Research.

[5]  S. Solomon,et al.  Investigation of a Neutral “Tongue” Observed by GOLD During the Geomagnetic Storm on May 11, 2019 , 2021, Journal of Geophysical Research: Space Physics.

[6]  S. Solomon,et al.  Observation of Postsunset OI 135.6 nm Radiance Enhancement Over South America by the GOLD Mission , 2021, Journal of Geophysical Research: Space Physics.

[7]  P. Mukhtarov,et al.  Response of the electron density profiles to geomagnetic disturbances in January 2005 , 2019, Studia Geophysica et Geodaetica.

[8]  M. Lester,et al.  Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars , 2019, Progress in Earth and Planetary Science.

[9]  W R Coley,et al.  Study of the Equatorial and Low‐Latitude Electrodynamic and Ionospheric Disturbances During the 22–23 June 2015 Geomagnetic Storm Using Ground‐Based and Spaceborne Techniques , 2018, Journal of geophysical research. Space physics.

[10]  T. J. Immel,et al.  The Ionospheric Connection Explorer Mission: Mission Goals and Design , 2018, Space science reviews.

[11]  R. Heelis,et al.  Ion Velocity Measurements for the Ionospheric Connections Explorer , 2017, Space Science Reviews.

[12]  I. Batista,et al.  Electrodynamic disturbances in the Brazilian equatorial and low‐latitude ionosphere on St. Patrick's Day storm of 17 March 2015 , 2017 .

[13]  T. Yokoyama,et al.  Conjugate hemisphere ionospheric response to the St. Patrick's Day storms of 2013 and 2015 in the 100°E longitude sector , 2016 .

[14]  K. Venkatesh,et al.  Positive and negative GPS‐TEC ionospheric storm effects during the extreme space weather event of March 2015 over the Brazilian sector , 2016 .

[15]  T. Kikuchi,et al.  Transmission of the electric fields to the low latitude ionosphere in the magnetosphere-ionosphere current circuit , 2016, Geoscience Letters.

[16]  P. K. Rajesh,et al.  Morphology of midlatitude electron density enhancement using total electron content measurements , 2016 .

[17]  Wenbin Wang,et al.  Profiles of ionospheric storm‐enhanced density during the 17 March 2015 great storm , 2015 .

[18]  B. Lovell,et al.  Positive and negative ionospheric storms occurring during the 15 May 2005 geomagnetic superstorm , 2015 .

[19]  Yu. V. Yasyukevich,et al.  Geomagnetic storms, super‐storms, and their impacts on GPS‐based navigation systems , 2014 .

[20]  A. Coster,et al.  Ionospheric and thermospheric variations associated with prompt penetration electric fields , 2012 .

[21]  J. Liu,et al.  Statistics of geomagnetic storms and ionospheric storms at low and mid latitudes in two solar cycles , 2011 .

[22]  Keith M. Groves,et al.  Specification of the occurrence of equatorial ionospheric scintillations during the main phase of large magnetic storms within solar cycle 23 , 2010 .

[23]  S. Solomon,et al.  Ionospheric response to the initial phase of geomagnetic storms: Common features , 2010 .

[24]  S. Kawamura,et al.  A physical mechanism of positive ionospheric storms at low latitudes and midlatitudes , 2010 .

[25]  R. Roble,et al.  A dayside ionospheric positive storm phase driven by neutral winds , 2008 .

[26]  T. Kikuchi,et al.  Penetration of magnetospheric electric fields to the equator during a geomagnetic storm , 2008 .

[27]  S. Basu,et al.  Large magnetic storm-induced nighttime ionospheric flows at midlatitudes and their impacts on GPS-based navigation systems , 2008 .

[28]  Paul M. Kintner,et al.  GPS and ionospheric scintillations , 2007 .

[29]  S. Sazykin,et al.  Penetration electric fields: Efficiency and characteristic time scale , 2007 .

[30]  Larry J. Paxton,et al.  Observations of a positive storm phase on September 10, 2005 , 2006 .

[31]  M. Kelley,et al.  Long‐duration penetration of the interplanetary electric field to the low‐latitude ionosphere during the main phase of magnetic storms , 2005 .

[32]  Volker Wilken,et al.  Ionospheric space weather effects monitored by simultaneous ground and space based GNSS signals , 2005 .

[33]  S. Basu,et al.  Effect of magnetic activity on the dynamics of equatorial F region irregularities , 2002 .

[34]  I. Tsagouri,et al.  Positive and negative ionospheric disturbances at middle latitudes during geomagnetic storms , 2000 .

[35]  T. Killeen,et al.  Large enhancements in the O/N2 ratio in the evening sector of the winter hemisphere during geomagnetic storms , 1995 .

[36]  T. B. Jones,et al.  DARN/SuperDARN , 1995 .

[37]  Timothy Fuller-Rowell,et al.  Response of the thermosphere and ionosphere to geomagnetic storms , 1994 .

[38]  G. W. Prölss.  Common origin of positive ionospheric storms at middle latitudes and the geomagnetic activity effect at low latitudes , 1993 .

[39]  B. Fejer,et al.  An explanation for anomalous equatorial ionospheric electric fields associated with a northward turning of the interplanetary magnetic field , 1979 .