Motion of the dayside polar cap boundary during substorm cycles: II. Generation of poleward-moving events and polar cap patches by pulses in the magnetopause reconnection rate [PDF]
Annales Geophysicae, 2005 Using data from the EISCAT (European Incoherent Scatter) VHF and CUTLASS (Co-operative UK Twin-Located Auroral Sounding System) HF radars, we study the formation of ionospheric polar cap patches and their relationship to the magnetopause reconnection ...
M. Lockwood +9 more
doaj +1 more source
Recent Advances in Polar Cap Density Structure Research
, 2021 In the polar cap region, high-density ionospheric structures, such as the large-scale tongue-of-ionization and mesoscale polar cap patches, are frequently observed, which are of significant space weather concerns.
John C. Foster +5 more
core +1 more source
Localized structure in the cusp and high-latitude ionosphere: a modelling study [PDF]
Annales Geophysicae, 1999 The ionospheric signature of a flux transfer event (FTE) seen in EISCAT radar data has been used as the basis for a modelling study using a new numerical model of the high-latitude ionosphere developed at the University of Sheffield, UK. The evolution
H. F. Balmforth +2 more
doaj +1 more source
Polar Cap Patches Scaling Properties: Insights from Swarm Data
Remote Sensing, 2023 Among the effects of space weather, the degradation of air traffic communications and satellite-based navigation systems are the most notable. For this reason, it is of uttermost importance to understand the nature and origin of ionospheric irregularities that are at the base of the observed communication outages.
Roberta Tozzi +8 more
openaire +2 more sources
Multi-site observations of the association between aurora and plasma convection in the cusp/polar cap during a southeastward(By ~ |Bz|) IMF orientation [PDF]
Annales Geophysicae, 2003 In a case study we demonstrate the spatiotemporal structure of aurora and plasma convection in the cusp/polar cap when the interplanetary magnetic field (IMF) Bz < 0 and By ~ | Bz | (clock angle in GSM Y - Z plane: ~ 135°). This IMF orientation
P. E. Sandholt +8 more
doaj +1 more source
Observations of polar patches generated by solar wind Alfvén wave coupling to the dayside magnetosphere [PDF]
Annales Geophysicae, 1999 A long series of polar patches was observed by ionosondes and an all-sky imager during a disturbed period (Kp = 7- and IMF Bz < 0). The ionosondes measured electron densities of up to 9 × 1011 m-3 in the patch center, an increase above the density
P. Prikryl +6 more
doaj +1 more source
Space weather challenges of the polar cap ionosphere
Journal of Space Weather and Space Climate, 2013 This paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012.
Spogli Luca +5 more
doaj +1 more source
Sensors, 2020 It is of great significance for the global navigation satellite system (GNSS) service to detect the polar ionospheric total electron content (TEC) and its variations, particularly under disturbed ionosphere conditions, including different phases of solar
Hui Xi +6 more
doaj +1 more source
Method to locate the polar cap boundary in the nightside ionosphere and application to a substorm event [PDF]
, 2006 International audienceIn this paper we describe a new method to be used for the polar cap boundary (PCB) determination in the nightside ionosphere by using the EISCAT Svalbard radar (ESR) field-aligned measurements by the 42-m antenna and southward ...
A. T. Aikio +12 more
core +2 more sources
Association of Radio Polar Cap Brightening with Bright Patches and Coronal Holes [PDF]
The Astrophysical Journal, 2017 Abstract Radio-bright regions near the solar poles are frequently observed in Nobeyama Radioheliograph (NoRH) maps at 17 GHz, and often in association with coronal holes. However, the origin of these polar brightenings has not been established yet.
Caius L. Selhorst +5 more
openaire +2 more sources