Detecting Narrow, Field-aligned Spatial Structures in the Auroral Ionosphere Using the Eiscat Svalbard Radar Dual Antennas as an Interferometer
نویسندگان
چکیده
In order to provide observations to help decide between competing theories of Anomalous Ion Spectra (AIS) observed at several Incoherent Scattering Radar (ISR) observatories, to explore the possibility of any connection between this phenomenon and visible auroral forms, and to see if enhanced scattering is due to localised scattering structures, we have used the two antennas of the EISCAT Svalbard Radar (ESR) as an interferometer, recording time series separately from each antenna. This offers an opportunity for high time-resolution observations, and also the possibility of detecting scattering structures localised along the baseline between the two antennas within the radar beam.
منابع مشابه
Field-aligned currents and ionospheric parameters deduced from EISCAT radar measurements in the post-midnight sector
Attempting to derive the field-aligned current (FAC) density using the EISCAT radar and to understand the role of the ionosphere on closing FACs, we conducted special radar experiments with the EISCAT radar on 9 October 1999. In order to derive the gradient of the ionospheric conductivity (grad6) and the divergence of the electric field (div E) nearly simultaneously, a special experiment employ...
متن کاملPhase calibration of the EISCAT Svalbard Radar interferometer using optical satellite signatures
The link between natural ion-line enhancements in radar spectra and auroral activity has been the subject of recent studies but conclusions have been limited by the spatial and temporal resolution previously available. The next challenge is to use shorter sub-second integration times in combination with interferometric programmes to resolve spatial structure within the main radar beam, and so r...
متن کاملAn imaging interferometry capability for the EISCAT Svalbard Radar
Interferometric imaging (aperture synthesis imaging) is a technique used by radio astronomers to achieve angular resolution that far surpasses what is possible with a single large aperture. A similar technique has been used for radar imaging studies of equatorial ionospheric phenomena at the Jicamarca Radio Observatory. We present plans for adding an interferometric imaging capability to the EI...
متن کاملEvidence for solar-production as a source of polar-cap plasma
The focus of the study is a region of enhanced ionospheric densities observed by the EISCAT Svalbard radar in the polar F-region near local magnetic noon under conditions of IMF Bz<0. Multi-instrument observations, using optical, spacecraft and radar instrumentation, together with radio tomographic imaging, have been used to identify the source of the enhancement and establish the background io...
متن کاملFirst simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
Cluster magnetic field data are studied during an outbound pass through the post-noon high-latitude magnetopause region on 14 February 2001. The onset of several minute perturbations in the magnetospheric field was observed in conjunction with a southward turn of the interplanetary magnetic field observed upstream by the ACE spacecraft and lagged to the subsolar magnetopause. These perturbation...
متن کامل