Eruptive Events at 304 Angstroms: A Sample from SOHO EIT

Details Eruptive Events at 304 Angstroms: A Sample from SOHO EIT Eruptive Events at 304 Angstroms: A Sample from SOHO EIT

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0272g&link_type=abstract

American Astronomical Society, SPD Meeting #31, #02.72; Bulletin of the American Astronomical Society, Vol. 32, p.824

Statistics

Scientific paper

Although the SOHO Extreme ultraviolet Imaging Telescope (EIT) is normally used to monitor the full disk at 195 Angstroms with a 12-minute cadence, we make use of occasional opportunities to observe in the He II Ly α resonance line at 303.7 Angstroms (with some contribution from Si XI 303.4 Angstroms) 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 Angstroms. 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 α 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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