Perturbing the high-latitude upper ionosphere (F region) with powerful HF radio waves: A 25-year collaboration with EISCAT

Blagoveshchenskaya, N. F.

doi:10.23919/ursirsb.2020.9318436

Cited by 18 publications

(19 citation statements)

References 45 publications

(92 reference statements)

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“…The X‐mode FAIs, similar to the other X‐mode phenomena, were only excited by HF pump waves radiated toward the magnetic zenith (Blagoveshchenskaya et al., 2015). They were excited at pump frequencies below and above the critical frequency of the F 2 layer ( f H ≤ f o F 2 and f H > f o F 2) (Blagoveshchenskaya, 2020; Blagoveshchenskaya et al., 2011, 2015, 2019). The generation of the X‐mode FAIs occurs in two steps.…”

Section: Introductionmentioning

confidence: 99%

“…They are generated at the upper hybrid resonance height, which is several kilometers below the reflection altitude of the HF pump wave, through the thermal parametric (resonance) instability (Grach & Trakhtengerts, 1975;Vas'kov & Gurevich, 1976). Investigations of FAIs induced by extraordinary (X-mode) HF pump waves in the high latitude ionosphere F-region have been carried out during a large number of EISCAT HF pumping experiments (Blagoveshchenskaya, 2020;Blagoveshchenskaya et al, 2011Blagoveshchenskaya et al, , 2015Blagoveshchenskaya et al, , 2017Blagoveshchenskaya et al, , 2019Blagoveshchenskaya et al, , 2020. The features and behavior of the X-mode FAIs differ radically from O-mode effects.…”

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confidence: 99%

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Ion Gyro‐Harmonic Structures in Stimulated Emission Excited by X‐Mode High Power HF Radio Waves at EISCAT

et al. 2021

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The distinctive features of the ion gyro‐harmonic discrete structures in the narrowband stimulated electromagnetic emission (NSEE) spectra (within ±1 kHz of the heater frequency), excited by an extraordinary (X‐mode) polarized high frequency (HF) pump wave in the F‐region of the high latitude ionosphere, are reported. Results were obtained from three sets of experiments at the EISCAT (European incoherent Scatter) HF Heating facility at pump frequencies of 5.423, 6.77 and 7.953 MHz, which are below the fourth, fifth, and sixth electron gyro‐harmonics. High power HF radio waves were radiated in the magnetic field‐aligned direction with an effective radiated power of 238–740 MW. Discrete spectral features, ordered by the ion gyro frequency (for O+ ions), were recorded at a large distance (1,200 km) away from the Heating facility. Up to 10 downshifted discrete ion gyro‐harmonic structures paired with the upshifted spectral components (Stokes and anti‐Stokes modes) in the NSEE spectra have been excited in the course of these experiments. It was found that preconditioning effects have a significant impact on the temporal evolution of the discrete spectral structures. The ion gyro‐harmonic structures coexisted with field‐aligned artificial irregularities (FAIs). Comparing the NSEE and EISCAT incoherent scatter radar observational results, it was concluded that the electron accelerations along and across the geomagnetic field coexist during X‐mode heating. The magnetized stimulated Brillouin scatter and stimulated ion Bernstein scatter are discussed as relevant processes for the observed multiple down‐ and upshifted ion gyro‐harmonic structures in the NSEE spectra.

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Section: Introductionmentioning

confidence: 99%

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Ion Gyro‐Harmonic Structures in Stimulated Emission Excited by X‐Mode High Power HF Radio Waves at EISCAT

et al. 2021

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“…A large international community of scientists have been able to use the Tromsø HF facility, especially in the last decade, as non-EISCAT Associates could either buy time or apply for a limited number of free hours on either the IS radar, heater, or both via a peer-review programme. An excellent exam- ple of fruitful scientific results from heating experiments by a non-EISCAT Associate is a 25-year collaboration with a group from the Russian Arctic and Antarctic Research Institute (Blagoveshchenskaya et al, 2020). Other long-term users were researchers from the Polar Geophysical Institute, in Murmansk, Russia, and from the Institute of Radio Astronomy in Ukraine.…”

Section: Present Status and Futurementioning

confidence: 99%

History of the Tromsø ionosphere heating facility

Rietveld

Stubbe

2022

Hist. Geo Space. Sci.

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Abstract. We present the historical background of the construction of a major ionospheric heating facility, “Heating”, near Tromsø, Norway, in the 1970s by the Max Planck Institute for Aeronomy; we also detail the facility's subsequent operational history to the present. Heating was built next to the European Incoherent Scatter Scientific Association (EISCAT) incoherent scatter (IS) radar facility and in a region with a multitude of diagnostic instruments used to study the auroral region. The facility was transferred to EISCAT in January 1993 and continues to provide new discoveries in plasma physics and ionospheric and atmospheric science to this day. It is expected that Heating will continue operating along with the new generation of IS radar, called EISCAT_3D, when it is commissioned in the near future.

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“…A large international community of users have been able to use the Tromsø HF facility, especially in the last decade when non-EISCAT Associates could either buy time or apply for a limited number of free hours on either or ISR or heater or both, through a peer-review system. An excellent example of fruitful scientific results heating experiments by a non-EISCAT associate is a 25-year collaboration with a group from the Russian Arctic and Antarctic Research Institute (Blagoveshchenskaya et al, 2020). Other long-term users were researchers from the Polar Geophysical Institute, in Murmansk, Russia, and from the Institute of Radio Astronomy in Ukraine.…”

Section: Present Status and Futurementioning

confidence: 99%

History of the Tromsø Ionosphere Heating facility

Rietveld

Stubbe

2021

Preprint

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Abstract. We present the historical background to the construction of a major ionospheric heating facility near Tromsø, Norway in the 1970s by the Max Planck Institute for Aeronomy and the subsequent operational history to the present. It was built next to the EISCAT incoherent scatter radar facility and in a region with a multitude of diagnostic instruments used to study the auroral region. The facility was transferred to the EISCAT Scientific Association in January 1993 and continues to provide new discoveries in plasma physics and ionospheric and atmospheric science to this day. It is expected that ‘Heating’ will continue operating together with the new generation of incoherent scatter radar, called EISCAT_3D, when it is commissioned in the near future.

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Perturbing the high-latitude upper ionosphere (F region) with powerful HF radio waves: A 25-year collaboration with EISCAT

Cited by 18 publications

References 45 publications

Ion Gyro‐Harmonic Structures in Stimulated Emission Excited by X‐Mode High Power HF Radio Waves at EISCAT

Ion Gyro‐Harmonic Structures in Stimulated Emission Excited by X‐Mode High Power HF Radio Waves at EISCAT

History of the Tromsø ionosphere heating facility

History of the Tromsø Ionosphere Heating facility

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