Determining the boundaries of the auroral oval from CHAMP field-aligned current signatures – Part 1
Reads0
Chats0
TLDR
In this paper, the first statistical study on auroral oval boundaries derived from small and medium-scale field-aligned currents (FACs) was presented, and the results were used for the first time.Abstract:
. In this paper we present the first statistical study on auroral oval boundaries derived from small- and medium-scale field-aligned currents (FACs,read more
Citations
More filters
Journal ArticleDOI
The MAGIC of CINEMA: first in-flight science results from a miniaturised anisotropic magnetoresistive magnetometer
Martin Archer,Martin Archer,Timothy S. Horbury,Patrick Brown,Jonathan Eastwood,T. Oddy,Barry J. Whiteside,John Sample +7 more
TL;DR: In this paper, the first in-flight results from a miniaturized anisotropic magnetoresistive space magnetometer, MAGIC (MAGnetometer from Imperial College), aboard the first CINEMA (CubeSat for Ions, Neutrals, Electrons and MAgnetic fields) spacecraft in low Earth orbit were presented.
Journal ArticleDOI
Stepping into the Equatorward Boundary of the Auroral Oval: preliminary results of multi scale statistical analysis
Massimo Materassi,Mirko Piersanti,Giuseppe Consolini,Piero Diego,Giulia D'Angelo,Igor Bertello,Antonio Cicone +6 more
TL;DR: In this paper, an adaptive local iterative filter (ALIF) was applied to the characterisation of plasma irregularities in the equatorward boundary of the auroral oval, where the data used are from the LEO satellite DEMETER (Detection of Electro−Magnetic Emissions Transmitted from Earthquake Regions).
Journal ArticleDOI
Plasma patches inside the polar cap and auroral oval: the impact on the spaceborne GPS receiver
TL;DR: In this article, the authors focused on plasma patches with very dense plasma in the southern hemisphere during the main phase of 2015 St. Patrick's Day storm and determined whether the satellites fly inside the auroral oval or not.
Journal ArticleDOI
Identification of potential precursors for the occurrence of Large-Scale Traveling Ionospheric Disturbances in a case study during September 2017
Arthur Amaral Ferreira,Arthur Amaral Ferreira,Claudia Borries,Chao Xiong,Renato Alves Borges,Jens Mielich,Daniel Kouba +6 more
Abstract: Traveling Ionospheric Disturbances (TIDs) reflect changes in the ionospheric electron density which are caused by atmospheric gravity waves. These changes in the electron density impact the functionality of different applications such as precise navigation and high-frequency geolocation. The Horizon 2020 project TechTIDE establishes a warning system for the occurrence of TIDs with the motivation to mitigate their impact on communication and navigation applications. This requires the identification of appropriate indicators for the generation of TIDs and for this purpose we investigate potential precursors for the TID occurrence. This paper presents a case study of the double main phase geomagnetic storm, starting from the night of 7th September and lasting until the end of 8th September 2017. Detrended Total Electron Content (TEC) derived from Global Navigation Satellite System (GNSS) measurements from more than 880 ground stations in Europe was used to identify the occurrence of different types of large scale traveling ionospheric disturbances (LSTIDs) propagating over the European sector. In this case study, LSTIDs were observed more frequently and with higher amplitude during periods of enhanced auroral activity, as indicated by increased electrojet index (IE) from the International Monitor for Auroral Geomagnetic Effects (IMAGE). Our investigation suggests that Joule heating due to the dissipation of Pedersen currents is the main contributor to the excitation of the observed LSTIDs. We observe that the LSTIDs are excited predominantly after strong ionospheric perturbations at high-latitudes. Ionospheric parameters including TEC gradients, the Along Arc TEC Rate (AATR) index and the Rate Of change of TEC index (ROTI) have been analysed for their suitability to serve as a precursor for LSTID occurrence in mid-latitude Europe, aiming for near real-time indication and warning of LSTID activity. The results of the presented case study suggest that the AATR index and TEC gradients are promising candidates for near real-time indication and warning of the LSTIDs occurrence in mid-latitude Europe since they have a close relation to the source mechanisms of LSTIDs during periods of increased auroral activity.
Journal ArticleDOI
Solar cycle evolution of ULF wave power in solar wind and on ground
TL;DR: In this article, the authors studied the solar cycle evolution of the ultra-low frequency (ULF) power in solar wind and on ground and found that ground ULF power follows the IMF power and solar wind speed particularly well during the declining phase of SC23.
References
More filters
Journal ArticleDOI
Large‐scale characteristics of field‐aligned currents associated with substorms
T. Iijima,T. A. Potemra +1 more
TL;DR: In this paper, the authors determined the statistical features of field-aligned currents during a large number of substorms from the magnetic field observations acquired with the Triad satellite, including the following: (1) the large-scale regions of fieldaligned currents determined previously by the authors (Iijima and Potemra, 1976a) persist during all phases of sub-storm activity, namely, region 1, located near the poleward boundary of the fieldaligned current region, and region 2, positioned near the equatorward boundary.
Journal ArticleDOI
Ionospheric Electrodynamics Using Magnetic Apex Coordinates.
TL;DR: In this paper, the equations of ionospheric electrodynamics are developed for a geomagnetic field of general configuration, with specific application to coordinate systems based on Magnetic Apex Coordinates.
Journal ArticleDOI
Field‐aligned currents in the dayside cusp observed by Triad
T. Iijima,T. A. Potemra +1 more
TL;DR: The characteristics of field-aligned currents at an altitude of 800 km in the dayside highlatitude region over the northern hemisphere were determined from the Triad satellite magnetometer data recorded at College, Alaska, from January 1973 to October 1974 as mentioned in this paper.
Journal ArticleDOI
A nearly universal solar wind-magnetosphere coupling function inferred from 10 magnetospheric state variables
TL;DR: In this article, the authors investigated whether one or a few coupling functions can represent best the interaction between the solar wind and the magnetosphere over a wide variety of magnetospheric activity.
Journal ArticleDOI
A statistical model of auroral electron precipitation
TL;DR: In this article, the average characteristics of auroral electron precipitation as a function of magnetic local time, magnetic latitude, and geomagnetic activity as measured by Kp were determined for each whole number value of Kp from 0 to 5 and for Kp ≥ 6.