1. Soteria Capacity Building Workshop
Getting and using SDO/AIA data from ROB
15-16 Feb. 2011
Soteria Capacity Building Workshop

2. Soteria Capacity Building Workshop
What's new?
A lot is the same!
FITS files, keywords
Access via SolarSoft or direct
But...
There are more images than you need
The data is arranged in "series", which still very coarse
The data files are larger
So we'll talk about
Finding data
Using SolarSoft to select and get data
15-16 Feb. 2011
Soteria Capacity Building Workshop

3. For those with internet
Links and examples
Examples as files
15-16 Feb. 2011
Soteria Capacity Building Workshop

4. Soteria Capacity Building Workshop
Let's do it
File first.pro
Find some data
Download it from ROB
Extract FITS header and decompress image
Plot the image
list=vso_search('6-dec :00','6-dec :20',sample=120,inst='aia',wave='171')
help, list[0], /struct
status=vso_get(list[0:2],pixels=4096,/rice,site='rob',filenames=files)
help, files
read_sdo, files[0], hdr, img
help, hdr, img
plot_image, img
15-16 Feb. 2011
Soteria Capacity Building Workshop

5. Soteria Capacity Building Workshop
Behind the scenes
Asked VSO for a set of file descriptors applicable anywhere
Asked ROB for these files
This time we got them, but ROB will request them, and you might also try someone else
The same file from all archives
JSOC
ROB
Data
Metadata/Data
Metadata
VSO
User
Metadata
15-16 Feb. 2011
Soteria Capacity Building Workshop

6. Soteria Capacity Building Workshop
Finding data
Browse images with
Helioviewer
Explore collections with
lookdata
15-16 Feb. 2011
Soteria Capacity Building Workshop

7. Using the VSO to get data
Prerequisites :
Update your SolarSoft to for example allow Rice compression
Include the "instruments" with something like
setenv SSW_INSTR "eit secchi scc vso aia hmi"
15-16 Feb. 2011
Soteria Capacity Building Workshop

8. Some more detailed examples
File hmi_too.pro
Other selection keys are possible
The metadata also allows selection
We can see automatically generated filenames
File basic.pro
We can (and probably must) filter using the metadata
We can choose where to send the files
15-16 Feb. 2011
Soteria Capacity Building Workshop

9. So, some useful keywords are
inst - AIA or HMI - but all of the data!
physobs - problem is AIA is always intensity
site - where to get the data
pixels - which resolution to request
sample - the cadence in seconds
filenames - what names will be used
wave - wavelength
/rice - unless you like huge files!
15-16 Feb. 2011
Soteria Capacity Building Workshop

10. But for AIA you probably need the metadata
The data is arranged in series with common FITS format and common level of processing
The series is in the vso_search() FILEID field
aia__lev1 <-> aia.lev1 - link list is later
Plus you probably need sample=NNN and wave=NNN
15-16 Feb. 2011
Soteria Capacity Building Workshop

11. So putting it all together
File aiacalib.pro
Request a range
Select
Download
Decompress
Calibrate
Plot
15-16 Feb. 2011
Soteria Capacity Building Workshop

12. Links and code for today
Using data page at wissdom.oma.be
15-16 Feb. 2011
Soteria Capacity Building Workshop