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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 you search only the CEDAR 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 "Millstone Hill IS Poker Flat Radar", and for a time period choose February 2018January 2020. Then hit "List experiments".You will notice that every time period is repeated four times. There are copies on the same experiment both on the CEDAR site and the Millstone site. For each experiment, there is also the standard processing, and alternate processing that you can ignore for now.
- Choose the standard version of the Feb 6, 2018 experiment from the CEDAR site with experiment name "Wide Coverage East Azimuth Scan and Regional Vector Experiment". If the background blue color disappears, you have accidentally selected the Millstone Madrigal 2 site - hit the back button and try again."IPY27_Tracking_v03" of the Jan 1-2, 2020 experiment.
- 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 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. 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 For now choose one of the Long Pulse (480) files 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. For this experiment, choose "Summary plots - electron density".In this experiment, the Millstone Hill was looking in a number of directions 1) zenith, 2) 45 elevation, azimuth 135, 3) 45 elevation, azimuth 45. Finally, the radar was also scanning across a range of azimuths with a constant elevation of 6 degrees. If you are familiar with Google Earth or install the Google Earth plug in on your browser, you can see this scan's data displayed in a Google Earth environment Look at a sample of the plots.
- 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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Choose Data Access -> Select single experiment from either of the two Madrigal sites listed above.
- Leave "Use all Madrigal sites" selected so you search over all Madrigal sites.
- For "Instrument category" choose choose "Fabry-Perots".
- Select the "Arecibo Imaging Doppler Fabry-Perot".
- Select year 2018, month January, and day 15.
- Note that from this point on, the options are similar to the List experiment user interface.
- This time we will print the file with and without filters. Select the one file listed, then choose "Print file" and "As is".
- Next we will print the file, but filter by data quality. To learn about data quality, choose "Show plots" and "Description of data quality (FPI_DATAQUAL) parameter".
- Next choose "Print file" and "Select parameters/filters".
- Open the "Select Parameters to include" section by clicking on it.
- Click or hover on any of the parameters to see its definition.
- You could select any parameters to print, including derived ones in grey. For now select just the parameters in the file by clicking "Select all parms in original file" at the top.
- Close "Select Parameters to include" section by clicking on it, and open "Select filters to use (optional)".
- In the bottom section select or type "FPI_DATAQUAL" as the filter parameter. Leave the lower limit blank, and set the upper limit to 0. This will remove all data with values above 0.
- Verify the resultant output only has values of 0 for FPI_DATAQUAL.
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