Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - High-latitude pump-induced optical emissions for frequencies close to the third electron gyro-harmonic
AU - Kosch, M. J.
AU - Rietveld, M. T.
AU - Kavanagh, A. J.
AU - Davis, C.
AU - Yeoman, T. K.
AU - Honary, F.
AU - Hagfors, T.
PY - 2002/12/10
Y1 - 2002/12/10
N2 - It has been long established that high-power O-mode HF pumping of the ionosphere can produce artificial optical emissions. 630 nm O(1D) photons are produced by pump-accelerated electrons colliding with the F-layer neutral oxygen. However, the mechanism for artificial electron acceleration remains unclear. Competing theories include Langmuir and upper-hybrid turbulence. Pump-induced HF coherent radar backscatter power is closely linked with upper-hybrid turbulence, both of which are known to reduce when pumping on an electron gyro-harmonic frequency. On 3 November 2000, the EISCAT HF facility was systematically stepped in frequency through the 3rd gyro-harmonic. A significant reduction in the artificial optical intensity coincides with that of CUTLASS radar backscatter power. This is conclusive proof that upper-hybrid turbulence is intimately linked to the mechanism for high-latitude pump-induced aurora, at least for 630 nm photons and the steady state.
AB - It has been long established that high-power O-mode HF pumping of the ionosphere can produce artificial optical emissions. 630 nm O(1D) photons are produced by pump-accelerated electrons colliding with the F-layer neutral oxygen. However, the mechanism for artificial electron acceleration remains unclear. Competing theories include Langmuir and upper-hybrid turbulence. Pump-induced HF coherent radar backscatter power is closely linked with upper-hybrid turbulence, both of which are known to reduce when pumping on an electron gyro-harmonic frequency. On 3 November 2000, the EISCAT HF facility was systematically stepped in frequency through the 3rd gyro-harmonic. A significant reduction in the artificial optical intensity coincides with that of CUTLASS radar backscatter power. This is conclusive proof that upper-hybrid turbulence is intimately linked to the mechanism for high-latitude pump-induced aurora, at least for 630 nm photons and the steady state.
KW - heating DCS-publications-id
KW - art-377
KW - DCS-publications-credits
KW - dasi
KW - iono-fa
KW - DCS-publications-personnel-id
KW - 7
KW - 9
KW - 5
KW - 56
U2 - 10.1029/2002GL015744
DO - 10.1029/2002GL015744
M3 - Journal article
VL - 29
SP - 2112
EP - 2115
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 23
ER -