scholarly journals An analog forecast model for the high-latitude ionospheric potential based on assimilative mapping of ionospheric electrodynamics archives

Space Weather ◽  
2006 ◽  
Vol 4 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
E. A. Kihn ◽  
M. Zhizhin ◽  
Y. Kamide
Keyword(s):  
High Latitude ◽  
Forecast Model ◽  
Ionospheric Electrodynamics ◽  
Ionospheric Potential

scholarly journals Space Weather Modeling Capabilities Assessment: Auroral Precipitation and High‐Latitude Ionospheric Electrodynamics

Space Weather ◽  
2019 ◽  
Vol 17 (2) ◽  
pp. 212-215 ◽  
Author(s):  
Robert Robinson ◽  
Yongliang Zhang ◽  
Katherine Garcia‐Sage ◽  
Xiaohua Fang ◽  
Olga P. Verkhoglyadova ◽  
...  
Keyword(s):  
Space Weather ◽  
High Latitude ◽  
Ionospheric Electrodynamics ◽  
Weather Modeling

scholarly journals Towards understanding the electrodynamics of the 3-dimensional high-latitude ionosphere: present and future

2008 ◽  
Vol 26 (12) ◽  
pp. 3913-3932 ◽  
Author(s):  
O. Amm ◽  
A. Aruliah ◽  
S. C. Buchert ◽  
R. Fujii ◽  
J. W. Gjerloev ◽  
...  
Keyword(s):  
Data Analysis ◽  
High Latitude ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Neutral Atmosphere ◽  
3 Dimensional ◽  
Simulation Techniques ◽  
Ionospheric Electrodynamics ◽  
High Latitude Ionosphere ◽  
Ionospheric Modelling

Abstract. Traditionally, due to observational constraints, ionospheric modelling and data analysis techniques have been devised either in one dimension (e.g. along a single radar beam), or in two dimensions (e.g. over a network of magnetometers). With new upcoming missions like the Swarm ionospheric multi-satellite project, or the EISCAT 3-D project, the time has come to take into account variations in all three dimensions simultaneously, as they occur in the real ionosphere. The link between ionospheric electrodynamics and the neutral atmosphere circulation which has gained increasing interest in the recent years also intrinsically requires a truly 3-dimensional (3-D) description. In this paper, we identify five major science questions that need to be addressed by 3-D ionospheric modelling and data analysis. We briefly review what proceedings in the young field of 3-D ionospheric electrodynamics have been made in the past to address these selected question, and we outline how these issues can be addressed in the future with additional observations and/or improved data analysis and simulation techniques. Throughout the paper, we limit the discussion to high-latitude and mesoscale ionospheric electrodynamics, and to directly data-driven (not statistical) data analysis.

scholarly journals Statistical analysis of ionospheric potential patterns for isolated substorms and sawtooth events

2006 ◽  
Vol 24 (7) ◽  
pp. 1977-1991 ◽  
Author(s):  
X. Cai ◽  
C. R. Clauer ◽  
A. J. Ridley
Keyword(s):  
Statistical Analysis ◽  
Polar Region ◽  
Polar Cap ◽  
Superposed Epoch Analysis ◽  
The North ◽  
Ionospheric Electrodynamics ◽  
Energetic Particle Flux ◽  
Epoch Analysis ◽  
Periodic Form ◽  
Ionospheric Potential

Abstract. We present here results which contrast isolated substorms with individual sawtooth events. Sawtooth events are defined as quasi-periodic, large-amplitude oscillations in the energetic particle flux with a periodicity of 2–4 h observed at the geosynchronous orbit. Sawtooth events have several similarities to isolated substorms leading therefore, to different opinions about whether sawtooth events are just an intense periodic form of substorms or if they deserve a category of their own. To help resolve this, we examine the ionospheric potential patterns in the northern polar region for isolated substorms and sawtooth events using the assimilative mapping of ionospheric electrodynamics (AMIE) technique. First we show a statistical analysis of isolated substorm potential patterns. In order to examine the seasonal variation, isolated substorms are identified by mid-latitude positive bay in the north-south geomagnetic perturbation in each season, respectively. Superposed epoch analysis (SEA) is applied to obtain the typical polar potential patterns for each season. By examining the time evolution of the potential patterns and cross polar cap potential (CPCP) for isolated substorms during each season, we find only subtle seasonal variations in the results obtained using the AMIE analysis. This provides a basis for comparison with sawtooth events in the next step. From the averaged potential patterns of 213 isolated substorms and those of 184 individual sawtooth events, we find the sawtooth events show signatures similar to subtorms: the DP 1 potential pattern develops and dominates the polar region after the onset. However, the DP 1 potential cell of sawtooth events encompasses a larger area than that of isolated substorms. Moreover, the CPCP of sawtooth is stronger than that of isolated substorms. It is also shown that the sawtooth events displays greater variability between individual events than isolated substorms. We conclude that in terms of ionospheric electrodynamics, the sawtoothe events have features that are similar to those of isolates substorms, though larger in spatial extent and in magnitude.

Inverse procedure for high‐latitude ionospheric electrodynamics: Analysis of satellite‐borne magnetometer data

2015 ◽  
Vol 120 (6) ◽  
pp. 5241-5251 ◽  
Author(s):  
Tomoko Matsuo ◽  
Delores J. Knipp ◽  
Arthur D. Richmond ◽  
Liam Kilcommons ◽  
Brian J. Anderson
Keyword(s):  
High Latitude ◽  
Ionospheric Electrodynamics ◽  
Magnetometer Data ◽  
Inverse Procedure

Mapping high-latitude ionospheric electrodynamics with SuperDARN and AMPERE

2015 ◽  
Vol 120 (7) ◽  
pp. 5854-5870 ◽  
Author(s):  
E. D. P. Cousins ◽  
Tomoko Matsuo ◽  
A. D. Richmond
Keyword(s):  
High Latitude ◽  
Ionospheric Electrodynamics

Dayside ionospheric electrodynamics in association with high-latitude dayside aurora (HiLDA)

2021 ◽  
Author(s):  
Lei Cai ◽  
Anita Kullen ◽  
Tomas Karlson ◽  
Andris Vaivads ◽  
Yongliang Zhang
Keyword(s):  
High Latitude ◽  
Large Scale ◽  
Potential Drop ◽  
Polar Cap ◽  
Ionospheric Electrodynamics ◽  
Defense Meteorological Satellite Program ◽  
Current Region ◽  
Fine Structures ◽  
Field Aligned Current ◽  
Set Up

<p>The Defense Meteorological Satellite Program (DMSP) Special Sensor Ultraviolet Spectrographic Imager (SSUSI) has observed the large-scale high-latitude dayside aurora (HiLDA) during its long lifetime of hours. HiLDA has dynamical changes in form, size, location, and development of fine structures. However, the associated electrodynamics is not fully understood. In general, HiLDA occurs in the dayside polar cap during IMF By+ (By-) prevailing conditions in the sunlit northern (southern) hemisphere.  The prevailing conditions drive strong upward field-aligned current in the polar cap. Within the upward field-aligned current region, the field-aligned potential drop can be set up and accelerate the electrons, forming the monoenergetic electron precipitation (up to 10s keV) and producing HiLDA.</p><p> </p><p>This study investigates the ionospheric flows, currents, and auroral precipitation in association with HiLDA, benified from the simultaneous measurements from the DMSP satellites, the AMPERE project, and ground-based magnetometers and SuperDARN coherent radars. We will show HiLDA interacts with duskside oval-aligned arcs or transpolar arcs. The interactions are associated with the cusp and the dayside reconnection at the duskside flank/high latitudes. The reconnection produces strong dusk-dawn convection with flow shears in the polar cap, which generates the upward Region 0 current. We find that HiLDA is formed in the high-latitude part of the upward Region 0 current. We apply the Knight relation and identify the lobe electrons (< 0.3 cm<sup>-3</sup>) as the source of HiLDA. The fine structures revealed in the emission intensity of HiLDA may suggest the uneven distribution of the electron density in the high-latitude lobe.</p>

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