Origins of the Solar Polar Jets - Coordinated SOHO and TRACE Observations

Details Origins of the Solar Polar Jets - Coordinated SOHO and TRACE Observations Origins of the Solar Polar Jets - Coordinated SOHO and TRACE Observations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh22a0187d&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH22A-0187

Other

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind

Scientific paper

The polar jets are dynamic coronal eruptions originating in the low solar atmosphere, in flaring UV bright points within polar coronal holes. They were first observed by SOHO instruments (EIT, LASCO) during last solar minimum in 1996 when the polar holes were dominating coronal structures. UVCS/SOHO obtained ultraviolet spectroscopy of the jet providing us with estimates of the jet plasma conditions, evolution of the electron temperature and heating rate required to reproduce the observed ionization state. As the Sun is currently at the declining phase of its activity, the polar holes again became permanent structures. The SOHO Joint Observing Program (JOP 155) was designed to identify and study the jet phenomena that would be counterparts of the solar minimum polar jets. The jets are believed to be triggered by field line reconnection between emerging magnetic dipole and pre-existing unipolar field. Existing models predict that the hot jet is ejected together with another jet of a cool material. The particular goal of the coordinated SOHO and TRACE observations was to look for possible association of the hot and cool plasma ejections. We present first results of the campaign and discuss their implications.

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