Previously in Solar Jet Hunter…
During the first run of the project, solar jet hunters went through three years of data (2011 to 2013) from the AIA instrument of the Solar Dynamic Observatory (SDO), in the 304 A channel. 3937 subjects were analyzed by the volunteers, and jets were found in 852 subjects (22% of the data). For all subjects in which jet have been found, volunteers boxed the jets, providing information on the timing of the jets, the location of their base, and their extent.
We gathered the classifications of the volunteers and worked on the aggregation of these individual classifications to calculate, for each subject, the “averaged” box and base positions. One challenge in this is to be able to distinguish between different jets when more than one jet is present in the subject! Two examples of subjects containing two jets are shown below: the blue boxes represent the averaged boxes for each jet, calculated from the individual boxes reported by solar jet hunters:
Once jets are reported in individual subjects, we compare consecutive subjects to identify jets which continue from one subject to another. By combining subjects to reconstruct the full jet timeline, a total of 289 jets were found! Thanks to the analysis of the solar jet hunters, we will soon publish a preliminary catalog of these jets containing timing, positions, extent, and even velocity information when possible – stay tuned if you would like to see this catalog! Here are some example jets below: you can see how the box size and position change as we follow the jet from one subject to the next one.
The team would like to thank again all the volunteers that participated in the project so far, for their amazing work that led to this great milestone of the project. But that is not all, we are re-launching Solar Jet Hunter, and need your help once again!
Solar Jet Hunter starts again with new data!
We are now re-launching Solar Jet Hunter with new data, starting with solar observations from 2014 and 2015! As before, two parallel workflows exist: the first one is “Jet or Not”, in which the volunteers are asked to report if at least one jet is present in the movie strip. In the past, in this workflow, a subject was seen by three different volunteers before being classified. After looking at the results, we think they will be more accurate if we consider the answers from at least seven volunteers, so that is what will happen from now on! If the majority of the volunteers report that there is a jet in the subject, then the subject will be fed to our second workflow: “Box the jets”.
In “Box the jets”, volunteers are asked to click on the base of the jets at two different moments in time (when the jet appears and just before it disappears), and to draw a box around the jet. If there are two jets, the volunteers can do the same again on the second jet. If there are more than two jets, then, it’s pretty exceptional and the volunteers should report the subject in the talk board!
The new data set contains 2897 subjects: we need your help! Will you join the hunt for solar jets?
Solar Jet Hunter blog 