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<div class="elementToProof"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="elementToProof ContentPasted0">Dear Colleagues from the CEDAR community,</span></div>
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<div class="FluidPluginCopy ContentPasted0 ContentPasted1">The EGU General Assembly will take place as a hybrid conference (in Vienna, Austria and online) on 23–28 April 2023 (conference website:
<a href="https://www.egu23.eu/" id="LPNoLPOWALinkPreview">https://www.egu23.eu/</a>).</div>
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<div class="FluidPluginCopy ContentPasted0 elementToProof">We would like to draw your attention to Session ST3.6: Ionosphere – upper atmosphere physics with ground-based instrumentation (<a href="https://meetingorganizer.copernicus.org/EGU23/session/46384" title="https://meetingorganizer.copernicus.org/EGU23/session/46384" id="LPlnk221942">https://meetingorganizer.copernicus.org/EGU23/session/46384</a>).</div>
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<div class="FluidPluginCopy ContentPasted0 elementToProof">** Session description **</div>
<div class="FluidPluginCopy ContentPasted0 elementToProof">The Earth’s upper atmosphere and ionosphere are subject to significant variability associated with solar forcing. While in situ observations of the ionosphere-upper atmosphere are only possible with
spacecraft and sounding rockets, a wealth of information is obtained thanks to remote sensing techniques using ground-based instruments.</div>
<div class="FluidPluginCopy ContentPasted0">For instance, ground-based magnetometers, used in dense networks, routinely enable the derivation of ionospheric currents and geomagnetic indices. Optical instruments not only provide measurements of auroral and airglow
emissions, but are also used to observe upper atmospheric winds and temperatures, e.g. in the thermosphere and mesosphere. Such parameters can also be measured with radars, spanning a wide range of active (ionosondes, meteor radars, coherent and incoherent
scatter radars, VLF transmitters, Lidars) and passive (riometers, VLF receivers) systems.</div>
<div class="FluidPluginCopy ContentPasted0 elementToProof">Combining ground-based observations from various instruments enables the development of novel data analysis methodologies which in turn enhance our understanding of the underlying physics of space weather
and ionosphere-upper atmosphere processes. This includes the study of densities, temperatures and composition of the ionosphere–upper atmosphere, monitoring of its dynamics and chemistry, and measuring of fluxes from precipitating particles and current systems.</div>
<div class="FluidPluginCopy ContentPasted0">In this session, we invite contributions featuring the use of ground-based instruments in studies of the ionosphere–upper atmosphere system across all latitudes and of space weather and ionospheric–atmospheric physics
processes of various time and spatial scales.</div>
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<div class="FluidPluginCopy ContentPasted0 elementToProof">We are happy to announce that Dr. Axel Steuwer (EISCAT Scientific Association) has accepted to give an invited talk on the current status of EISCAT_3D and the new science it will enable in the near
future.</div>
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<div class="FluidPluginCopy ContentPasted0 elementToProof">Please note that the abstract submission deadline for EGU23 is on Tuesday, 10 January 2023 at 13:00 CEST (UTC+1). Guidelines on the abstract submission process can be found on the following page:
<a href="https://egu23.eu/programme/how_to_submit.html" title="https://egu23.eu/programme/how_to_submit.html" id="LPlnk579662">
https://egu23.eu/programme/how_to_submit.html</a>.</div>
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<div class="FluidPluginCopy ContentPasted0">Please do not hesitate to forward this announcement to your colleagues who make use of ground-based instrument data in their studies of upper atmospheric and ionospheric processes.</div>
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<div class="FluidPluginCopy ContentPasted0">We are looking forward to your contributions and to seeing you at EGU23!</div>
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<div class="FluidPluginCopy ContentPasted0">Best regards,</div>
<div class="FluidPluginCopy ContentPasted0">The EGU ST3.6 session convening team:</div>
Veronika Haberle, Maxime Grandin, Jia Jia, and Frederic Pitout<br>
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