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First light from a kilometer-baseline Scintillation Auroral GPS Array.

S Datta-Barua1, Y Su1, K Deshpande2

  • 1Mechanical, Materials, and Aerospace Engineering Department, Illinois Institute of Technology Chicago, Illinois, USA.

Geophysical Research Letters
|December 29, 2015
PubMed
Summary
This summary is machine-generated.

The Scintillation Auroral GPS Array (SAGA) provides the first subkilometer-scale measurements of GPS signal variations in the auroral zone. This array enables detailed studies of ionospheric irregularities and their connection to auroral phenomena.

Keywords:
Global Navigation Satellite SystemsGlobal Positioning Systemauroraionosphereirregularitiesscintillation

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Area of Science:

  • Space Physics
  • Geophysics
  • Ionospheric Physics

Background:

  • Global Positioning System (GPS) scintillation affects L-band signal propagation.
  • Understanding ionospheric irregularities requires high-resolution spatial and temporal measurements.

Purpose of the Study:

  • Introduce and analyze data from the Scintillation Auroral GPS Array (SAGA).
  • Measure spatial and temporal variations in GPS L-band signals at subkilometer scales in the auroral zone.

Main Methods:

  • Utilized a seven-receiver GPS scintillation array (SAGA) at Poker Flat Research Range, Alaska.
  • Collected 100-second scintillation indices and 100 Hz carrier phase and raw samples.
  • Compared SAGA data with all-sky images and incoherent scatter radar measurements.

Main Results:

  • SAGA is the largest existing array with baseline lengths matching the ionospheric diffractive Fresnel scale.
  • Observed simultaneous amplitude and phase scintillation using an initial five-receiver setup.
  • Demonstrated SAGA's capability for multi-instrument, subkilometer-scale studies.

Conclusions:

  • The seven-receiver SAGA is operational in Alaska for studying ionospheric irregularities.
  • SAGA enables phase and irregularity studies at unprecedented subkilometer scales.
  • Simultaneous observations of scintillation, auroral arcs, and electron precipitation were achieved.