IP Library › Granted Patent US 12,320,949
Granted Patent B2
US 12,320,949 · App. 17/735,729 · Granted Jun 3, 2025

Advanced warning for solar flares from photosphere image analysis

Inventors: Robert Allen Makin, III (Kalamazoo, MI); Steven Michael Durbin (Kalamazoo, MI)
Assignee: Board of Trustees of Western Michigan University
G01W1/10G06V10/25G06V10/507G06V20/46
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Quick Facts
Patent No.
US 12,320,949
App. No.
17/735,729
Granted
Jun 3, 2025
Kind
B2
Abstract

A method for quantifying disorder and extracting a corresponding numerical value of an order parameter from contrast analysis applied to optical images acquired of the solar photosphere. Temporal variation of the order parameter may be utilized to predict events such as solar flares, which have the ability to disrupt both communication systems and satellite orbits. The degree of order of the photosphere may be monitored to predict solar flares and other solar events. The method may utilize a spin-based (Ising/Potts) model of disorder.

Claims (64)

1. A method of protecting solar-weather vulnerable devices and systems by predicting disruptive solar events, the method comprising:

repeatedly extracting numerical values corresponding to an order parameter, wherein said order parameter is S or S 2 , from a plurality of sets of solar atmosphere data measured over time, wherein the plurality of sets of solar atmosphere data comprise images of the Sun, and the numerical values corresponding to order parameter are extracted from a series of images of the Sun, wherein

at least some of the images of the Sun include bright regions and dark regions and wherein:

extracting the numerical values corresponding to order parameter comprises thresholding the images of the Sun to determine an area of the bright regions,

selecting regions of interest of the images of the Sun, and

determining a squared order parameter value (S 2 ) by calculating a ratio of the area of the bright regions to a total area of the regions of interest of each image of the Sun; and

predicting a solar event if a change in the extracted numerical values satisfies prediction criteria, wherein the prediction criteria comprise a predefined increase in numerical values corresponding to the order parameter over a pre-defined interval of time.

2. The method of claim 1 , wherein:

thresholding the images of the Sun includes converting the images to greyscale images;

calculating a pixel intensity histogram for each of the greyscale images;

fitting the pixel intensity histogram with first and second curves that sum to an overall curve fit of the pixel intensity histogram, wherein the first and second curves represent pixel intensity distributions from disordered and ordered regions, respectively, and wherein a higher one of the first and second curves has a peak that is higher than the other of the first and second curves;

determining an intersection of the first and second curves;

determining a distance comprising a number of standard deviations that the intersection is away from the highest peak among the first and second curves;

setting a threshold to the highest center point value of said highest peak among the first and second curves less the lowest first or second curve value within that number of standard deviations;

performing a binary threshold on each greyscale image to form a binary image; and

calculating an order parameter squared (S 2 ) value for each greyscale image by counting the number of bright pixels in the binary image and dividing the number of bright pixels in the binary image by the total number of pixels contained in each greyscale image.

3. The method of claim 2 , wherein

thresholding the images of the Sun further includes

selecting a region of interest prior to calculating a pixel intensity histogram; and wherein:

the pixel intensity histogram is calculated for the region of interest; and

the S 2 value is calculated for the region of interest.

4. The method of claim 1 , wherein:

the predefined increase in numerical values corresponding to order parameter comprises an increase of at least 5% over a period of 30 minutes or less.

5. The method of claim 1 , wherein:

the predefined increase in numerical values corresponding to order parameter comprises an increase of at least 0.04.

6. The method of claim 1 , including:

fitting a curve to the S 2 values, wherein the curve comprises S 2 values over time; and wherein:

the prediction criteria comprises a slope in the curve that meets or exceeds a predefined slope.

7. The method of claim 1 , wherein:

the solar atmosphere data comprise frames from a solar photosphere movie.

8. The method of claim 1 , wherein:

the solar atmosphere data comprise frames from a movie comprising a sequence of images of a specific layer of the solar atmosphere.

9. The method of claim 1 , including:

utilizing a computer to repeatedly extract numerical values corresponding to an order parameter from a plurality of sets of solar atmosphere data measured over time;

utilizing a computer to predict a solar event if a change in the extracted numerical values satisfies prediction criteria.

10. The method of claim 1 , further comprising

providing a protective directive if a solar event is predicted.

11. The method of claim 10 , wherein

the protective directive is provided at least one hour prior to the predicted solar event.

12. The method of claim 10 , further comprising

protecting a solar-weather vulnerable device or system from disruption upon receipt of the protective directive.

13. The method of claim 1 , wherein the solar event is a solar flare or a CME.

14. A computer-implemented method of protecting solar-weather vulnerable devices and systems by predicting disruptive solar events, the method comprising:

utilizing a computer to repeatedly extract numerical values corresponding to an order parameter from sets of digital solar atmosphere data measured over time, wherein the sets of solar atmosphere data comprise digital images of the Sun, and the numerical values corresponding to order parameter are extracted from a series of digital images of the Sun utilizing a computer, and wherein at least some of the digital images of the Sun include bright regions and dark regions, and

extracting the numerical values corresponding to order parameter comprises utilizing a computer to threshold the digital images of the Sun to determine an area of the bright regions,

selecting regions of interest of the digital images of the Sun, and

utilizing a computer to determine a squared order parameter value (S 2 ) by calculating, using a computer, a ratio of the area of the bright regions to a total area of the regions of interest of each digital image of the Sun; and

utilizing a computer to predict a solar event if a change in the extracted numerical values satisfies prediction criteria, wherein the prediction criteria comprise a predefined increase in numerical values corresponding to the order parameter over a predefined interval of time.

15. The method of claim 14 , wherein:

thresholding the digital images of the Sun includes utilizing a computer to convert the digital images to greyscale digital images,

utilizing a computer to calculate a pixel intensity histogram for each of the greyscale images,

utilizing a computer to fit the pixel intensity histogram with first and second curves that sum to an overall curve fit of the pixel intensity histogram, wherein the first and second curves represent pixel intensity distributions from disordered and ordered regions, respectively, and wherein a higher one of the first and second curves has a peak that is higher than the other of the first and second curves,

utilizing a computer to determine an intersection of the first and second curves,

utilizing a computer to determine a distance comprising a number of standard deviations that the intersection is away from the highest peak among the first and second curves,

utilizing a computer to set a threshold to the highest center point value of said highest peak among the first and second curves less the lowest first or second curve value within that number of standard deviations,

utilizing a computer to perform a binary threshold on each greyscale digital image to form a binary digital image; and

calculating an order parameter squared (S 2 ) value for each greyscale digital image by counting the number of bright pixels in the binary digital image and dividing the number of bright pixels by the total number of pixels contained in each greyscale digital image.

16. The method of claim 14 , further comprising

providing a protective directive if a solar event is predicted.

17. The method of claim 16 , further comprising

protecting a solar-weather vulnerable device or system from disruption upon receipt of the protective directive.

18. The method of claim 16 , wherein

the protective directive is provided at least one hour prior to the predicted solar event.

19. The method of claim 14 , wherein the solar event is a solar flare or a CME.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 29, 2022
From: MAKIN, ROBERT ALLEN, III; DURBIN, STEVEN MICHAEL
To: THE BOARD OF TRUSTEES OF WESTERN MICHIGAN UNIVERSITY
Reel/Frame 060928/0051 →
Continuity (3)
Provisional Application 63192709 · May 25, 2021
Provisional Application 63183192 · May 3, 2021
Related Publication 20220365243A1 · Nov 17, 2022
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