...
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 "Poker Flat Radar", and for a time period choose January 2020. Then hit "List experiments".
- Choose the "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.
- 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.
...