Explosive Events: Week In Summary

This plot shows the number of events boxed per year as well as the number of images per year.

The time lengths of all of the observed events. They range between a few minutes and 1.75 hours.

The height on the IRIS raster slit of the observed events. They range from about 10 arcsec high to about 160 arcsec high.

The number of boxes per observation against the date. The size of the bubble corresponds to the average length of an event during that observation. (The smallest bubble represents fewer than 10 minutes and the largest bubble represents over an hour.)

The physical size of events is represented by the height on the slit. There is no correlation between larger events and longer events.

The location of the centers of all of our observations on the disc of the sun. The disc is represented by a yellow circle. The size of the dot corresponds to the average time length of an event during that observation, where the smallest is a few minutes and the largest is over an hour. The color of the dot corresponds to the size of the event as measured by its height on the slit of the image, where green corresponds to a smaller event and blue-green corresponds to a larger event. Five of these events occurred off of the limb of the sun, and we are going to continue by making a movie to determine whether the off-limb events are worth studying.

To calculate chi squared, we take the difference between the red line and the double of the blue line and square it. (The green line, a representation of the difference between the curves in this image, is usually about halved.)

After calculating chi squared, we plot it. Then we set a baseline for the curve, which is the mean of the chi squared curve times alpha, a chosen scalar, and determine if the event has an interesting amount of broadening as determined by its maximum being greater than the baseline.

Interesting events as determined by the code for this observation were 1, 9, 10, and 11. 10 has some strong absorption features that we will proceed to analyze over the coming weeks.

A redshifted set of 1400A spectral lines. There is flattening on the 1403A line.

This line set has flattening on the 1403A line.

This 1394 line has a dip in the top and the 1403 line looks like it may be too broad to fit one Gaussian.

Doppler shift along the raster slit at all times in the event.
Movie of this event.

Deviation between 1394A and 1403A Si IV lines at all slit positions and times during a selected event.

Spectrum of 1394A (red) and 1403A (blue) Si IV lines at maximum line difference (whitest pixel in previous image).

The dopper shift map of the raster slit over time.
Movie of this event.

Map of the deviation between the 1394A and the 1403A Si IV lines.

Spectrum of 1394A spectral line (red) and 1403A spectral line (blue) at the maximum line difference (whitest pixel on previous map).