Solar Physics Division Meeting 2000, June 19-22
Session 2. Corona, Solar Wind, Flares, CMEs, Solar-stellar, Instrumentation, Other
Display, Chair: J. Krall, Monday-Thursday, June 19, 2000, 8:00am-6:00pm, Forum Ballroom

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[2.72] Eruptive Events at 304 Å: A Sample from SOHO EIT

J.B. Gurman (NASA Goddard space Flight Center, Laboratory for Astronomy and Solar Physics)

Although the SOHO Extreme ultraviolet Imaging Telescope (EIT) is normally used to monitor the full disk at 195 Å\ with a 12-minute cadence, we make use of occasional opportunities to observe in the He II Ly \alpha resonance line at 303.7 Å\ (with some contribution from Si XI 303.4 Å) at a somewhat higher cadence. At the current phase of the solar cycle, this affords us the opportunity of amassing some statistics on various kinds of activity observable at 304 Å.

I report here on the limb activity visible in these data, including surges, sprays, eruptive prominences, and two classes of phenomena which may not correspond to the classical H I Ba \alpha nomenclature for eruptive events: loop sprays and fan jets. The former resemble flare sprays but appear to travel along pre-existing coronal loops, while the latter are not clearly associated with flares, and may represent a manifestation of coronal mass ejections at chromospheric temperatures.

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