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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0121

CORE: The Transition Corona

plan term


@ @


 name : De Luca @  e-mail : deluca[at]head.cfa.harvard.edu

contact person in HINODE team

 name : Golub @  e-mail : golub[at]head.cfa.harvard.edu

 abstract of observational proposal
The "transition corona" is the interface between the closed, strong magnetic fields of the inner corona, and the open fields of the outer corona. The key thing is that when we look at the XRT observations of active regions at the limb, the space above the ARs does not look at all the way one would expected it to. Based on white light observations, we should see larger and larger closed field loops, eventually becomeing cusp-shaped helmet streamers. But the X-ray regions don't look like that at all. An example of what we see is here:
We propose a joint observation program between Hinode and CORONAS/
PHOTON TESIS to study the transition corona in detail at multiple wavelengths.

 request to SOT
When the AR is at the limb. CaII and H-alpha observations to define the chromospheric boundary and identify any prominence material. Cadence of 1-10 minutes for the duration of the observation period (~6hrs) would be sufficient.

 request to XRT
Long/short image pairs in C-Poly or Be_thin.
512x512 full resolution images.
6hr duration

 request to EIS
Slot images above limb. Read lines that overlap the TESIS passbands where possible.

 other participating instruments
CORONAS/PHOTON TESIS - Coronal imaging in MgXII and EUV
passbands. EUV observations of extended off-limb corona.

This is a Target of Opportunity (TOO) proposal - requires and AR near  
the limb.

Observations on the west limb are preferred as coordination with TESIS will be easier. We assume that SOT will take vector magnetic field observations of AR  
as they cross the solar disk. These are key to modeling the AR fields and comparing models with the limb observation.

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