DEMETER satellite observations of plasma irregularities in the topside ionosphere at low, middle, and sub-auroral latitudes and their dependence on magnetic storms

2008 ◽  
pp. 297-310 ◽  
Author(s):  
Robert F. Pfaff ◽  
Carmen Liebrecht ◽  
Jean-Jacques Berthelier ◽  
Michel Malingre ◽  
Michel Parrot ◽  
...  
Keyword(s):  
Magnetic Storms ◽  
Satellite Observations ◽  
Topside Ionosphere ◽  
Plasma Irregularities ◽  
Demeter Satellite

The Energetic Electron Response to Magnetic Storms: HEO Satellite Observations

2004 ◽  
Author(s):  
J. F. Fennell ◽  
J. B. Blake ◽  
R. Friedel ◽  
S. Kanekal
Keyword(s):  
Energetic Electron ◽  
Magnetic Storms ◽  
Satellite Observations

scholarly journals Concentration of ions in the topside ionosphere as measured onboard the DEMETER satellite: Morphology and dependence on solar and geomagnetic activity

2012 ◽  
Vol 50 (2) ◽  
pp. 103-115 ◽  
Author(s):  
V. A. Gladyshev ◽  
A. Yu. Shchekotov ◽  
N. V. Yagova ◽  
J. -J. Berthelier ◽  
M. Parrot ◽  
...  
Keyword(s):  
Geomagnetic Activity ◽  
Topside Ionosphere ◽  
Demeter Satellite ◽  
Concentration Of Ions

scholarly journals Nightside ULF Waves Observed in the Topside Ionosphere by the DEMETER Satellite

2018 ◽  
Vol 123 (9) ◽  
pp. 7726-7739 ◽  
Author(s):  
X. Y. Ouyang ◽  
Q. G. Zong ◽  
J. Bortnik ◽  
Y. F. Wang ◽  
P. J. Chi ◽  
...  
Keyword(s):  
Topside Ionosphere ◽  
Ulf Waves ◽  
Demeter Satellite

scholarly journals New observations of electromagnetic harmonic ELF emissions in the ionosphere by the DEMETER satellite during large magnetic storms

2006 ◽  
Vol 111 (A8) ◽  
Author(s):  
M. Parrot ◽  
A. Buzzi ◽  
O. Santolík ◽  
J. J. Berthelier ◽  
J. A. Sauvaud ◽  
...  
Keyword(s):  
Magnetic Storms ◽  
Demeter Satellite

scholarly journals DEMETER satellite observations of lightning-induced electron precipitation

2007 ◽  
Vol 34 (7) ◽  
Author(s):  
U. S. Inan ◽  
D. Piddyachiy ◽  
W. B. Peter ◽  
J. A. Sauvaud ◽  
M. Parrot
Keyword(s):  
Satellite Observations ◽  
Electron Precipitation ◽  
Demeter Satellite

Dynamical Complexity of Magnetic Storms at Swarm Altitudes Using Entropy Measures

2020 ◽  
Author(s):  
Constantinos Papadimitriou ◽  
Georgios Balasis ◽  
Adamantia-Zoe Boutsi ◽  
Omiros GIannakis ◽  
Anastasios Anastasiadis ◽  
...  
Keyword(s):  
Information Theory ◽  
Time Series ◽  
Magnetic Storms ◽  
Topside Ionosphere ◽  
Dynamical Response ◽  
Electromagnetic Environment ◽  
Dynamical Complexity ◽  
Coupling System ◽  
Entropy Measures ◽  
Earth’S System

<p>Recently, many novel concepts originated in dynamical systems or information theory have been developed, partly motivated by specific research questions linked to geosciences, and found a variety of different applications. This continuously extending toolbox of nonlinear time series analysis highlights the importance of the dynamical complexity to understand the behavior of the complex solar wind – magnetosphere – ionosphere - thermosphere coupling system and its components. Here, we propose to apply such new approaches, mainly a series of entropy methods to the time series of the Earth's magnetic field measured by the Swarm constellation. Swarm is an ESA mission launched on November 22, 2013, comprising three satellites at low Earth polar orbits. The mission delivers data that provide new insight into the Earth's system by improving our understanding of the Earth's interior as well as the near-Earth electromagnetic environment. We show successful applications of methods originated in information theory to quantitatively studying complexity in the dynamical response of the topside ionosphere, at Swarm altitudes, focusing on the most intense magnetic storms of the present solar cycle.</p>

Auroral ion composition during large magnetic storms

1992 ◽  
Vol 70 (7) ◽  
pp. 500-509 ◽  
Author(s):  
A. W. Yau ◽  
B. A. Whalen
Keyword(s):  
Molecular Nitrogen ◽  
Magnetic Storms ◽  
Direct Result ◽  
Mass Composition ◽  
Topside Ionosphere ◽  
Molecular Formula ◽  
Ion Composition ◽  
Dominant Component ◽  
F Region ◽  
Ion Species

Ion-composition measurements from the suprathermal mass spectrometer (SMS) on AKEBONO (EXOS-D) during large magnetic storms (minimum Dst < −50 nT) reveal substantial changes in the mass composition of the auroral ionosphere. At quiet times, H+ and O+ ions dominate the high-altitude (> 1000 km) polar (Λ > 70°) ionosphere, and the minor-ion species (He+, N+, and O++) typically constitute about 10% of the total ion population: N+/O+ ≈ 0.05–0.1 and O++/O+ ≈ 0.1–0.2. During magnetic storms, the relative abundance of minor ions increase substantially, and N+ becomes a significant, at times dominant, component. During the main phase of large storms, the N+/O+ ratio reaches peak values of unity in the dayside. Likewise, the peak O++/O+ ratio reaches 0.4–0.5 at storm time. In addition, molecular [Formula: see text] and NO+ ions are occasionally present, and constitute ~5% of the total ion flux. The observed ions typically have energies of 5–20 eV/q, and are moving upward along the field line. They are believed to originate from the topside ionosphere. The increased abundance of N+ ions during large magnetic storms is believed to be a direct result of the increase in molecular nitrogen density in the F-region and topside ionosphere due to thermospheric heating in the presence of prolonged auroral activity. This implies that N+ ions may possibly be the dominant plasma component in the magnetosphere during very large magnetic storms.

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