Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh54d..03j&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH54D-03
Astronomy and Astrophysics
Astrophysics
[6954] Radio Science / Radio Astronomy, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions
Scientific paper
From the time that type III metric radio-wave activity has been known, and imaged, there has been a realization that this activity often increases during, and for some events from a few minutes to several hours prior to the major manifestations observed for a flare or Coronal Mass Ejection (CME). We review these analyses from as long ago as the observations from Culgoora, Australia, and more recently from the French Nancay radio observatory. We find there can be precursor activity before a flare or CME as indicated by the increasing numbers of isolated type III bursts, and that this can be a maximum prior to the most obvious manifestation of either the surface flare or the most obvious rapid outward coronal motion of a CME. Current imaging measurements from the Nancay radio array further clarify the location of this activity for specific events such as the 26 April 2008 CME that was observed just following the Whole Heliosphere Interval (WHI) near the time of solar minimum. A plausible explanation for this precursor activity exists, and we expect that this idea can be more fully tested using present-day observations. As solar activity increases and more observations become available from, for instance, the Murchison Widefield Array (MWA) now under construction in Western Australia, far better worldwide temporal coverage for this type of analysis will exist. In conjunction with current NASA instrumentation such as the Solar TErrestrial RElations Observatory (STEREO) and SOlar and Heliospheric Observatory (SOHO) coronagraphs, and the Solar Dynamics Observatory (SDO), we expect a significant improvement in our understanding of this unique flare and CME precursor activity.
Buffington Andrew
Hick Pierre P.
Jackson Bernard V.
Matthews Lynn Diane
Oberoi Divya
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