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Data Access -> List Experiments
In the List Experiments, you can list experiments to choose from. This interface allows you to look either at ALL Madrigal sites, or just the local one.
Choose Data Access -> List experiments from either of the two Madrigal sites listed above.
- If this is the first time you have used Madrigal, you will be redirected to a page where you set up a cookie with your name, email, and affiliation. Madrigal does not require passwords, but your data downloading is logged based on your cookie. When you have finished with that form, again choose Data Access -> List experiments.
- Uncheck "Use all Madrigal sites" so selected so you only search only the CEDAR over this Madrigal site.
- For "Instrument category" choose "Incoherent Scatter Radars".
- Briefly look through the list of incoherent scatter radars for which there is data on Madrigal.
- Select the "Poker Flat Millstone Hill IS Radar", and for a time period choose January 2020February 2019. Then hit "List experiments".
- You will notice that every time period is repeated three times. There is a standard experiment, a plasma line experiment, and a "Alternate processing using USRP receiver - not for science use". Ignore the Alternate experiment, and only use the plasma line and standard experiments.
- Choose the "IPY27_Tracking_v03" of the Jan 1-2, 2020 experiment.standard version of the Feb 2, 2019 experiment with experiment name "World Day - Bubbles".
- Look at the top line. This lists the principle investigator of this data set. Contact them as soon as you consider using their data in a paper! If If you are really interested in an experiment or an instrument, you can sign up to be notified when that experiment or instrument is updated.
- Click Click on the "Select file" pull-down menu. You will notice there are numerous different files associated with this experiment. For now choose one of the Long Pulse (480) files . This is explained in detail in the Millstone Hill overview document. Basically there is a combined file, and then smaller files with subsets of that combined files, along with derived velocity files and a gridded file where complex measurements are reduced to a standard grid for use by modelers. For now choose the "Combined basic parameters file" listed first.
- Choose the "Show Plots" button. This will list all the plots and other documentation the instrument principal investigator added to Madrigal to help users understand the data. Look at a sample of the plots. For this experiment, choose "Summary plots - electron density".
- In this experiment, the steerable antenna was pointing one way, and the zenith was pointing straight up (it is not steerable). Each radar is running two modes - single pulse and alternating code. The alternating code has better spatial resolution, and so is used to plot the E region. The single pulse goes higher, and so is used in the F region plot.
- Select the "View File Info" button. This will list the descriptive text embedded in the Hdf5 or netCDF4 versions of this file.
- Select the "Cite this file" button. This will create a full citation with a permanent w3id.org based url which can be used as a data citation in a publication that uses this data file.
- Click the "Download File" button. You will see two options "As is" and "Select parameters/filters". For now select "As is". This means you are downloading the file as created the instrument principal investigator. This offers less flexibility than "Select parameters/filters" but is often much faster.
- Choose any of the three formats, and download that file.
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Data Access -> Select Single Experiment
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