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First observations of simultaneous interhemispheric conjugate high-latitude thermospheric winds

Kosch M. J., C. Anderson, H. -. Yiu, A. C. Kellerman, R. A. Makarevich, A. Aruliah, M. Conde, E. Griffin, T. Davies, I. McWhirter, P. L. Dyson, (2010), First observations of simultaneous interhemispheric conjugate high-latitude thermospheric winds, J. of Geophys. Res. [Space Physics], 115, doi:10.1029/2009JA015178

Abstract

We report the first observations of simultaneous high-latitude interhemispheric F region neutral wind fields by combining the 630 nm optical measurements from two scanning Doppler imagers (SDIs) and three Fabry-Perot interferometers (FPIs) for a period exceeding 5 h. From the Southern Hemisphere, a SDI at Mawson and a FPI at Davis, both in Antarctica, are geomagnetically mapped onto the Northern Hemisphere. These data are combined in the Northern Hemisphere with a SDI at Longyearbyen, Svalbard, and two FPIs near Kiruna in Sweden and Sodankyla in Finland. Geomagnetic conditions were moderate (Kp = 3−−3+) and steady although the interplanetary magnetic field Bz component did change polarity several times. There is good agreement between the conjugate 630 nm optical intensities and wind vectors where the two SDIs' fields of view overlap. All wind field vectors are overlaid onto the northern Super Dual Auroral Radar Network ion convection contours. Qualitatively, the agreement between neutral and ion flow is remarkably good throughout the study interval, even down to mesoscale spatial size.

Authors (sorted by name)

Anderson Aruliah Conde Davies Dyson Griffin Kellerman Kosch Makarevich McWhirter Yiu

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

Operation of the SuperDARN radars in the northern hemisphere is supported by the national funding agencies of Canada, France, Japan, the United Kingdom, and the United States. C. Down is thanked for his assistance in producing the SuperDARN convection plots. The SPDF/Modelweb, available at http://modelweb.gsfc.nasa.gov/models/cgm/cgm.html, was used to generate the conjugate mapping, geomagnetic coordinates, and magnetic local times. The OVATION tool, available at http://sd‐ www.jhuapl.edu/Aurora/ovation/guidelines.html and developed by Johns Hopkins University/Applied Physics Laboratory, was used to determine open‐closed field line boundary. IMF data are supported by the NASA/ACE program. This research was also supported by the Australian Research Council's Discovery Project DP0557369 and by the Australian Antarctic Science Program. M.J.K. was the recipient of a La Trobe University Institute of Advanced Study Distinguished Visiting Fellowship. The Longyearbyen SDI was funded by the STFC grant PP/C50165X/1.

Grants

PP/C50165X/1

Bibtex

@article{doi:10.1029/2009JA015178,
author = {Kosch, M. J. and Anderson, C. and Yiu, H.-C. I. and Kellerman, A. C. and Makarevich, R. A. and Aruliah, A. and Conde, M. and Griffin, E. and Davies, T. and McWhirter, I. and Dyson, P. L.},
title = {First observations of simultaneous interhemispheric conjugate high-latitude thermospheric winds},
journal = {Journal of Geophysical Research: Space Physics},
volume = {115},
year = {2010},
number = {A9},
pages = {},
keywords = {thermosphere, conjugate, wind},
doi = {10.1029/2009JA015178},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2009JA015178},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2009JA015178},
abstract = {We report the first observations of simultaneous high-latitude interhemispheric F region neutral wind fields by combining the 630 nm optical measurements from two scanning Doppler imagers (SDIs) and three Fabry-Perot interferometers (FPIs) for a period exceeding 5 h. From the Southern Hemisphere, a SDI at Mawson and a FPI at Davis, both in Antarctica, are geomagnetically mapped onto the Northern Hemisphere. These data are combined in the Northern Hemisphere with a SDI at Longyearbyen, Svalbard, and two FPIs near Kiruna in Sweden and Sodankyla in Finland. Geomagnetic conditions were moderate (Kp = 3−−3+) and steady although the interplanetary magnetic field Bz component did change polarity several times. There is good agreement between the conjugate 630 nm optical intensities and wind vectors where the two SDIs' fields of view overlap. All wind field vectors are overlaid onto the northern Super Dual Auroral Radar Network ion convection contours. Qualitatively, the agreement between neutral and ion flow is remarkably good throughout the study interval, even down to mesoscale spatial size.}
}