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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0400

The solar wind outflow in coronal holes

plan term


@ @


 name : Hofmeister @  e-mail : stefan.hofmeister[at]uni-graz.at

contact person in HINODE team

 name : Matthews, Culhane @  e-mail : sarah.matthews[at]ucl.ac.uk, j.culhane[at]ucl.ac.uk

 abstract of observational proposal
Main Objective: Study of solar wind outflow in the individual magnetic funnels within coronal holes

Scientific Justification: High-speed solar wind streams are originally accelerated in magnetic funnels within coronal holes; distinguishing distinctly the individual magnetic funnels, however, is a difficult task. We approach this task by coordinated observations of BBSO/GST with IRIS and Hinode to track the individual magnetic funnels within coronal holes from the photosphere to the low corona, using magnetic field data in the photosphere and chromosphere, high- and low- FIP element abundances, and density and outflow maps. Combining these three observatories will allow us to determine how the solar wind velocity, temperature, and mass flux in the low corona depends on the properties of the individual magnetic funnels, i.e, their foot-point magnetic field strength, size, expansion factor, their magnetic environment, and their distance to the coronal hole boundary purely from observations. These results shall be later used to relate remote-observations of individual magnetic funnels in the low corona to in-situ observations taken by Parker Solar Probe.

 request to SOT

 request to XRT
All available filters with maximum exposure time at the beginning and end of the observations. In between: Al-mesh and Al-poly at a cadence of 1 min. FOV: 512"x512", centered at the target.  

 request to EIS
Study: CH_funnels_FIP
Target: Coronal hole
No. of rasters: 1
Raster #1:
ACRONYM: Cool_lines_+FIP
Raster type: scanning
Slit: 2"
Compression: DPCM
Window Height: 512 px
Number of Pointings: 199
FM Step size: 2"
Number of Exposures/step: 1
Exposure times: 60 seconds
Delay times: 0 seconds
Line List:
Line(s) Central wavelength (A)
2x O VI 184.05
Fe VIII + Fe XII 186.75
Fe XI 188.23
Fe XI 189.12
Fe IX + Fe X 189.87
S XI 191.27
Ca XVII + O V 192.82
Fe XII 193.54
Fe XII 195.12
S VIII 198.55
Fe XIII 202.04
S VIII 202.74
Fe XIII 203.82
O V 248.46
Al VIII 250.14
He II 256.32
Fe X 257.26
Si X 258.37
Si X 261.04
S X 264.23
Mg VI 269.05
Si VII 272.65
Si VII 275.35
Mg V 276.57
2x O IV 279.75
Size: ~80 MByte

 other participating instruments
IRIS requests:  
Proposal has been accepted to IRIS. IRIS ObsID 3821854096


Dates:  ToO. Coordinated with IRIS and BBSO/GST.  
Time window:  Shall be arranged with BBSO/GST. We need 4 hours of observing time without interruption on at least one day, at a daytime of good ground-based observing conditions (morning/evening).

Target(s) of interest:  Low-latitude coronal hole with a size of about 300"x400", with a maximum distance of 500" to the disk center.

Additional remarks:  
The observations shall cover a full coronal hole, carried out by a coordinated mosaic-scan of BBSO/GST, IRIS, and Hinode (total scan size: ca. 500hx400h).  
We request the limb-mode allocation for Hinode/EIS.  

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