Shocks and CMEs observed by Ulysses during solar maximum

Details Shocks and CMEs observed by Ulysses during solar maximum Shocks and CMEs observed by Ulysses during solar maximum

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12b0763r&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12B-0763

Physics

2102 Corotating Streams, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2162 Solar Cycle Variations (7536), 7513 Coronal Mass Ejections

Scientific paper

By December 2001, Ulysses will have nearly completed the northern polar passage of its second orbit. The solar wind structure observed thus far in Ulysses' second orbit is markedly different from that observed over the first. During the second polar orbit, coinciding with solar maximum and the period surrounding it, the solar wind observed at all latitudes is highly irregular. One question to be asked is: despite its irregularity, are there any latitudinal dependences in the observed structure? With Ulysses' completion of the rapid latitude scan, we are now able to verify trends suggested in previous work and report some new ones. Here we focus on transient events: shocks and CMEs. Stream interaction regions (SIRs) and CMEs are observed at all latitudes. Forward and reverse shocks are often associated with the SIRs up to the highest latitudes, but the shock strength drops with increasing latitude. CMEs often drive forward shocks but no reverse shocks. None of the solar maximum CMEs show the characteristic of over-expansion observed during the first orbit. As Ulysses approached high southern latitudes, the CME rate dropped with increasing latitude. Interestingly, as Ulysses returned to lower latitudes during the rapid latitude scan, although the CME rate recovered somewhat, it did not return to the level observed before the southern polar pass. This may indicate the onset of the declining phase of the solar cycle.

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