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A New Automatic Method for Estimating the Peak Auroral Emission Height from All-sky Camera Images : Volume 2, Issue 2 (25/10/2012)

By Whiter, D. K.

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Book Id: WPLBN0004009126
Format Type: PDF Article :
File Size: Pages 32
Reproduction Date: 2015

Title: A New Automatic Method for Estimating the Peak Auroral Emission Height from All-sky Camera Images : Volume 2, Issue 2 (25/10/2012)  
Author: Whiter, D. K.
Volume: Vol. 2, Issue 2
Language: English
Subject: Science, Geoscientific, Instrumentation
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Partamies, N., Sangalli, L., Gustavsson, B., & Whiter, D. K. (2012). A New Automatic Method for Estimating the Peak Auroral Emission Height from All-sky Camera Images : Volume 2, Issue 2 (25/10/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Finnish Meteorological Institute, Helsinki, Finland. This paper presents a new fully automatic method for quickly finding the average peak emission height of an auroral structure from a pair of all-sky camera images with overlapping fields of view. The peak emission height of the aurora must be estimated in order to calculate several other important parameters, such as horizontal spatial scales, optical flow velocities, and ionospheric electric fields. In most cases the height is not measured, but a value is assumed, often about 110 km. It is unclear how accurate this assumption is. A future statistical study of the auroral height in which the method presented here will be applied to many years of observations will lead to more accurate assumptions of the height with quantitative error estimates, and therefore more accurate estimates of parameters derived using these assumed auroral heights. In the present work the performance of the new method is compared to another recent automatic method. It is found that the new method is more suitable for a statistical study, although it would be advantageous to apply both methods to each pair of images. On average the new method produces the correct result, unlike the other recent method, but the new method is less consistent.

Summary
A new automatic method for estimating the peak auroral emission height from all-sky camera images

Excerpt
McEwen, D. J. and Montalbetti, R.: Parallactic Measurements on Aurorae over {C}hurchill, {C}anada, Can. J. Phys., 36, 1593–1600, doi:10.1139/p58-161, 1958.; Obuchi, Y., Sakanoi, T., Asamura, K., Yamazaki, A., Kasaba, Y., Hirahara, M., Ebihara, Y., and Okano, S.: Fine-scale dynamics of black auroras obtained from simultaneous imaging and particle observations with the {R}eimei satellite, J. Geophys. Res., 116, A00K07, doi:10.1029/2010JA016321, 2011.; Partamies, N., Syrj{ä}suo, M., Donovan, E., Connors, M., Charrois, D., Knudsen, D., and Kryzanowsky, Z.: Observations of the auroral width spectrum at kilometre-scale size, Ann. Geophys., 28, 711–718, doi:10.5194/angeo-28-711-2010, 2010.; Rees, M. H.: A Method for Determining the Height and Geographical Position of an Auroral Arc from One Observing Station, J. Geophys. Res., 68, 175–183, 1963{a}.; Rees, M. H.: Auroral Ionization and Excitation by Incident Energetic Electrons, Planet. Space Sci., 11, 1209–1218, 1963{b}.; Roach, F. E., Moore, J. G., Bruner, Jr., E. C., Cronin, H., and Silverman, S. M.: The Height of Maximum Luminosity in an Auroral Arc, J. Geophys. Res., 65, 3575–3580, 1960.; Romick, G. J. and Belon, A. E.: The Spatial Variation of Auroral Luminosity–{I}. The Behavior of Synthetic Model Auroras, Planet. Space Sci., 15, 475–493, 1967{a}.; Romick, G. J. and Belon, A. E.: The Spatial Variation of Auroral Luminosity–{II}. Determination of Volume Emission Rate Profiles, Planet. Space Sci., 15, 1695–1716, 1967{b}.; Sandholt, P.-E., Egeland, A., Henriksen, K., Smith, R., and Sweeney, P.: Optical Measurements of a Nightside Poleward Expanding Aurora, J. Atmos. Terr. Phys., 44, 71–79, 1982.; Sangalli, L., Gustavsson, B., Partamies, N., and Kauristie, K.: Estimating the Peak Auroral Emission Altitude from All-sky Images, {Ó}ptica Pura y Aplicada, 44, 593–598, 2011.; Semeter, J., Zettergren, M., Diaz, M., and Mende, S.: Wave dispersion and the discrete aurora: New constraints derived from high-speed imagery, J. Geophys. Res., 113, A12208, doi:10.1029/2008JA013122, 2008.; Sigernes, F., Moen, J., Lorentzen, D. A., Deehr, C. S., Smith, R., Øieroset, M., Lybekk, B., and Holtet, J.: {SCIFER}-Height measurements of the midmorning aurora, Geophys. Res. Lett., 23, 1889–1892, 1996.; St{ö}rmer, C.: The Polar Aurora, {T}he {C}larendon {P}ress, Oxford, 1955.; Syrj{ä}suo, M. T. and Donovan, E. F.: Using Relevance Feedback in Retrieving Auroral Images, in: Proceedings of the Fourth IASTED International Conference on Computational Intelligence, Calgary, Canada, 4–6 July, edited by: Hamza, M. H., 420–425, {IASTED/ACTA P}ress, 2005.; Harang, L.: The Aurorae, C}hapman {& {H}all, London, 1951.; Ashrafi, M., Kosch, M. J., and Kaila, K.: Height triangulation of artificial optical emissions in the F-layer, in: Proceedings of the 31st Annual European Meeting on Atmospheric Studies by Optical Methods, and 1st International Riometer Workshop, 22–28 August 2004, Ambleside, United Kingdom, 8–16, available at: http://spears.lancs.ac.uk/publications/31am_proceedings.pdf, 2005.; Aso, T., Ejiri, M., Urashima, A., Miyaoka, H., Steen, Å., Br{ä}ndstr{ö}m, U., and Gustavsson, B.: First results of auroral tomography from {ALIS-J}apan multi-station observations in {M}arch, 1995, Earth Planets Space, 50, 81–86, 1998.; Boyd, J. S., Belon, A. E., and Romick, G. J.: Latitude and Time Variations in Precipitated Electron Energy Inferred from Measurements of Auroral Heights, J. Geophys. Res., 76, 7

 

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