MDI is no longer operational. It operated from 1996-2010. So your query for 2015 comes up empty. The successor instrument is called HMI, which returns 4096^2

MDI is no longer operational. It operated from 1996-2010. So your query for 2015 comes up empty. The successor instrument is called HMI, which returns 4096^2 images on a pretty fast cadence (45s or 720s depending on your purposes). It is much superior to MDI. The HMI instrument team is at Stanford University, so I'd point you there for data rather than to the NASA site, which offers a lot of sources and seems to suffer from a least-common-denominator effect. Recent HMI quick look products are here: http://jsoc.stanford.edu/data/hmi/images/latest/ http://jsoc.stanford.edu/data/hmi/images/latest/ There is a back-catalog of JPEG images for browsing: http://hmi.stanford.edu/data/hmiimage.html http://hmi.stanford.edu/data/hmiimage.html For science purposes, you can get FITS data from http://jsoc.stanford.edu http://jsoc.stanford.edu . There are a lot of data products -- intensity, magnetic field (line-of-sight and vector), velocity, tracked regions, etc., as well as near-real-time analogs of much of this data (not as well-calibrated, but arrives within a couple hours of being taken). There is no embargo on this data. They just expect acknowledgement (http://sdo.gsfc.nasa.gov/data/rules.php http://sdo.gsfc.nasa.gov/data/rules.php).