ESTIMATING THE FIELD-PARALLEL SCALE LENGTH OF ARTIFICIAL F-REGION STRIATIONS BY MEANS OF HF RADAR BACKSCATTER

We used the HF coherent scatter radar at Hankasalmi, Finland to observe striations generated by the EISCAT HF facility near Tromsø, Norway. By sweeping the radar frequency we can estimate the field-parallel scale length of the irregularities, since ionospheric refraction brings rays at higher freque...

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Bibliographic Details
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Norway
Tromsø
EISCAT
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.572.4749
http://www.ursi.org/Proceedings/ProcGA05/pdf/HG2.9(0635).pdf
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Summary:We used the HF coherent scatter radar at Hankasalmi, Finland to observe striations generated by the EISCAT HF facility near Tromsø, Norway. By sweeping the radar frequency we can estimate the field-parallel scale length of the irregularities, since ionospheric refraction brings rays at higher frequencies to orthogonality with the geomagnetic field (necessary to receive backscatter) at higher altitudes. In daytime conditions, the scale length was ~20 km. This approach assumes highly aspect-sensitive irregularities. Recent observations of radar backscatter from striations in an ionosphere perturbed by travelling disturbances may indicate evidence of lower aspect-sensitivity.

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