GPS scintillation and irregularities at the front of an ionization tongue in the nightside polar ionosphere

Meeren, Christer van der; Oksavik, K.; Lorentzen, D. A.; Moen, J.; Romano, Vincenzo

doi:10.1002/2014ja020114

Cited by 65 publications

(64 citation statements)

References 102 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The convecting patches develop intermediate-scale irregularities by action of the gradient-drift instability mechanism (Kersley et al 1995), that is also confirmed by numerical simulation (Gondarenko and Guzdar 2004). Because of the steep plasma density gradients and irregularities at their edges (Weber et al 1986), the TOI structure and polar cap patches can be detected with GPS measurements (e.g., Aarons 1997;Noja et al 2013;van der Meeren et al 2014). …”

Section: Resultsmentioning

confidence: 57%

Dependence of the high-latitude plasma irregularities on the auroral activity indices: a case study of 17 March 2015 geomagnetic storm

Cherniak

Zakharenkova

2015

Earth Planet Sp

View full text Add to dashboard Cite

The magnetosphere substorm plays a crucial role in the solar wind energy dissipation into the ionosphere. We report on the intensity of the high-latitude ionospheric irregularities during one of the largest storms of the current solar cycle-the St. Patrick's Day storm of 17 March 2015. The database of more than 2500 ground-based Global Positioning System (GPS) receivers was used to estimate the irregularities occurrence and dynamics over the auroral region of the Northern Hemisphere. We analyze the dependence of the GPS-detected ionospheric irregularities on the auroral activity. The development and intensity of the high-latitude irregularities during this geomagnetic storm reveal a high correlation with the auroral hemispheric power and auroral electrojet indices (0.84 and 0.79, respectively). Besides the ionospheric irregularities caused by particle precipitation inside the polar cap region, evidences of other irregularities related to the storm enhanced density (SED), formed at mid-latitudes and its further transportation in the form of tongue of ionization (TOI) towards and across the polar cap, are presented. We highlight the importance accounting contribution of ionospheric irregularities not directly related with particle precipitation in overall irregularities distribution and intensity.

show abstract

Section: Resultsmentioning

confidence: 57%

Dependence of the high-latitude plasma irregularities on the auroral activity indices: a case study of 17 March 2015 geomagnetic storm

Cherniak

Zakharenkova

2015

Earth Planet Sp

View full text Add to dashboard Cite

show abstract

“…This is mostly clear in the high-resolution (1s) σ ϕ data. The carrier phase measurement was detrended by first subtracting a fourth-order polynomial fit from the raw phase and then filtering the remainder using a high-pass Butterworth filter with a cutoff frequency of 0.2 Hz (van der Meeren et al, 2014). However, during the late phase of the RFE, the GPS phase scintillations enhanced abruptly.…”

Section: Bzmentioning

confidence: 99%

Simultaneous Rocket and Scintillation Observations of Plasma Irregularities Associated With a Reversed Flow Event in the Cusp Ionosphere

et al. 2019

Self Cite

View full text Add to dashboard Cite

We present an overview of the ionospheric conditions during the launch of the Investigation of Cusp Irregularities 3 (ICI‐3) sounding rocket. ICI‐3 was launched from Ny‐Ålesund, Svalbard, at 7:21.31 UT on 3 December 2011. The objective of ICI‐3 was to intersect the reversed flow event (RFE), which is thought to be an important source for the rapid development of ionospheric irregularities in the cusp ionosphere. The interplanetary magnetic field was characterized by strongly negative Bz and weakly negative By. The EISCAT Svalbard radar (ESR) 32‐m beam was operating in a fast azimuth sweep mode between 180° (south) and 300° (northwest) at an elevation angle of 30°. The ESR observed a series of RFEs as westward flow channels that were opposed to the large‐scale eastward plasma flow in the prenoon sector. ICI‐3 intersected the first RFE in the ESR field of view and observed flow structures that were consistent with the ESR observations. Furthermore, ICI‐3 revealed finer‐scale flow structures inside the RFE. The high‐resolution electron density data show intense fluctuations at all scales throughout the RFE. The ionospheric pierce point of the GPS satellite PRN30, which was tracked at Hornsund, intersected the RFE at the same time. The GPS scintillation data show moderate phase scintillations and weak amplitude scintillations. A comparison of the power spectra reveals a good match between the ground‐based GPS carrier phase measurements and the spectral slope of the in situ electron density data in the lower frequency range. It demonstrates the possibility of modelling GPS scintillations from high‐resolution in situ electron density data.

show abstract

“…1). The GISTM receiver is a GSV 4004B model (Van Dierendonck and Arbesser-Rastburg, 2004), which is a NovAtel OEM4 dual-frequency receiver with special firmware specifically configured to measure and record power and phase of the GPS L1 signal at a high sampling rate (50 Hz). Each receiver is capable of tracking and reporting scintillation and total electron content (TEC) measurements simultaneously from up to 10 GPS satellites in view.…”

Section: Instruments and Datamentioning

confidence: 99%

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 1: The North American sector

et al. 2015

View full text Add to dashboard Cite

Abstract. The interval of geomagnetic storms of 7-17 March 2012 was selected at the Climate and Weather of the Sun-Earth System (CAWSES) II Workshop for group study of space weather effects during the ascending phase of solar cycle 24 (Tsurutani et al., 2014). The high-latitude ionospheric response to a series of storms is studied using arrays of GPS receivers, HF radars, ionosondes, riometers, magnetometers, and auroral imagers focusing on GPS phase scintillation. Four geomagnetic storms showed varied responses to solar wind conditions characterized by the interplanetary magnetic field (IMF) and solar wind dynamic pressure. As a function of magnetic latitude and magnetic local time, regions of enhanced scintillation are identified in the context of coupling processes between the solar wind and the magnetosphere-ionosphere system. Large southward IMF and high solar wind dynamic pressure resulted in the strongest scintillation in the nightside auroral oval. Scintillation occurrence was correlated with ground magnetic field perturbations and riometer absorption enhancements, and collocated with mapped auroral emission. During periods of southward IMF, scintillation was also collocated with ionospheric convection in the expanded dawn and dusk cells, with the antisunward convection in the polar cap and with a tongue of ionization fractured into patches. In contrast, large northward IMF combined with a strong solar wind dynamic pressure pulse was followed by scintillation caused by transpolar arcs in the polar cap.

show abstract

GPS scintillation and irregularities at the front of an ionization tongue in the nightside polar ionosphere

Cited by 65 publications

References 102 publications

Dependence of the high-latitude plasma irregularities on the auroral activity indices: a case study of 17 March 2015 geomagnetic storm

Dependence of the high-latitude plasma irregularities on the auroral activity indices: a case study of 17 March 2015 geomagnetic storm

Simultaneous Rocket and Scintillation Observations of Plasma Irregularities Associated With a Reversed Flow Event in the Cusp Ionosphere

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 1: The North American sector

Contact Info

Product

Resources

About