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Title: Mid-latitude ionospheric irregularity spectral density as determined by ground-based GPS receiver networks

Abstract

In this paper, we present a new technique to experimentally measure the spatial spectrum of ionospheric disturbances in the spatial scale regime of 40 – 200 km. This technique produces a 2-dimensional (2-D) spectrum for each time snapshot over two dense GPS receiver networks (GEONET in Japan and PBO in the Western U.S.). Because this technique created the spectrum from an instantaneous time snapshot, no assumptions are needed about the speed of ionospheric irregularities. We examine spectra from three days: one with an intense geomagnetic storm, one with significant lightning activity, and one quiet day. Radial slices along the 2-D spectra provide 1-dimensional spectra that can be fit to a power law to quantify the steepness of the fall-off in the spatial scale sizes. Continuous data of this type in a stationary location allows monitoring the variability in the 2-D spectrum over the course of a day and comparing between days, as shown here, or even over a year or many years. We find that the spectra are highly variable over the course of a day and between the two selected regions of Japan and the Western U.S. When strong travelling ionospheric disturbances (TIDs) are present, the 2-D spectra providemore » information about the direction of propagation of the TIDs. We compare the TID propagation direction with horizontal wind directions from the Horizontal Wind Model. Finally, TID direction is correlated with the horizontal wind direction on all days, strongly indicating that the primary source of the TIDs measured by this technique is tropospheric.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Boston College, Newton, MA (United States). Inst. for Scientific Research
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Electrical Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1440449
Alternate Identifier(s):
OSTI ID: 1441015
Report Number(s):
LA-UR-18-21184
Journal ID: ISSN 2169-9380; TRN: US1900738
Grant/Contract Number:  
AC52-06NA25396; 20160231ER
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; ionosphere, GPS network, scintillation, traveling ionospheric disturbances

Citation Formats

Lay, Erin H., Parker, Peter A., Light, Max, Carrano, Charles S., Debchoudhury, Shantanab, and Haaser, Robert A. Mid-latitude ionospheric irregularity spectral density as determined by ground-based GPS receiver networks. United States: N. p., 2018. Web. doi:10.1029/2018JA025364.
Lay, Erin H., Parker, Peter A., Light, Max, Carrano, Charles S., Debchoudhury, Shantanab, & Haaser, Robert A. Mid-latitude ionospheric irregularity spectral density as determined by ground-based GPS receiver networks. United States. doi:10.1029/2018JA025364.
Lay, Erin H., Parker, Peter A., Light, Max, Carrano, Charles S., Debchoudhury, Shantanab, and Haaser, Robert A. Tue . "Mid-latitude ionospheric irregularity spectral density as determined by ground-based GPS receiver networks". United States. doi:10.1029/2018JA025364. https://www.osti.gov/servlets/purl/1440449.
@article{osti_1440449,
title = {Mid-latitude ionospheric irregularity spectral density as determined by ground-based GPS receiver networks},
author = {Lay, Erin H. and Parker, Peter A. and Light, Max and Carrano, Charles S. and Debchoudhury, Shantanab and Haaser, Robert A.},
abstractNote = {In this paper, we present a new technique to experimentally measure the spatial spectrum of ionospheric disturbances in the spatial scale regime of 40 – 200 km. This technique produces a 2-dimensional (2-D) spectrum for each time snapshot over two dense GPS receiver networks (GEONET in Japan and PBO in the Western U.S.). Because this technique created the spectrum from an instantaneous time snapshot, no assumptions are needed about the speed of ionospheric irregularities. We examine spectra from three days: one with an intense geomagnetic storm, one with significant lightning activity, and one quiet day. Radial slices along the 2-D spectra provide 1-dimensional spectra that can be fit to a power law to quantify the steepness of the fall-off in the spatial scale sizes. Continuous data of this type in a stationary location allows monitoring the variability in the 2-D spectrum over the course of a day and comparing between days, as shown here, or even over a year or many years. We find that the spectra are highly variable over the course of a day and between the two selected regions of Japan and the Western U.S. When strong travelling ionospheric disturbances (TIDs) are present, the 2-D spectra provide information about the direction of propagation of the TIDs. We compare the TID propagation direction with horizontal wind directions from the Horizontal Wind Model. Finally, TID direction is correlated with the horizontal wind direction on all days, strongly indicating that the primary source of the TIDs measured by this technique is tropospheric.},
doi = {10.1029/2018JA025364},
journal = {Journal of Geophysical Research. Space Physics},
number = 6,
volume = 123,
place = {United States},
year = {2018},
month = {5}
}

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Figures / Tables:

Figure 1 Figure 1: Top row: GPS Network receiver locations for Japan GEONET (left) and PBO in the Western U.S. (right). Middle row: histogram of receiver-to-receiver baseline distances for GEONET and PBO. Bottom row: histogram of minimum distances to nearest station for GEONET and PBO.

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