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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0123

Global coronal waves watch

plan term




 name : Attrill, Wills-Davey    e-mail : gattrill[at]cfa.harvard.edu

contact person in HINODE team

 name : Attrill    e-mail : gattrill[at]cfa.harvard.edu

 abstract of observational proposal
Global coronal waves are observed in the quiet Sun, expanding away from a source region, which is often an active region. Coronal waves have a canonical velocity of 250 km/s, but this can vary greatly from event to event, with velocities ranging from 25 ・438 km/s. They are closely associated with CMEs (there is no such association with flares, so that coronal waves are observed to occur independent of the occurrence of a substantial flare).

The physical mechanism(s) generating the bright fronts remain to be firmly established. Observations of coronal wave fronts (and their associated coronal dimmings that occur behind the bright front) are required to progress our understanding. Multi-temperature observations of a coronal wave bright front from Hinode/XRT, spectral diagnostics from EIS and relation of the bright front to the magnetic field using SOT data, can potentially place significant constraints on the physical mechanisms currently under consideration.

 request to SOT
Line-of-sight SOT data of the quiet Sun region being observed would also be  complimentary, to identify any magnetic concentrations in the quiet Sun region that may be linked with particular brightening(s) in the coronal wave bright front.

 request to XRT
Large (1024x1024) field-of-view XRT observations, at reasonably high (less than 5 minute) temporal cadence are required. The thinner XRT filters, such as Al-Poly or Ti-Poly are most suitable for detecting the faint coronal wave bright front. Long exposures will be needed for this study (AEC setting), to image the faint diffuse bright front in the quiet Sun. Binning is acceptable.

 request to EIS
There is a complimentary EIS study designed for observing coronal wave bright fronts: study ID # 140, coronal_wave_study, which has already been run by EIS.

 other participating instruments


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