Basic information
NuSTAR observation time (orbit 10): 2020-09-12 23:40:00 - 2020-09-13 00:25:00
| Instrument | Wavelength regime | Cadence | Resolution/px |
|---|---|---|---|
| NuSTAR | SXR | 20s | low |
| XRT Be-Thin | SXR | 200s | 1” |
| AIA | EUV | 12 s | 0.6” |
| STEREO-A EUVI | EUV | 5 min | 1.6” |
Flare Location
Flare location determined by finding the position of the center of mass of the 90% contour of the XRT submap around the flare area. To align with AIA, this requires ~25” offset in x and ~25” in y from the location in XRT header (coordinates below given in XRT frame).
<SkyCoord (Helioprojective: obstime=2020-09-13 00:06:25, rsun=695508000.0 m, observer=<HeliographicStonyhurst Coordinate (obstime=2020-09-13 00:06:25): (lon, lat, radius) in (deg, deg, m)
( 0., 7.22821207, 1.50526512e+11)>): (Tx, Ty) in arcsec
(-851.06154174, 162.10228782)>
Flare time evolution (AIA and STEREO)
3-minute integrated AIA 193 images
| Source | Image | Base Difference | Sobel Filter |
|---|---|---|---|
| AIA 193 |  |
 |
 |
| STEREO-A 195 |  |
 |
 |
Lightcurves
AIA and XRT at native cadence, calculated using 40” box.
STEREO-A at native cadence (5 minutes), calculated using 40” box. Larger offset from XRT coordinates required (60” in x, 30” in y) due to closeness to the limb from the Earth-Sun pov.
NuSTAR images at 20s cadence (made by Sam), adjusted to counts, calculated using 160” square box.
Masks
Find regions of brightening/dimming by comparing the change in the flare region vs the quiet Sun region. A pixel is included in ‘brightening’ mask if the value of that pixel in the difference image (integrate flare X-ray peak minus integrated pre-flare) is >5x greater than standard deviation of the average flux difference in Quiet Sun (𝜎_QSdiff) in those same time ranges (details in code below). Likewise with ‘dimming’ mask, only the pixel value is less than -5x 𝜎_QSdiff. The total mask is sum of both masks in each channel.
