CO5BOLD hydrodynamic Quiet Sun model
This is an early model atmosphere extending into the chromosphere calculated with CO5BOLD in 2001-2003 and published in Wedemeyer et al. (2004). The model has no magnetic field included and uses grey (i.e., frequency-independent) radiative transfer and can thus be understood as simplified (very) quiet Sun model. Time series of synthetic mm continuum intensity maps have been published by Wedemeyer-B. et al. (2007) (therein referred to as model A, W04).
Model properties
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Target: (very) quiet Sun (no magnetic fields)
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Time series with 60 snapshots, cadence = 10s
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Dimensions (x,y,z): 5.6 Mm x 5.6 mm x 3.1 Mm
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Grid points: 140 x 140 x 200
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Height range (z): -1377.30 km (bottom, convection zone) to +1705.30 km (top, chromosphere)
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Grid resolution: horizontal: 40 km, vertical: 46 km at the bottom in the convection zone decreasing to 12 km for all layers above z = −270 km.
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Magnetic field: none
Available model data
A total of 60 time steps with a cadence of 10s are currently provided.
All data can be downloaded from the directory http://astro-ursafs.uio.no/vol/ssalmon/co5bold_w04hdgr_seq1/. There is a g'zipped tar file for each time step, which contains 7 FITS files each. Each of these FITS files contains a data cube of dimensions 140x140x200 for one of the physical quantities in the table below. The FITS files are named like this: co5bold_w04hdgr_seq1_itXXX_YY.fits where XXX is the number of the time step (e.g., 000) and YY the physical quantity (e.g., tg, see the column "symbol" in the table below). For instance, co5bold_w04hdgr_seq1_it008_vz.fits contains the vertical velocity component in time step it=008 and is included in the file co5bold_w04hdgr_seq1_it008.tar.gz. Each tar.gz file has a size of 93MB and the whole sequence thus 5.5 GB. The height axis is provided in a separate FITS file.
The whole sequence can be downloaded as a single tar.gz file: http://astro-sdc-db.uio.no/vol/ssalmon/co5bold_w04hdgr_seq1/co5bold_w04hdgr_seq1_all.tar.gz. (Please note that this file has a size of 5.5 GB!)
| Quantity | Symbol | Unit |
|---|---|---|
| Gas density | rh | g/cm3 |
| Interal energy | ei | erg/g |
| Gas temperature | tg | K |
| Gas pressure | pg | dyn/cm2 |
| Velocity, x-component | vx | cm/s |
| Velocity, y-component | vy | cm/s |
| Velocity, z-component | vz | cm/s |
| Height axis (file: co5bold_w04hdgr_seq1_z.fits) | z | km |
| Time (file: co5bold_w04hdgr_seq1_time.fits) | time | s |
How to load the data in IDL: After downloading, simply use the READFITS function, e.g.:
data=READFITS([filename])
If the file is found, the variable "data" will contain an array (here 3D) for the corresponding physical quantity.
Axes (cell centers) in units of km:
x=findgen(140) * 40.0 + 20.0 y=findgen(140) * 40.0 + 20.0
The height axis in units of km (cell centers) is contained in this file: co5bold_w04hdgr_seq1_z.fits
The exact times of the snapshots in seconds are contained in this file: co5bold_w04hdgr_seq1_time.fits
Synthetic observables
- Continuum intensity images for 0.3mm, 1.0mm, 3.0mm and 9.0mm and different view angles from mu=1.0 (disk-centre) to mu=0.2 (close to the solar limb); sequence of 60 snapshots with 10s cadence. See here.
Simulated ALMA observations
- To be added.