YENRA — SDO IMAGE COMPARISON LOG
Guide: https://yenra.com/wiki/Solar_Dynamics_Observatory/
Version: September 10, 2026

Open in a text editor and save one copy per comparison.
Use the time embedded in each image, not the download time.
The exercise uses online images and requires no direct solar viewing.
Data: https://sdo.gsfc.nasa.gov/data/
Channel definitions: https://sdo.gsfc.nasa.gov/data/channels.php

CHOOSE A QUESTION
Question to explore:
Selected region relative to solar disk center:

RECORD EACH IMAGE
Image 1 product / wavelength / resolution:
Image 1 timestamp and time standard:
Image 1 source URL:
Image 1 direct observation:

Image 2 product / wavelength / resolution:
Image 2 timestamp and time standard:
Image 2 source URL:
Image 2 direct observation:

Image 3 product / wavelength / resolution:
Image 3 timestamp and time standard:
Image 3 source URL:
Image 3 direct observation:

COMPARE
Time offsets between images:
Consistent field, orientation and scale?
Continuum, magnetogram, Dopplergram or AIA wavelength?
Display color and brightness scaling:
Any model overlay (such as PFSS)?
Possible data gap, delay or processing artifact:

MOVIE CHECK
Channel and source URL:
First and last frame timestamps:
Actual time between selected frames:
Directly observed change:
Possible rotation, projection or display contribution:

INTERPRET
Interpretation supported by the observations:
Alternative explanation:
Additional measurement needed:

EARTH-IMPACT CONTEXT, IF RELEVANT
https://www.spaceweather.gov/products/3-day-forecast
Forecast issue time:
Forecast valid period:
Category: geomagnetic / radiation / radio blackout:
Forecast statement and its uncertainty:
Keep the forecast separate from your image interpretation.

UNIT CHECK
10 angstroms = 1 nanometer; 171 angstroms = 17.1 nanometers.
A displayed EUV image color is assigned, not natural visible color.