Auroral Undulations During Magnetic Storms: TIMED/GUVI Observations

Details Auroral Undulations During Magnetic Storms: TIMED/GUVI Observations Auroral Undulations During Magnetic Storms: TIMED/GUVI Observations

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa13a..08z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA13A-08

Physics

2407 Auroral Ionosphere (2704), 2463 Plasma Convection, 2704 Auroral Phenomena (2407), 2788 Storms And Substorms

Scientific paper

Giant undulations on the equatorward edge of the diffuse aurora have been identified in TIMED/GUVI auroral images in the far ultraviolet wavelengths. Some new features have been observed: (1) The GUVI 121.6nm auroral images provide direct optical evidence that the undulations occur in the proton aurora, (2) Undulations are not limited to the dusk sector, they can occur in all local time sectors, (3) Both large ionospheric ion drift velocity (1000 m/s and above) and strong velocity shear (> 0.1 1/s) appear to be a necessary condition for the undulation to occur, (4) While almost all of the undulation events are observed during magnetic storms (Dst < -60 nT), one exceptional case shows undulation in the dayside associated with a positive Dst (30 nT), a large solar wind speed and a high solar wind dynamic pressure. The undulations can be explained by the K-H instability.

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