Abstract
AbstractWe report on simultaneous observation of artificial plasma density irregularities near the magnetic zenith (MZ) by incoherent scatter radar and GNSS satellite in the high latitude. During an EISCAT (European Incoherent Scatter Scientific Association) HF heating experiment, a GLONASS satellite signal intersected the disturbed ionospheric volume along the local magnetic field lines. The satellite signal amplitude and phase were simultaneously perturbed when the electron temperature increased in the F region through O‐mode HF waves. The field‐aligned irregularities (FAIs) and associated density perturbations are most significantly found in the MZ direction. The growth of FAI reached the saturation level in 30 s while large‐scale electron density perturbation on the order of 0.1 TECU developed in a few minutes. The observed density perturbations agree well with recent numerical studies of FAI generation due to the thermal self‐focusing process.
Highlights
Ionospheric modification by powerful HF radio waves has been found to be most effective when the transmitter beam is directed parallel to the Earth's magnetic field lines
We report on simultaneous observation of artificial plasma density irregularities near the magnetic zenith (MZ) by incoherent scatter radar and GNSS satellite in the high latitude
We report on simultaneous observation of HF-induced field-aligned electron temperature enhancement and density irregularities in the high latitude ionosphere through incoherent scatter radar and precise GLONASS measurements in MZ direction
Summary
Ionospheric modification by powerful HF radio waves has been found to be most effective when the transmitter beam is directed parallel to the Earth's magnetic field lines These so-called magnetic zenith (MZ) effects have been found in aspect angle dependence of plasma temperature enhancements and the excitation of airglow production Increased electron temperature or accelerated electrons can lead to an electron density enhancement at the upper/lower region along the field line In such cases, the thermal self-focusing instability induces the large-scale field-aligned irregularities (FAIs) with a transverse scale of ∼10 km. We report on simultaneous observation of HF-induced field-aligned electron temperature enhancement and density irregularities in the high latitude ionosphere through incoherent scatter radar and precise GLONASS measurements in MZ direction. The experiment was conducted by the European Incoherent Scatter (EISCAT) HF facility, UHF radar and a co-located GNSS receiver at Tromsø, Norway (69.58°N, 19.21°E)
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