Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa22a..01l&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA22A-01
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7900 Space Weather, 2400 Ionosphere (6929), 2700 Magnetospheric Physics (6939), 3300 Atmospheric Processes
Scientific paper
The relationship between phenomena of solar origin and the climate of Earth depends, to some degree, on the transport of electromagnetic energy to the upper atmosphere. The processes that enable this energy transfer are complex (and often interrelated) and typically include storms and substorms and, more specifically, the transport of energy via waves and particle precipitation. Not surprisingly, the effectiveness of the coupling often changes with season as well as the variability of parameters within the solar wind, an effect noted especially with regard to substorms. In this talk, recent work regarding interhemispheric differences in substorm onset arrival times is discussed, with a focus on new results showing interesting differences in arrival times of Pi1B pulsations, characterized by broadband bursts in the ULF range (periods of 1 to 40 s). Previous work has shown that these pulsations provide an onset signature with timing precision the order of a few seconds and, also, that the ground stations that detect this signature need only be located within a couple hours in MLT of the onset. In a detailed study, observations at nominally conjugate stations (South Pole and Iqaluit) are used to determine differences in substorm onsets in opposite hemispheres. This is a statistical study spanning a few years and includes several tens of events, where the presence of substorms are confirmed using fluxgate magnetometer and other data. The raw results show a wide range in onset times, with no clear seasonal dependence that might indicate a tendency for onset to occur in one hemisphere or the other. For periods of perhaps a few weeks, however, there are times when onset does occur preferentially in one hemisphere, suggesting that coupling is somehow mediated by solar wind parameters.
Engebretson Mark J.
Kim Hungsoo
Lessard Marc R.
Posch J.
Weatherwax Allan T.
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