Remote Data Reduction with CHARA
For remote data reduction, we are running a virtual machine on the CHARA server in Atlanta. This machine currently has the redclimb and redfluor data reduction packages installed as well as the packages for the PAVO and MIRC-X beam combiners.
Arranging Access to the Remote Data Reduction Machine
Connecting to the Remote Data Reduction Machine
- Download and install a VNC viewer. We recommend tigervnc because of the viewers we’ve tested, it runs the fastest. Others do work, though.
- If using tigervnc's viewer, run the vncviewer command. This should open a window that looks like this:
- Input the address you are given into the "VNC server" prompt. This should bring up a password prompt. This will connect you to the Atlanta remote observing machine.
- If you get the error "unable to connect to host: Connection timed out (10060)", you are likely behind a firewall and should try again from another network or get in touch with your IT team to open up the 5900 range of ports (5900-5999).
- If it is your first time accessing the system, we recommend changing the automatically generated passwords. To change your password for your VNC server, run the command “vncpasswd” and to change your account password, use the command “passwd”.
Finding the Data
Once logged on, you can find the data in the /dbstorage/ directory. From there, it is organized by beam combiner. CLIMB, Classic, JouFLU, and miscellaneous CHARA data are in the /dbstorage/Cl_CL_JF/ directory. The rest are self-explanatory. Data are proprietary within 18 months, so if you have any data from that time period, make sure to note it in your access form or email Jeremy. If you wish to access another PI’s proprietary data, we will, of course, need their permission. Once we have that, we will give you access to it. Older data are freely accessible.
Reducing your Data
Classic/JouFLU Data Reduction
We recommend that you use redfluor for Classic/JouFLU reduction. A tutorial can be found here.
Note: Make sure to use the –D flag to indicate the destination for the reduced files as you will not have write permissions in the data directory.
CLIMB Data Reduction
We recommend using John Monnier's IDL pipeline to reduce CLIMB data. A tutorial for how to reduce CLIMB data on the CHARA Remote Data Reduction Machine was written by Kathryn Lester.
Note: Run start_climb.script from a local working directory and not the raw data directory.
The redclimb pipeline is also available for reducing CLIMB data. More information can be found here.
Note: When using redclimb, make sure to use the –D flag to indicate the destination for the reduced files as you will not have write permissions in the data directory. We will be providing John Monnier’s IDL pipeline soon.
PAVO Data Reduction
A tutorial for reducing PAVO data with the CHARA Remote Data Reduction Machine can be found here. All of the IDL scripts are installed and available. To access them, run ‘pavo_idl’. We will run headstrip.pro on each night’s data as it comes in.
MIRCX Data Reduction
The new MIRCX pipeline is installed. Documentation can be found here.
When running the MIRCX pipeline on the Remote Data Reduction Machine, run the following command:
This will set path variables to point to the MIRCX reduction pipeline and start a virtual environment for python with all the prerequisites installed.
Note: Run mircx_reduce.py from a local working directory and not the raw data directory.
For old MIRC data prior to the MIRC-X upgrades, use the IDL pipeline. A tutorial can be found here.
See the 2020 CHARA Summer Seminar page to view presentations on observing and reducing data from each of the beam combiners.