Artificial E-region field-aligned plasma irregularities generated at pump frequencies near the second electron gyroharmonic
نویسندگان
چکیده
منابع مشابه
MHz radar observations of artificial E region field - aligned plasma irregularities
Artificial E region field aligned irregularities (FAIs) have been observed during heating experiments at the HAARP facility using a new 30 MHz coherent scatter radar imager deployed near Homer, Alaska. Irregularities were observed during brief experiments on three quiet days in July and August, 2007, when the daytime E region critical frequency was close to 3 MHz. Irregularities were consistent...
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High-power high-frequency radio waves beamed into the ionosphere cause plasma turbulence, which can accelerate electrons. These electrons collide with the F-layer neutral oxygen causing artificial optical emissions identical to natural aurora. Pumping at electron gyro-harmonic frequencies has special significance as many phenomena change their character. In particular, artificial optical emissi...
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We present radar backscatter power measurements using the CUTLASS HF radar at Hankasalmi, Finland from F-region field-aligned irregularities induced by HF radio pumping with the EISCAT Heating facility. A novel radar operating mode is used in which the radar frequency is rapidly swept through a number of bands, making use of the varying ionospheric refraction to probe different heights within t...
متن کاملSpatiotemporal evolution of radio wave pump-induced ionospheric phenomena near the fourth electron gyroharmonic
[1] On 12 November 2001, the European Incoherent Scatter (EISCAT) high-frequency (HF) radio wave transmitter facility, operating in O-mode at 5.423 MHz with 550 MW effective radiated power, produced artificial optical rings which appeared immediately at transmitter turn-on and collapsed into blobs after 60 s while descending in altitude. A similar descent in altitude was observed in the EISCAT ...
متن کاملPredicted and observed characteristics of small-scale field-aligned irregularities generated in the F-region by low power HF heating
Simultaneous HF scattering from the different regions of the heated volume is used to investigate characteristics of the small-scale field-aligned irregularities in the Fregion. Time of growth, decay rate and saturation level for different pump powers are deduced from the observations and are compared with their behaviour predicted by the thermal parametric instability model. As a result, the e...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2009
ISSN: 1432-0576
DOI: 10.5194/angeo-27-2711-2009