Freiburg 2008 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Near Earth Space / CAWSES / EISCAT symposium

EP 1.8: Vortrag

Montag, 3. März 2008, 16:30–16:45, KGI-Aula

Precise measurements of E layer heights. A campaign for the COST296/IHY activities — David Altadill¹, Vadym Paznukhov², Giorgianna Francesci³, •Bodo reinisch², Ignano Blanco⁴, Anna Belehaki⁵, Josef Bosca⁶, John Bradford⁷, Paul Cannon⁸, Chris Hall⁹, Jens Mielich¹⁰, and Enrico Zucceretti³ — ¹Observatorio del Ebro, Spain — ²University of Massachusetts Lowell, USA — ³Istituto Nazionale di Geofisica e Vulcanologia, Italy — ⁴Instituto Nacional de Técnica Aerospacial, Spain, — ⁵National Observatory of Athens, Greece — ⁶Institute of Atmospheric Physics, Czech Republic — ⁷Radio Communications Research Unit, RAL, UK — ⁸Centre for RF Propagation and Atmospheric Research, QinetiQ, UK — ⁹Tromso Geophysical Observatory, Norway — ¹⁰Leibniz Institut für Atmosphärenphysik, Germany

A technique of enhanced-resolution group height measurements of ionospherically reflected radiowaves has been implemented in Digisonde sounders. Phase differences between signals with closely spaced frequencies determine the virtual heights of ionospheric layers with an accuracy of better than one kilometer. A campaign of precise measurements of E layer heights, h'E, by the European COST296 action supported the 3rd CAWSES campaign. Six European digisondes participated in the joint observations that lasted from June to August 2007. The paper presents a brief description of the measurement technique, and gives first results of the h'E variations observed during the campaign. The objective of these studies is the detection of coupling from below that can influence the E region plasma.