Geomagnetic Variations along Concurrent Latitudes due to Ionospheric Currents Inge Edvardsen – UiT & Baker Hughes Magnar Gullikstad Johnsen - UiT Unni.

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Presentation transcript:

Geomagnetic Variations along Concurrent Latitudes due to Ionospheric Currents Inge Edvardsen – UiT & Baker Hughes Magnar Gullikstad Johnsen - UiT Unni Pia Løvhaug - UiT

Magnetic Directional Surveying Auroral electrojet and Dipole declination/declination Substorm current wedge model Reproducing a real substorm measured at Tromsø Analyse the result from the model with respect to variations in declination along concurrent geomagnetic latitudes Outline

3 3

4 Magnetic Directional Surveying Horizontal Vertical Inclination Azimuth

5 Magnetic Directional Surveying

6 General formula for azimuth A – Azimuth A m – Magnetic azimuth δ – Declination b x, b y, b z – Magnetometer measurements τ – Toolface I – Inclination Magnetic Directional Surveying

7

Auroral electrojet and the effect from the current on the declination SPE

Substorm current wedge model First order physics model

Substorm to reproduce

Delta dipole declination / declination along 67deg geomagnetic latitude

Reproduced substorm Based on a geocentric dipole magnetic field model Current wedge 60 deg Magnetic midnight: I_max = 16.Oct 2014

Study of declination variation along concurrent geomagnetic latitudes Tromsø Yamal Alaska Labrador Sea

Declination variation - Tromsø Baker Hughes acceptance limit for declination variation Maximum deviation for declination variation at Tromsø 16.Oct 2014

Dip (inclination) variation - Tromsø Baker Hughes acceptance limit for dip variation Maximum deviation for declination dip at Tromsø 16.Oct 2014

Total Field variation - Tromsø Baker Hughes acceptance limit for total field variation Maximum deviation for total field at Tromsø 16.Oct 2014

Baker Hughes acceptance limit for declination variation Maximum deviation for declination variation at Tromsø Maximum deviation for declination variation at Yamal Declination variation - Yamal 16.Oct 2014

Baker Hughes acceptance limit for declination variation Maximum deviation for declination variation at Tromsø Maximum deviation for declination variation at Alaska Declination variation - Alaska 16.Oct 2014

Baker Hughes acceptance limit for declination variation Maximum deviation for declination variation at Tromsø Maximum deviation for declination variation at Labrador Sea Declination variation – Labrador Sea 16.Oct 2014

Study of declination variation along concurrent geomagnetic latitudes Tromsø Yamal Alaska Labrador Sea

At higher latitudes the substorm electrojet will often disturb the geomagnetic field, resulting in deviations larger than what is accepted by drilling companies. Azimuth is directly affected by any variation in declination. Along concurrent geomagnetic latitude, the declination variation caused by substorm electrojet will vary in both strength and sign. Summary

Geomagnetic Variations along Concurrent Latitudes due to Ionospheric Currents Inge Edvardsen – UiT & Baker Hughes Magnar Gullikstad Johnsen - UiT Unni Pia Løvhaug - UiT