Observations of 3-m auroral irregularities during the ERRRIS campaigns
ABSTRACT In the late winter of 1988 and 1989, three NASA sounding rockets were flown through the auroral electrojet from ESRANGE (Sweden) as part of the E-region Rocket-Radar Instability Study (ERRIS). Many ground-based instruments supported these flights, including the EISCAT, STARE, and CUPRI radars, as well as all-sky cameras, riometers, and magnetometers. In this paper we summarize the observations of the Cornell University Portable Radar Interferometer (CUPRI), which detected coherent backscatter from 3-m irregularities in the auroral E-region. Twenty hours of power spectra and interferometry data are available, and, during the 1989 campaign, three weeks of nearly continuous Range-Time-Intensity (RTI) and first moment data were recorded.
SourceAvailable from: Clark Miller[Show abstract] [Hide abstract]
ABSTRACT: The Cornell University Portable Radar Inter- ferometer (CUPRI) provided nearly continuous monitor- ing of the mesosphere above Esrange, Sweden during the noctilucent cloud rocket and radar campaign of the sum- mer of 1991 (NLC-91). CUPRI probed the mesosphere above Esrange from 78 to 91 km altitude with 300-meter resolution and was sensitive to the enhanced Polar Meso- spheric Summer Echoes (PMSE) that occur in the same altitude range as NLC formations. Out of the total of 264 hours of CUP RI observation time, P MSE were present for 140 hours. Rocket Salvo A was flown on the night of August 9-10 into an NLC event that occurred simul- taneously with a thin and weakening PMSE layer. High- resolution Doppler spectrograms of this PMSE event re- vealed sawtooth-like discontinuities at ~ 83 km altitude, which we interpret to be a distorted partial reflection layer which was advected across the radar beam.10/1993; 20(20). DOI:10.1029/93GL01601
[Show abstract] [Hide abstract]
ABSTRACT: The Scandinavian Twin Auroral Radar Experiment (STARE) coherent radars are a powerful instrument for studying auroral zone plasma convection. In recent years the STARE radars have been collecting both double-pulse (DP) and multipulse (MP) data to measure the Doppler velocity of auroral echoes. We assess here DP-MP measurements for eight events covering 28 hours of operation. More often, there is a reasonable agreement between the DP and MP velocities. Exceptions are afternoon-evening observations for which the Finland radar DP velocity is nearly half the MP velocity obtained through fitting of the autocorrelation function of a received signal (ACF-FIT), although the DP and MP1 (first lag) velocities are in reasonable agreement. We demonstrate that for periods with strong differences between the DP and MP ACF-FIT velocities the spectra are strongly asymmetric, and the phase angle–lag number dependence is nonlinear with a slower rate of angle increase at small-number lags (Radio Science 06/2005; 40(RS3008). DOI:10.1029/2004RS003151 · 1.45 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: We provide a statistical summary of the Doppler features extracted from 21,000 independent E-region irregularity observations made during 2002 and 2003. These data were acquired using the Manastash Ridge Radar, which detects the scatter of commercial FM broadcasts near 100 MHz and observes at subauroral latitude. In particular, we present histograms of Doppler velocity and spectral width of the observations and discuss trends in these data with respect to local time and the geomagnetic Kp index. We find an asymmetric velocity distribution composed entirely of type 1 Doppler spectra; these waves are associated with the modified two-stream instability. Type 2 echoes are completely absent, suggesting a strong latitude and/or wave number dependence in the conditions for secondary wave instability. We compare our observations with HF and VHF coherent scatter results reported by others. Because the radar is completely passive, it is well suited for extended, unattended observations; in this 2-year period of nearly continuous operation, we find pronounced seasonal variation in our observations. The method of radar operation provides excellent data for statistical summary, as it is completely free of range and Doppler aliasing, while also providing fine time and frequency resolution.Journal of Geophysical Research Atmospheres 07/2004; 109(A7):7308-. DOI:10.1029/2004JA010396 · 3.44 Impact Factor