An Overview and Update on the Irish Repeat Station Survey Programme

Paper type: 
Oral presentation

An Overview and Update on the

Irish Repeat Station Survey Programme

 

Keith Lambkin, Michael Crean

 

Met Éireann, Valentia Observatory, Caherciveen, Co. Kerry, Ireland

 

keith.lambkin@met.ie

 

The national magnetic programme in Ireland is run by Met Éireann, the Irish Meteorological Service. The current Irish repeat station survey programme is managed from Valentia Observatory and is based on a station network established in 1959. Over the last five decades revisiting these repeat stations has been irregular including a gap of 20 years. In 2001 a plan was implemented to reduce the frequency of subsequent surveys. The survey in 2005 saw a four year period between visits, the 2008 survey saw a period of three years and the recent 2010 survey has reduced the measurement period to our desired frequency of two years.

 

Recently all Irish repeat stations have been scrutinised for their quality. Some stations have been closed as a result of advancing towns or new motorways, while some new stations have been established. Our 2010 survey represents our finalised updated network which we hope to visit biennially for the foreseeable future.

 

The network consists of 19 repeat stations spaced approximately 80km apart. Measurements are made using a DMI Di-Fluxgate Magnetometer (Model G) attached to a Zeiss 010B theodolite along with a Gem GSM-19 Overhauser magnetometer. Similar infrastructure is permanently installed at Valentia Observatory along with a DMI fluxgate magnetometer (model FGE-G suspended version). As the only geomagnetic observatory in Ireland, Valentia is used for the data reduction process.

 

It is planned to use this biennially repeat station data as routine input to a new Irish magnetic model which is currently in development.

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