“Simultaneous measurements of convection changes in the high-latitude day- and night- side ionosphere with the Halley and TIGER HF backscatter radars -

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SuperDARN is a network of HF radars (8-20 MHz) used to study the convection in the Earth's ionosphere at altitudes between 90 and 400 km and at magnetic.

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Presentation transcript:

“Simultaneous measurements of convection changes in the high-latitude day- and nightside ionosphere with the Halley and TIGER HF backscatter radars - early results” M. L. Parkinson 1, M. Pinnock 2, P. L. Dyson 1, J. C. Devlin 3, and P. R. Smith 3 (1) Department of Physics, La Trobe University, Melbourne, Victoria 3083, Australia (2) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (3) Department of Electronic Engineering, La Trobe University, Melbourne, Victoria 3083, Australia Acknowledgements: Anthony Breed, Mark Gentile, Jin Li Huang, Bruce Lobb, Steven Merrifield, Ray Morris, Norman F. Ness, Steven Wang, Jim Whittington.

Some Recent Work: [1] Siscoe, G. L., and T. S. Huang, J. Geophys. Res., 90, 543–547, [2] Cowley, S. W. H., and M. Lockwood, Ann. Geophysicae, 10, 103–, [3] D. Neudegg, et al., ANARE Research Notes, 95, 152–167, [4] Ridley, A. J., L. Gang, C. R. Clauer, and V. O. Papitashvili, J. Geophys. Res., 103, 4,023  4,039, [5] Ruohoniemi, J. M., and R. A. Greenwald, Geophys. Res. Lett., 25, 2,913  2,916, [6] Shepherd, S. G., R. A. Greenwald, and J. M. Rhuohoniemi, Geophys. Res. Lett., In Press, M. C. Kelley, 1989

The Fundamental Question(s): Do convection changes initiated on the dayside appear on the nightside after the magnetospheric field lines have been swept over the polar cap (~100 km s -1 at the magnetopause; ~5-10 km s -1 at their ionospheric footprint), or via a fast- mode Alfven wave propagating through the ionosphere at ~450 km s -1 ? That is, do convection changes manifest on the nightside after 10 to 30 mins, or “simultaneously” (  2 mins)? Do both mechanisms play a role in communicating large- scale convection changes, and to what extent and under what conditions? Do convection changes occur on the dayside after changes occur on the nightside (i.e., when dayside merging relaxes, and reconnection in the tail dominates)?

Halley, Beam #8 TIGER, Beam #4 CGM Pole RCP: “Z_Tiger_99” (Written by “Kevin,” Halley Base) Halley Beam Sequence: 0, 8, 1, 8, 2, 8, 3, 8, 4, … TIGER Beam Sequence: 15, 4, 14, 4, 13, 4, 12, … Halley Beam #8: MLT  UT – 02 h 46 m TIGER Beam #4: MLT  UT + 10 h 25 m Bundoora DPS-4: MLT  UT + 10 h 18 m Bundoora DPS-4 Magnetic Noon Magnetic Midnight

Ideally, what do we hope to see? Mike Pinnock, BAS

The Geomagnetic Storm of Feb. 12, 2000

Disturbance Dynamo Fields?

Prompt penetration fields?

Closing Remarks Identifying the different arrival times of convection changes observed by two SuperDARN radars is a very subjective process. One has to be very careful here... So far, the evidence suggests that nightside convection changes occur about 10 minutes after changes on the dayside. However, this does not preclude the occurrence of “instantaneous” changes within the polar cap... There is evidence for prompt-penetration electric fields and disturbance dynamo fields in concurrent Digisonde observations of Doppler velocity. The time delays for these events, and their relationship to SAIDs, is being investigated...