20190222

Scott asks: How to use autoplot to load ftp://cdaweb.gsfc.nasa.gov/pub/data/rbsp/rbspa/l2/emfisis/hfr/spectra/2012/rbsp-a_hfr-spectra_emfisis-l2_20121202_v1.2.7.cdf?HFR_Spectra, and for the lower panelftp://cdaweb.gsfc.nasa.gov/pub/data/rbsp/rbspa/l3/ect/hope/moments/rel04/2012/rbspa_rel04_ect-hope-mom-l3_20121202_v7.1.0.cdf?Tperp_Tpar_e_3 and then ephemeris ticks L*, MLat, MLT

First plot the first URI by entering it into the address bar and pressing the play button.

The data is loaded.

File->Add Plot... to add a second plot.

Enter the second URI, and let's see what's inside the CDF file.

Whoops, there was a typo in the variable name, so we select Tperp_Tpar_e_30.

And plot to accept the new setting, which will form a new URI.

Here we enter "plot below" to make a new plot below for this URI.

The data loads. Now let's add additional "ephemeris" labels to the ticks.

This brings up a GUI for specifying a URI to load and use for tick labels. We have a bookmark for commonly used RBSP-A ephemeris.

Select the RBSP-A ephemeris, which will come from a "das2server", which is a special server for sending data which Autoplot can work with. Like all Autoplot data, there are URIs for data coming from Das2Servers.

Okay the URI.

The ephemeris ticks are added. Now we need to aggregate the data, so files from any day will be used.

Tools->Aggregate helps us with this.

Note that it changes strings like 20121202 to $Y$m$d. Aggregation is one of Autoplot's key features.

Click "All URIs" to accept these proposals.

Data from surrounding days is now loaded to fill in the hours past midnight.

Now we'll run a PNGWalk.

Tools->Create PNG Walk... is used to run a sequence of pngs for each day.

Select the output location and the time format. The time format implies the step size, and delta is used to increase the step size from 1 hour to 12 hours.

Autoplot runs the PNG Walk, loading data for each image and writing the new plot with each time to a png file.

Note the completion time is estimated (19.8s).

The PNGWalk is shown with the PNGWalk Tool, which lets you quickly flip through images.