<div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">---------- Mensaje reenviado ---------<br>De: <strong class="gmail_sendername" dir="auto">Paterson, Greig</strong> <span dir="auto"><<a href="mailto:Greig.Paterson@liverpool.ac.uk">Greig.Paterson@liverpool.ac.uk</a>></span><br>Fecha: El sáb, 25 jul. 2020 a la(s) 09:40<br>Asunto: [Gpmag-l] MagNetZ July 29<br>Para: GPMAG List <<a href="mailto:gpmag-l@mailman.ucsd.edu">gpmag-l@mailman.ucsd.edu</a>>, EMRP List <<a href="mailto:emrp@gfz-potsdam.de">emrp@gfz-potsdam.de</a>><br></div><br><br>
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<span lang="EN-US">Hi all,<u></u><u></u></span></p>
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<span lang="EN-US">Our next MagNetZ seminar is upcoming and we have a few changes in the works.<u></u><u></u></span></p>
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<span lang="EN-US">This time round we will be recording the seminars. These recordings will be made available online via a video streaming platform such as YouTube or similar (the exact platform has still to be decided as we are investigating the possibility
of making the seminars citable items). This is something that a number of people have requested since we started MagNetZ and will allow those in unable to attend to view the seminars at a later date; particularly for those in different time zones and as easing
restrictions changes our “normal” schedules.<u></u><u></u></span></p>
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<span lang="EN-US">Our currently scheduled speakers are happy to have their work their presentations disseminated like this and we encourage future speakers to create content that they are happy to share fully online to help promote our community.<u></u><u></u></span></p>
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<b>For attendees, please note that continued participation in a seminar after recording beginnings constitutes agreement for the recording to be publicly disseminated.</b><span lang="EN-US"> Some, but not all attendees may be visible in the recording. So, we
recommend muting your microphone and turning off your camera if you do not want to be visible.<u></u><u></u></span></p>
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<span lang="EN-US">Note that the networking catchup at the end of the seminars <b>
will not be recorded</b>. We welcome all comments and feedback on this.<u></u><u></u></span></p>
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<span lang="EN-US">The next seminar is </span>on Wednesday Ju<span lang="EN-US">ly</span><span lang="EN-US">
</span><span lang="EN-US">29</span> at 15:40 BST (<span lang="EN-US">GMT+1</span>)<span lang="EN-US"> and will be given by Kathy Whaler from the University of Edinburgh. She will be presenting “</span>The 2016 Pacific jerk and core-mantle boundary flows obtained
purely from Swarm secular variation gradient information<span lang="EN-US">”. The abstract is below.</span><u></u><u></u></p>
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<span lang="EN-US">As before, we will be emailing the meeting login details directly to participants. So if you are interested please email us (</span><a href="mailto:greig.paterson@liverpool.ac.uk" style="color:rgb(149,79,114)" target="_blank"><span lang="EN-US">greig.paterson@liverpool.ac.uk</span></a><span lang="EN-US">)
and we’ll add you to the list.<u></u><u></u></span></p>
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<span lang="EN-US">If you are already on the list from a previous seminar, there is no need to get in touch.<u></u><u></u></span></p>
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<span lang="EN-US">And thanks to everyone who joined us last week and for support the seminar series. We’re looking forward to seeing you all next week.<u></u><u></u></span></p>
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All the best<u></u><u></u></p>
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<u></u> <u></u></p>
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Greig Paterson, University of Liverpool (<a href="mailto:greig.paterson@liverpool.ac.uk" target="_blank">greig.paterson@liverpool.ac.uk</a>)<u></u><u></u></p>
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Anita Di Chiara, INGV-Rome and SIO University of California, San Diego<u></u><u></u></p>
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<span lang="EN-US">Abstract:<u></u><u></u></span></p>
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The 2016 Pacific jerk and core-mantle boundary flows obtained purely from Swarm secular variation gradient information<u></u><u></u></p>
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Kathy Whaler<sup>1</sup>, Magnus Hammer<sup>2</sup>, Chris Finlay<sup>2</sup> and Nils Olsen<sup>2<u></u><u></u></sup></p>
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<sup>1</sup>School of GeoSciences, University of Edinburgh, UK; <sup>2</sup>DTU Space, Denmark<u></u><u></u></p>
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The Swarm constellation provides information on both along- and across-track magnetic field gradients. Spatial changes of the magnetic vector field elements are described by a magnetic field gradient tensor, whose elements and their uncertainties can be estimated
using the Virtual Observatory (VO) concept, whereby data within a cylinder centred on the VO with axis perpendicular to the Earth’s surface are reduced to a central point at satellite altitude. Recent experiments have shown that analysing data collected over
a 4 month window provides the best compromise between reducing bias from the way the satellite orbits sample each VO cylinder and preserving information on temporal changes of the field, and that the data provide spatial information sufficient to resolve 300
non-overlapping VOs. We invert annual first differences of the 5 independent gradient tensor elements (providing estimates of secular variation, SV, gradients) at these 300 VOs over the Swarm era for advective velocity at the core-mantle boundary, forcing
the flow to have minimal acceleration while providing an adequate fit to the data. We obtain flows similar to those from previous SV inversions but purely from the gradient information. The resolution of the SV gradients is higher than that of the SV itself,
resulting in a ~30% increase in the number of effective flow parameters; this is thought to be because the gradients are less affected by long period external signals that are difficult to remove from the data, resulting in an improved signal to noise ratio.
Although very little temporal change in the flow is required to reproduce even rapid changes in the magnetic field, we are able to isolate some robust flow changes, in particular regarding changes in the azimuthal flow acceleration, associated with the geomagnetic
impulse in the Pacific region in around 2016.<u></u><u></u></p>
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