Swarm Satellite Observations of the Effect of Prompt Penetration Electric Fields (PPEFs) on Plasma Density around Noon and Midnight Side of Low Latitudes during the 07-08 September 2017 Geomagnetic Storm

2021 ◽  
Author(s):  
Erdinç Timoçin
Keyword(s):  
Geomagnetic Storm ◽  
Electric Fields ◽  
Plasma Density ◽  
Satellite Observations ◽  
Low Latitudes ◽  
Swarm Satellite

scholarly journals Analysis of the positive ionospheric response to a moderate geomagnetic storm using a global numerical model

2000 ◽  
Vol 18 (4) ◽  
pp. 461-477 ◽  
Author(s):  
A. A. Namgaladze ◽  
M. Förster ◽  
R. Y. Yurik
Keyword(s):  
Numerical Model ◽  
Geomagnetic Storm ◽  
Electric Fields ◽  
Geomagnetic Storms ◽  
Atmospheric Composition ◽  
Reference Level ◽  
Quiet Time ◽  
Ionospheric Storm ◽  
Low Latitudes ◽  
Composition Changes

Abstract. Current theories of F-layer storms are discussed using numerical simulations with the Upper Atmosphere Model, a global self-consistent, time dependent numerical model of the thermosphere-ionosphere-plasmasphere-magnetosphere system including electrodynamical coupling effects. A case study of a moderate geomagnetic storm at low solar activity during the northern winter solstice exemplifies the complex storm phenomena. The study focuses on positive ionospheric storm effects in relation to thermospheric disturbances in general and thermospheric composition changes in particular. It investigates the dynamical effects of both neutral meridional winds and electric fields caused by the disturbance dynamo effect. The penetration of short-time electric fields of magnetospheric origin during storm intensification phases is shown for the first time in this model study. Comparisons of the calculated thermospheric composition changes with satellite observations of AE-C and ESRO-4 during storm time show a good agreement. The empirical MSISE90 model, however, is less consistent with the simulations. It does not show the equatorward propagation of the disturbances and predicts that they have a gentler latitudinal gradient. Both theoretical and experimental data reveal that although the ratio of [O]/[N2] at high latitudes decreases significantly during the magnetic storm compared with the quiet time level, at mid to low latitudes it does not increase (at fixed altitudes) above the quiet reference level. Meanwhile, the ionospheric storm is positive there. We conclude that the positive phase of the ionospheric storm is mainly due to uplifting of ionospheric F2-region plasma at mid latitudes and its equatorward movement at low latitudes along geomagnetic field lines caused by large-scale neutral wind circulation and the passage of travelling atmospheric disturbances (TADs). The calculated zonal electric field disturbances also help to create the positive ionospheric disturbances both at middle and low latitudes. Minor contributions arise from the general density enhancement of all constituents during geomagnetic storms, which favours ion production processes above ion losses at fixed height under day-light conditions.Key words: Atmospheric composition and structure (thermosphere · composition and chemistry) · Ionosphere (ionosphere · atmosphere interactions; modelling and forecasting)

scholarly journals Role of neutral wind and storm time electric fields inferred from the storm time ionization distribution at low latitudes: in-situ measurements by Indian satellite SROSS-C2

2005 ◽  
Vol 23 (10) ◽  
pp. 3289-3299 ◽  
Author(s):  
P. Subrahmanyam ◽  
A. R. Jain ◽  
L. Singh ◽  
S. C. Garg
Keyword(s):  
Geomagnetic Storm ◽  
Electric Fields ◽  
Geomagnetic Storms ◽  
Activity Period ◽  
High Solar Activity ◽  
Satellite Network ◽  
Neutral Winds ◽  
Weather Events ◽  
Low Latitudes ◽  
Time Changes

Abstract. Recently, there has been a renewal of interest in the study of the effects of solar weather events on the ionization redistribution and irregularity generation. The observed changes at low and equatorial latitudes are rather complex and are noted to be a function of location, the time of the storm onset and its intensity, and various other characteristics of the geomagnetic storms triggered by solar weather events. At these latitudes, the effects of geomagnetic storms are basically due to (a) direct penetration of the magnetospheric electric fields to low latitudes, (b) development of disturbance dynamo, (c) changes in atmospheric neutral winds at ionospheric level and (d) changes in neutral composition triggered by the storm time atmospheric heating. In the present study an attempt is made to further understand some of the observed storm time effects in terms of storm time changes in zonal electric fields and meridional neutral winds. For this purpose, observations made by the Retarding Potential Analyzer (RPA) payload on board the Indian satellite SROSS-C2 are examined for four prominent geomagnetic storm events that occurred during the high solar activity period of 1997-2000. Available simultaneous observations, from the GPS satellite network, are also used. The daytime passes of SROSS-C2 have been selected to examine the redistribution of ionization in the equatorial ionization anomaly (EIA) region. In general, EIA is observed to be weakened 12-24 h after the main phase onset (MPO) of the storm. The storm time behaviour inferred by SROSS-C2 and the GPS satellite network during the geomagnetic storm of 13 November 1998, for which simultaneous observations are available, is found to be consistent. Storm time changes in the delay of received GPS signals are noted to be ~1-3 m, which is a significant component of the total delay observed on a quiet day. An attempt is made to identify and delineate the effects of a) meridional neutral winds, b) the development of the ring currents and c) the disturbance dynamo electric fields on the low latitude ionization distribution. The weakening of the EIA is noted to be primarily due to the decrease in the eastward electric fields driving the equatorial fountain during the daytime. The meridional neutral winds are also noted to play an important role in redistribution of ionization in the EIA region. The present results demonstrate that storm time latitudinal distribution of ionization in this region can be better understood by taking into account the meridional winds in addition to E×B drifts.

scholarly journals Storming the Bastille: the effect of electric fields on the ionospheric F-layer

2010 ◽  
Vol 28 (4) ◽  
pp. 977-981 ◽  
Author(s):  
H. Rishbeth ◽  
R. A. Heelis ◽  
J. J. Makela ◽  
S. Basu
Keyword(s):  
Electric Fields ◽  
Plasma Density ◽  
Local Change ◽  
Important Process ◽  
Physical Processes ◽  
Net Production ◽  
F Region ◽  
Low Latitudes ◽  
Very High

Abstract. We discuss different phenomena occurring during ionospheric F-region storms that in principle might be caused by electric fields and point out challenges that must be faced when considering the physical processes at work. We consider the transport of plasma across many degrees of latitude at sub-auroral latitudes, the origin of patches of so-called "storm enhanced density" at high mid-latitudes, and the very high reported heights of the F2 peak at low latitudes. We discuss the role that electric fields might play in changing locally the net production of ionization as well as transporting it. We suggest that the local change in ionization production should be considered as a more important process for producing plasma density enhancements than transport from a more remote source of enhanced density.

scholarly journals Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storm

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Kumiko K. Hashimoto ◽  
Takashi Kikuchi ◽  
Ichiro Tomizawa ◽  
Keisuke Hosokawa ◽  
Jaroslav Chum ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Electric Fields ◽  
Low Latitudes

scholarly journals CM6: a comprehensive geomagnetic field model derived from both CHAMP and Swarm satellite observations

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Terence J. Sabaka ◽  
Lars Tøffner-Clausen ◽  
Nils Olsen ◽  
Christopher C. Finlay
Keyword(s):  
Geomagnetic Field ◽  
Field Model ◽  
Satellite Observations ◽  
Geomagnetic Field Model ◽  
Swarm Satellite

scholarly journals A spherical cap model of the geomagnetic field over southeast Asia from CHAMP and Swarm satellite observations

2021 ◽  
Vol 130 (1) ◽  
Author(s):  
Le Truong Thanh ◽  
Le Huy Minh ◽  
Vafi Doumbia ◽  
Christine Amory-Mazaudier ◽  
Nguyen Thanh Dung ◽  
...  
Keyword(s):  
Southeast Asia ◽  
Geomagnetic Field ◽  
Satellite Observations ◽  
Spherical Cap ◽  
Cap Model ◽  
Swarm Satellite

scholarly journals Equatorial E Region Electric Fields and Sporadic E Layer Responses to the Recovery Phase of the November 2004 Geomagnetic Storm

2017 ◽  
Vol 122 (12) ◽  
pp. 12,517-12,533 ◽  
Author(s):  
J. Moro ◽  
L. C. A. Resende ◽  
C. M. Denardini ◽  
J. Xu ◽  
I. S. Batista ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Electric Fields ◽  
Recovery Phase ◽  
E Region ◽  
Sporadic E Layer ◽  
Sporadic E

scholarly journals Energetic electron enhancements under the radiation belt (<i>L</i> < 1.2) during a non-storm interval on 1 August 2008

2019 ◽  
Vol 37 (6) ◽  
pp. 1223-1241 ◽  
Author(s):  
Alla V. Suvorova ◽  
Alexei V. Dmitriev ◽  
Vladimir A. Parkhomov
Keyword(s):  
Electric Fields ◽  
Radiation Belt ◽  
Energetic Electron ◽  
Plasma Pressure ◽  
Plasma Jets ◽  
Unusual Event ◽  
Hot Plasma ◽  
Low Latitudes ◽  
Pressure Pulses ◽  
Dawn Sector

Abstract. An unusual event of deep injections of >30 keV electrons from the radiation belt to low L shells (L<1.2) in the midnight–dawn sector was found from NOAA/POES observations during quiet geomagnetic conditions on 1 August 2008. Using THEMIS observations in front of the bow shock, we found transient foreshock conditions and interplanetary magnetic field (IMF) discontinuities passing the subsolar region at that time. These conditions resulted in generation of plasma pressure pulses and fast plasma jets observed by THEMIS, respectively, in the foreshock and magnetosheath. Signatures of interactions of pressure pulses and jets with the magnetopause were found in THEMIS and GOES measurements in the dayside magnetosphere and ground magnetogram records from INTERMAGNET. The jets produce penetration of hot magnetosheath plasma into the dayside magnetosphere, as was observed by the THEMIS probes after approaching the magnetopause. High-latitude precipitations of the hot plasma were observed by NOAA/POES satellites on the dayside. The precipitations preceded the >30 keV electron injections at low latitudes. We propose a scenario of possible association between the phenomena observed. However, the scenario cannot be firmly supported because of the lack of experimental data on electric fields at the heights of electron injections. This should be a subject of future experiments.

scholarly journals Total electron content responses to HILDCAAs and geomagnetic storms over South America

2017 ◽  
Vol 35 (6) ◽  
pp. 1309-1326 ◽  
Author(s):  
Patricia Mara de Siqueira Negreti ◽  
Eurico Rodrigues de Paula ◽  
Claudia Maria Nicoli Candido
Keyword(s):  
Solar Wind ◽  
South America ◽  
Total Electron Content ◽  
Geomagnetic Storm ◽  
Electric Fields ◽  
Geomagnetic Storms ◽  
Time Variability ◽  
Electron Content ◽  
Quiet Time ◽  
Total Electron

Abstract. Total electron content (TEC) is extensively used to monitor the ionospheric behavior under geomagnetically quiet and disturbed conditions. This subject is of greatest importance for space weather applications. Under disturbed conditions the two main sources of electric fields, which are responsible for changes in the plasma drifts and for current perturbations, are the short-lived prompt penetration electric fields (PPEFs) and the longer-lasting ionospheric disturbance dynamo (DD) electric fields. Both mechanisms modulate the TEC around the globe and the equatorial ionization anomaly (EIA) at low latitudes. In this work we computed vertical absolute TEC over the low latitude of South America. The analysis was performed considering HILDCAA (high-intensity, long-duration, continuous auroral electrojet (AE) activity) events and geomagnetic storms. The characteristics of storm-time TEC and HILDCAA-associated TEC will be presented and discussed. For both case studies presented in this work (March and August 2013) the HILDCAA event follows a geomagnetic storm, and then a global scenario of geomagnetic disturbances will be discussed. Solar wind parameters, geomagnetic indices, O ∕ N2 ratios retrieved by GUVI instrument onboard the TIMED satellite and TEC observations will be analyzed and discussed. Data from the RBMC/IBGE (Brazil) and IGS GNSS networks were used to calculate TEC over South America. We show that a HILDCAA event may generate larger TEC differences compared to the TEC observed during the main phase of the precedent geomagnetic storm; thus, a HILDCAA event may be more effective for ionospheric response in comparison to moderate geomagnetic storms, considering the seasonal conditions. During the August HILDCAA event, TEC enhancements from  ∼  25 to 80 % (compared to quiet time) were observed. These enhancements are much higher than the quiet-time variability observed in the ionosphere. We show that ionosphere is quite sensitive to solar wind forcing and considering the events studied here, this was the most important source of ionospheric responses. Furthermore, the most important source of TEC changes were the long-lasting PPEFs observed on August 2013, during the HILDCAA event. The importance of this study relies on the peculiarity of the region analyzed characterized by high declination angle and ionospheric gradients which are responsible for creating a complex response during disturbed periods.

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