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Aspect angle sensitivity of pump-induced optical emissions at EISCAT

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Aspect angle sensitivity of pump-induced optical emissions at EISCAT. / Kosch, Michael; Bryers, Carl; Rietveld, M. T. et al.
In: Earth, Planets and Space, Vol. 66, No. 1, 159, 04.12.2014.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Kosch, M, Bryers, C, Rietveld, MT, Yeoman, TK & Ogawa, Y 2014, 'Aspect angle sensitivity of pump-induced optical emissions at EISCAT', Earth, Planets and Space, vol. 66, no. 1, 159. https://doi.org/10.1186/s40623-014-0159-x

APA

Kosch, M., Bryers, C., Rietveld, M. T., Yeoman, T. K., & Ogawa, Y. (2014). Aspect angle sensitivity of pump-induced optical emissions at EISCAT. Earth, Planets and Space, 66(1), Article 159. https://doi.org/10.1186/s40623-014-0159-x

Vancouver

Kosch M, Bryers C, Rietveld MT, Yeoman TK, Ogawa Y. Aspect angle sensitivity of pump-induced optical emissions at EISCAT. Earth, Planets and Space. 2014 Dec 4;66(1):159. doi: 10.1186/s40623-014-0159-x

Author

Kosch, Michael ; Bryers, Carl ; Rietveld, M. T. et al. / Aspect angle sensitivity of pump-induced optical emissions at EISCAT. In: Earth, Planets and Space. 2014 ; Vol. 66, No. 1.

Bibtex

@article{3936873827da4846aba4030b0eba61a8,
title = "Aspect angle sensitivity of pump-induced optical emissions at EISCAT",
abstract = "We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing direction is in the magnetic zenith (approximately 12° S of local zenith). For pump beam directions further north from field aligned, the optical emission intensity decreases for the same pump power. In addition, the primary photon-emitting region becomes displaced towards the magnetic zenith relative to the pump beam and for larger aspect angles, the brightest emissions were found to be outside the −3-dB pump beam width. The Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) coherent scatter high-frequency (HF) radar detected a quasi-constant level of backscatter power from the pumped ionosphere, indicating that saturated striations were formed for all pump beam directions. This indicates that the presence of upper-hybrid resonance is not sufficient to explain the angular sensitivity of the optical emissions.",
keywords = "Wave plasma interaction, Ionosphere, Aspect angle",
author = "Michael Kosch and Carl Bryers and Rietveld, {M. T.} and Yeoman, {T. K.} and Yasunobu Ogawa",
year = "2014",
month = dec,
day = "4",
doi = "10.1186/s40623-014-0159-x",
language = "English",
volume = "66",
journal = "Earth, Planets and Space",
issn = "1343-8832",
publisher = "Springer Heidelberg",
number = "1",

}

RIS

TY - JOUR

T1 - Aspect angle sensitivity of pump-induced optical emissions at EISCAT

AU - Kosch, Michael

AU - Bryers, Carl

AU - Rietveld, M. T.

AU - Yeoman, T. K.

AU - Ogawa, Yasunobu

PY - 2014/12/4

Y1 - 2014/12/4

N2 - We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing direction is in the magnetic zenith (approximately 12° S of local zenith). For pump beam directions further north from field aligned, the optical emission intensity decreases for the same pump power. In addition, the primary photon-emitting region becomes displaced towards the magnetic zenith relative to the pump beam and for larger aspect angles, the brightest emissions were found to be outside the −3-dB pump beam width. The Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) coherent scatter high-frequency (HF) radar detected a quasi-constant level of backscatter power from the pumped ionosphere, indicating that saturated striations were formed for all pump beam directions. This indicates that the presence of upper-hybrid resonance is not sufficient to explain the angular sensitivity of the optical emissions.

AB - We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing direction is in the magnetic zenith (approximately 12° S of local zenith). For pump beam directions further north from field aligned, the optical emission intensity decreases for the same pump power. In addition, the primary photon-emitting region becomes displaced towards the magnetic zenith relative to the pump beam and for larger aspect angles, the brightest emissions were found to be outside the −3-dB pump beam width. The Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) coherent scatter high-frequency (HF) radar detected a quasi-constant level of backscatter power from the pumped ionosphere, indicating that saturated striations were formed for all pump beam directions. This indicates that the presence of upper-hybrid resonance is not sufficient to explain the angular sensitivity of the optical emissions.

KW - Wave plasma interaction

KW - Ionosphere

KW - Aspect angle

U2 - 10.1186/s40623-014-0159-x

DO - 10.1186/s40623-014-0159-x

M3 - Journal article

VL - 66

JO - Earth, Planets and Space

JF - Earth, Planets and Space

SN - 1343-8832

IS - 1

M1 - 159

ER -