Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640230l&link_type=abstract
American Astronomical Society, AAS Meeting #216, #402.30
Astronomy and Astrophysics
Astronomy
Scientific paper
Global coronal EUV waves are useful diagnostic tools for physical conditions on the Sun. Major drawbacks that hindered our understanding of EUV waves were previous instruments' low cadence (e.g., 12 minutes for SoHO/EIT) and limited spatial resolution and wavelength coverage. The Atmospheric Imaging Assembly (AIA) on board the recently launched Solar Dynamics Observatory (SDO), joined by the STEREO EUV Imager (EUVI), offers a great chance to end the decade long debate on the nature of global EUV waves. AIA observes the corona at 10 EUV and UV wavelengths, covering a wide range of temperatures. It has high resolution (0.6") and cadence (20 s, 7 times faster than EUVI). These capabilities allow us to study the thermal structure and kinematics of EUV waves in unprecedented detail. We present here the first AIA observations of an EUV wave occurring on 2010 April 8. AIA observed this event on the solar disk, while the STEREO Ahead (A) and Behind (B) spacecraft, which were 67 degree ahead and 72 degree behind the Earth, respectively, provided side views of both the EUV wave and the halo coronal mass ejection (seen by SoHO/LASCO) near the limb. This formed a double quadrature configuration with great advantages to infer the 3D structure. Initial analysis indicates that this wave exhibited strong anisotropy, propagating primarily toward the south, on the same side of the erupting loop system. We will examine its spatial and temporal relationship with the erupting loop and CME and discuss physical implications.
Liu Wei
Nitta Nariaki V.
Schrijver Carolus J.
Title Alan M.
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