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Hinode EIS data
This page describes access to Hinode EIS data via AstroGrid
1 Hinode EIS
The Hinode spacecraft was launched on 22nd September 2006 from Japan. Data from its EUV Imaging Spectrometer (EIS) built by MSSL are now available via AstroGrid. Further details on the instrument can be found on the Hinode EIS Website.
2 Data Access via HelioScope
Hinode EIS Level 0 and Level 2 data files can be accessed via the HelioScope service.
HelioScope is launched from the AstroGrid Workbench. Follow this link for help in downloading and setting up the Workbench.
After launching HelioScope, you can specify a time range of interest for your data search. HelioScope will simultaneosly query several Solar and Heliospheric data archives, including the MSSL EIS archive. Follow the instructions at the HelioScope help page to download Level 0 and/or Level 2 Hinode EIS data files.
3 Data access via ADQL queries
It is also be possible to send more complex queries than the simple time range query allowed by HelioScope, to the Hinode EIS database. This is achieved by using the Task Launcher to send a query on any of the EIS FITS Headers. The query needs to be formulated in ADQL (Astronomy Data Query Language), which is similar to SQL.
3.1 EIS database tables
The EIS database contains several tables. eis_level0 is the catalogue of Level 0 fits headers and eis_level2 of the Level 2 fits headers; it is also possible to send a query to the catalogue of thumbnail images (eis_thumbs) and that of EIS science studies (eis_studies).
3.2 Example queries
Here are examples of ADQL queries on the Level 0 fits header database:
Select * From eis_level0 as t1 where t1.DATE_OBS > '2007-03-03T00:00:00' and t1.DATE_OBS < '2007-03-03T12:00:00'
This is the basic time range query that is equivalent to a HelioScope search.
Select * from eis_level0 as t1 where t1.DATE_OBS > '2007-03-03T00:00:00' and t1.DATE_OBS < '2007-04-03T00:00:00' and POWER( t1.XCEN , 2) + POWER( t1.YCEN , 2) > 640000.0
This query returns all entries the database within the specified time range and with values of the square of xcen + square of ycen greater than a cutoff. This is a positional query requesting observations near the solar limb.
3.3 How to send an ADQL query using Task Launcher
- Follow this link for help in downloading and launching the AstroGrid Workbench.
- Once Workbench is running click on the Task Launcher icon.
- Search for 'hinode' . Select 'AstroGrid DSA/Hinode EIS Level 0 and 2' by clicking on the box to the left of the name. This will take you to the Query Builder.
- Once the Query Builder appears, click on the Adql/s tab. Now you can type in your query as a string. If you click on the name of one of the tables on the rhs, you can see a list of the keywords you can query on
- To submit the query click on the green icon. This will open a Lookout window.
To view the results launch Topcat . Then in the Lookout window put your mouse over 'Result' in the bottom right corner and choose 'To Topcat' 'as Votable'.
The image below is a plot made with Topcat showing the results of the positional query given above, for limb observations.
