The CARMA data archive at http://carma-server.ncsa.uiuc.edu:8181/ provides a web interface to retrieve your data. Once you have located your data, there are two primary ways to download the data to your personal computer. The first is through a Java Web Start (jsp) application. Once launched (you may have to teach your browser where javaws6.1is located) and before the list of datasets has been displayed in DaRT, click on the Download button in that java application to start the transfer. The second method would be to right click on the dataset names and use your browser to download the data. Notice that these file are gzip compressed tar files, and need to be un-tarred to become a real MIRIAD dataset (i.e. a directory):
% tar zxf cx012.SS433.2006sep07.1.miriad.tar.gz
this creates a directory cx012.SS433.2006sep07.1.miriad which we refer to as a miriad dataset. The MIRIAD program itemize lists the items in this dataset. It is also a good sanity check if your dataset appears intact.
% itemize in=cx012.SS433.2006sep07.1.miriad Itemize: Version 22-jun-02 obstype = crosscorrelation nwcorr = 573768 ncorr = 8606520 vislen = 48204056 flags (integer data, 277630 elements) visdata (binary data, 48204052 elements) wflags (integer data, 18509 elements) vartable (text data, 632 elements) history (text data, 1095356 elements)
The drawback of this download scheme is that you initially need about twice the diskspace. You can also use the streaming capabilities of programs like wget or curl to transfer and un-tar on the fly, if you know how to construct the URL from the dataset names you saw on that Data Archive page:
% set base=http://carma-server.ncsa.uiuc.edu:8181/data/ % set data=cx012.SS433.2006sep07.1.miriad.tar.gz % wget -O - $base/$data | tar zxf - or % curl $base/$data | tar zxf -
This procedure will only work for recent data that are in the cache, for example all the ``Tracks Transferred within The Last Two Days'' listed on the Quick Searches page fall under this category.