26 October, 2010 (16:00 GMT), 5 Merrion Square, Dublin 2.
Speaker: Jan Dostal
Title: The magnetic field induced by ocean-circulation flow.
Abstract:
Observations of the ocean-induced magnetic field by the CHAMP magnetic space mission have the potential to be used as a constraint when examining ocean dynamics. This has initiated theoretical studies on the prediction of the ocean-induced magnetic field. These studies predict the poloidal magnetic field induced by the horizontal ocean-circulation flow by employing a single-layer approximation. Since the toroidal magnetic field cannot be modelled by this approximate model, we treat the ocean as a layer of finite thickness and model the toroidal magnetic field by a matrix-propagator technique with a source of electrical currents in the ocean layer. Although this primary toroidal magnetic field is not observable outside the oceans, it couples with a strong conductivity contrast between the oceans and continents and generates a secondary poloidal magnetic field. This field is observable by magnetic satellite missions and ground-based magnetic observatories situated close to the shoreline. Such constraints are expected to be improved upon by the launch in 2012 of the SWARM magnetic field observing satellites.
Leave a Comment
Last Updated: 22nd March 2016 by Anna
2010-10-26 – SEMINAR by Jan Dostal: The magnetic field induced by ocean-circulation flow
26 October, 2010 (16:00 GMT), 5 Merrion Square, Dublin 2.
Speaker: Jan Dostal
Title: The magnetic field induced by ocean-circulation flow.
Abstract:
Observations of the ocean-induced magnetic field by the CHAMP magnetic space mission have the potential to be used as a constraint when examining ocean dynamics. This has initiated theoretical studies on the prediction of the ocean-induced magnetic field. These studies predict the poloidal magnetic field induced by the horizontal ocean-circulation flow by employing a single-layer approximation. Since the toroidal magnetic field cannot be modelled by this approximate model, we treat the ocean as a layer of finite thickness and model the toroidal magnetic field by a matrix-propagator technique with a source of electrical currents in the ocean layer. Although this primary toroidal magnetic field is not observable outside the oceans, it couples with a strong conductivity contrast between the oceans and continents and generates a secondary poloidal magnetic field. This field is observable by magnetic satellite missions and ground-based magnetic observatories situated close to the shoreline. Such constraints are expected to be improved upon by the launch in 2012 of the SWARM magnetic field observing satellites.
Category: Geophysics Section News & Events
This #WorldBookDay we couldn't pick just one DIAS book to tell you about. And so we decided to highlight our wonderful DIAS Bookshop managed by our School of Celtic Studies. Learn more about the titles available here: shop.dias.ie/product-catego… #DIASdiscovers #WorldBookDay2021
Thanks @siliconrepublic for helping to share the findings siliconrepublic.com/innovation/iri…
DIAS scientists’ part of research team to record first ever detailed description of a volcanic eruption from Sierra Negra. Read more: dias.ie/2021/03/04/dia… #DIASdiscovers @dias_geophysics #volcano #Galapagos Image courtesy of @AndyFBell
Meet the Judges of our "Reach for the Stars" Astrophotography competition! Brenda Fitzsimons is photo editor of the @IrishTimes. To learn more about the competition and submit an entry see dias.ie/reachforthesta… #DIASdiscovers #astrophotography
Nice work 👏 twitter.com/dias_geophysic…
Following on from our post, highlighting inspiring #WomeninResearch and encouraging #MondayMotiviation to explore these subjects. @ChantalKobel presents Celticist, Nessa Ní Shéaghdha and her contributions to the discipline youtu.be/LGPLltjTBKw #DIASdiscovers
We have entered the last month to capture that amazing photo of the sky and win our Astrophotography competition. We are accepting photographs taken between 01 January 2020 and 31 March 2021. You can submit an entry up to Friday 02nd April 2021. More: dias.ie/reachforthesta…
Meet the Judges of our "Reach for the Stars" Astrophotography competition! @petertgallagher is Head of @DIASAstronomy & has spent the past two decades studying the Sun its impacts on the Earth. To learn more and submit an entry see dias.ie/reachforthesta… #DIASdiscovers
She has over 15 years’ experience working in PR and communications and has wide-ranging experience of providing strategic communications support to organisations. Learn more about the competition and submit an entry 👉dias.ie/reachforthesta… #DIASdiscovers #astrophotography