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Sub-5km baseline tomography for fine-scale auroral measurements
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-5596-346X
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2014 (English)In: 2014 United States National Committee of URSI National Radio Science Meeting, USNC-URSI NRSM 2014, IEEE , 2014, 6928074- p.Conference paper (Refereed)
Abstract [en]

Auroral morphologies are a direct result of the specific energy levels driving the optical emissions as well as the spreading of wave energy. The emphasis of the present work is on identifying apparent auroral feature motion in both the B∥ and B⊥ dimensions in order to uncover the physical model responsible for wave spreading under the given electron beam excitation. The auroral B∥ dimension is known to experience a change in shape and peak optical emission for given electron beam energies, and forward models have been previously established for these phenomena. The transverse proper motion of auroral features is related to spreading of energy in the B⊥ direction. Several theories have been advanced to explain the auroral transverse proper motion, but previous observational efforts have been limited to temporal scales on the order of a second. Our new observational facility is capable of simultaneously resolving features to the decameter scale spatially and millisecond scale temporally{a capability not available until now thanks to recent advances in Electron-Multiplying Charge Coupled Device (EMCCD) technology that are triggerable with sub-millisecond accuracy from GPS-disciplined trigger sources. We can thereby combine multiple simultaneous 2D optical observations with arbitrarily physical separation to take tightly time-synchronized observations of extremely faint optical phenomena for tomographic inversion.

Place, publisher, year, edition, pages
IEEE , 2014. 6928074- p.
Keyword [en]
Charge coupled devices, Electron beams, Light emission, Wave energy conversion, Electron beam energy, Electron beam excitation, Electron multiplying charge coupled devices, Optical emissions, Optical observations, Physical separation, Resolving features, Tomographic inversion
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Other Physics Topics
URN: urn:nbn:se:kth:diva-157949DOI: 10.1109/USNC-URSI-NRSM.2014.6928074ScopusID: 2-s2.0-84911478605ISBN: 978-147993120-0OAI: diva2:773679
2014 United States National Committee of URSI National Radio Science Meeting, USNC-URSI NRSM 2014, 8 January 2014 through 11 January 2014, Boulder, United States

QC 20141219

Available from: 2014-12-19 Created: 2014-12-18 Last updated: 2014-12-19Bibliographically approved

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Dahlgren, Hanna
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