Heliophysics Application Programmer’s Interface

SPEDAS provides easy access to data on servers which implement the Heliophysics Application Programmer’s Interface [1] via the command-line routine: hapi_load_data.

Command-line

Keywords

server (required): specify the HAPI server to connect to

capabilities: list the server capabilities

catalog: list the datasets available on the server

info: return information on a dataset

trange: two element array specifying the time range for the dataset you would like to download

parameters: restrict the parameters in the dataset to just those requested in this keyword

Examples

To list a server's capabilities:

<syntaxhighlight lang="idl"> IDL> hapi_load_data, /capabilities, server='http://datashop.elasticbeanstalk.com/hapi' </syntaxhighlight>

To list the datasets available on this server:

<syntaxhighlight lang="idl"> IDL> hapi_load_data, /catalog, server='http://datashop.elasticbeanstalk.com/hapi' </syntaxhighlight>

To get informaton on a dataset:

<syntaxhighlight lang="idl"> IDL> hapi_load_data, /info, dataset='spase://VEPO/NumericalData/Voyager1/LECP/Flux.Proton.PT1H', server='http://datashop.elasticbeanstalk.com/hapi' </syntaxhighlight>

Load and plot some Voyager 1 proton flux data:

<syntaxhighlight lang="idl"> IDL> hapi_load_data, trange=['77-09-27', '78-01-20'], dataset='spase://VEPO/NumericalData/Voyager1/LECP/Flux.Proton.PT1H', server='http://datashop.elasticbeanstalk.com/hapi' IDL> tplot, 'flux' </syntaxhighlight>

SPEDAS GUI

In addition to the command-line access to HAPI servers, the SPEDAS GUI allows users to load data from HAPI servers with an easy to use GUI interface. In the GUI, go to "File" -> "Load Data using HAPI", then (1) select your HAPI server, (2) load the datasets from it, select one of the datasets and either get the dataset information (3) and/or (4) select the time range for the dataset; finally, click "Load Data" to load the data into GUI variables.