Analysis of the ionospheric cross polar cap potential drop using DMSP data during the National Space Weather Program study period

1998 ◽  
Vol 103 (A11) ◽  
pp. 26337-26347 ◽  
Author(s):  
Marc R. Hairston ◽  
R. A. Heelis ◽  
Frederick J. Rich
Keyword(s):  
Space Weather ◽  
Potential Drop ◽  
Polar Cap ◽  
National Space ◽  
Cross Polar Cap Potential

scholarly journals Statistical study of the effect of ULF fluctuations in the IMF on the cross polar cap potential drop for northward IMF

2011 ◽  
Vol 116 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
H.-J. Kim ◽  
L. Lyons ◽  
A. Boudouridis ◽  
V. Pilipenko ◽  
A. J. Ridley ◽  
...  
Keyword(s):  
Statistical Study ◽  
Potential Drop ◽  
Polar Cap ◽  
The Cross ◽  
Cross Polar Cap Potential ◽  
The Imf

Cross-polar cap potential drop and the energy coupling function

1984 ◽  
Vol 89 (A12) ◽  
pp. 11028 ◽  
Author(s):  
B.-H. Ahn ◽  
S.-I. Akasofu ◽  
Y. Kamide ◽  
J. H. King
Keyword(s):  
Potential Drop ◽  
Energy Coupling ◽  
Coupling Function ◽  
Polar Cap ◽  
Cross Polar Cap Potential

scholarly journals Deep Learning Models for Estimation of the SuperDARN Cross Polar Cap Potential

2020 ◽  
Vol 7 (8) ◽  
Author(s):  
Erxiao Liu ◽  
Hongqiao Hu ◽  
Jianjun Liu ◽  
Lei Qiao
Keyword(s):  
Deep Learning ◽  
Learning Models ◽  
Polar Cap ◽  
Cross Polar Cap Potential

scholarly journals Space weather challenges of the polar cap ionosphere

2013 ◽  
Vol 3 ◽  
pp. A02 ◽  
Author(s):  
Jøran Moen ◽  
Kjellmar Oksavik ◽  
Lucilla Alfonsi ◽  
Yvonne Daabakk ◽  
Vineenzo Romano ◽  
...  
Keyword(s):  
Space Weather ◽  
Polar Cap

Polar cap potential drop model (1981)

1992 ◽  
Vol 40 (4) ◽  
pp. 549-550
Author(s):  
P.H. Reiff ◽  
R.W. Spiro ◽  
T.W. Hill
Keyword(s):  
Potential Drop ◽  
Polar Cap

scholarly journals Reliable real-time Polar Cap (PC) indices for space weather monitoring and forecasts

2018 ◽  
Vol 8 ◽  
pp. A49 ◽  
Author(s):  
Peter Stauning
Keyword(s):  
Real Time ◽  
Space Weather ◽  
International Association ◽  
Magnetic Activity ◽  
Magnetic Data ◽  
Polar Cap ◽  
International Scientific Community ◽  
Order Of Magnitude ◽  
General Basis ◽  
Index Calculation

The Polar Cap (PC) indices were approved by the International Association for Geomagnetism and Aeromony (IAGA) by Resolution No. 3 (2013) noting that “IAGA … recommends use of the PC index by the international scientific community in its near-real time and definitive forms”. PC indices were made available in 2014 at the web portal http://pcindex.org holding near-real time as well as final index values. The near-real time PC index values are not permanently available. However, analyses of indices on basis of occasional downloads have detected differences between near-real time and final PC indices of up to 3.65 mV/m (Stauning, 2018b, Ann Geophys, 36, 621–631). At such differences, one or the other index may indicate (or hide) strong geomagnetic activity without justification in the actual conditions. The present work has disclosed the cause of observed large differences between real-time and final PC index values in the IAGA-endorsed versions. In addition, anticipated differences are derived on a general basis from the available basic magnetic data by using the index calculation procedures and calibration constants provided by the PC index suppliers. It is shown that corresponding or even larger anomalies are expected to be common during moderate to strong magnetic activity where the near-real time PC indices might otherwise prove very useful for space weather monitoring, e.g., for power grid protection. An alternative real-time PC index derivation scheme described here reduces the excessive differences between real-time and final PC index values by an order of magnitude.

scholarly journals A multi-satellite study of accelerated ionospheric ion beams above the polar cap

2006 ◽  
Vol 24 (6) ◽  
pp. 1665-1684 ◽  
Author(s):  
R. Maggiolo ◽  
J. A. Sauvaud ◽  
D. Fontaine ◽  
A. Teste ◽  
E. Grigorenko ◽  
...  
Keyword(s):  
Electric Field ◽  
Potential Drop ◽  
Auroral Zone ◽  
Ion Beams ◽  
Distribution Functions ◽  
Convection Velocity ◽  
Polar Cap ◽  
Ion Energy ◽  
Polar Cusp ◽  
Oxygen Ions

Abstract. This paper presents a study of nearly field-aligned outflowing ion beams observed on the Cluster satellites over the polar cap. Data are taken at geocentric radial distances of the order of 5–9 RE. The distinction is made between ion beams originating from the polar cusp/cleft and beams accelerated almost along the magnetic field line passing by the spacecraft. Polar cusp beams are characterized by nearly field-aligned proton and oxygen ions with an energy ratio EO+ / EH+, of the order of 3 to 4, due to the ion energy repartition inside the source and to the latitudinal extension of the source. Rapid variations in the outflowing ion energy are linked with pulses/modifications of the convection electric field. Cluster data allow one to show that these perturbations of the convection velocity and the associated ion structures propagate at the convection velocity. In contrast, polar cap local ion beams are characterized by field-aligned proton and oxygen ions with similar energies. These beams show the typical inverted V structures usually observed in the auroral zone and are associated with a quasi-static converging electric field indicative of a field-aligned electric field. The field-aligned potential drop fits well the ion energy profile. The simultaneous observation of precipitating electrons and upflowing ions of similar energies at the Cluster orbit indicates that the spacecraft are crossing the mid-altitude part of the acceleration region. In the polar cap, the parallel electric field can thus extend to altitudes higher than 5 Earth radii. A detailed analysis of the distribution functions shows that the ions are heated during their parallel acceleration and that energy is exchanged between H+ and O+. Furthermore, intense electrostatic waves are observed simultaneously. These observations could be due to an ion-ion two-stream instability.

Dependence of polar cap potential drop on interplanetary parameters

1981 ◽  
Vol 86 (A9) ◽  
pp. 7639-7648 ◽  
Author(s):  
P. H. Reiff ◽  
R. W. Spiro ◽  
T. W. Hill
Keyword(s):  
Potential Drop ◽  
Polar Cap
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