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J.G. Doyle

The solar group continues to make excellent use of both existing and new data from the SoHO satellite, in particular, data from the SUMER, CDS, EIT and MDI instruments, in addition to data from the TRACE satellite. Topics investigated include ultraviolet (UV) explosive events, UV/X-ray bright points, evidence for magnetic reconnection, plus a new proposed blinker model. The overall location of these different events within the wider framework of the outer solar atmosphere, and in particular their relationship with the hotter corona and the cooler chromosphere is poorly known. Within the solar group we have: Eoghan O'Shea (PDRA employed under CosmoGrid), Chia-Hsien Lin (PDRA, also employed under CosmoGrid), Youra Taroyan (PDRA employed under a PPARC grant), Ignacio Ugarte Urra (final year PhD student who successfully completed his thesis in December 2004), Miruna Popescu (second year PhD student) and Bebe Ishak (first year PhD student).

A new line of investigation was started in late 2004, i.e. the origin of radio emission from brown dwarfs. To date, radio emission has been reported for a few brown dwarfs at luminosities that violate our understanding of traditional coronal emission. Identifying the actual emission process is proving difficult due to the small number of known radio active sources. With a new PhD student (Antoaneta Antonova) we have started to investigate this in three ways: a re-analysis of VLA data taken for several brown dwarfs in 2001 (where only upper limits were reported) using a phase-only self-calibration method; applying for new VLA time; and thirdly, an EVN proposal to hopefully resolve the source of the radio emission. This topic will be reported in more detail next year.



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Next: Explosive Events Up: Technical Research Summaries Previous: Dynamics of Co-orbital Satellites   Contents