Sunshine, Sunlight
Moonshine, Moonlight
Earthshine, Earthlight

I may be wrong again but

Earthshine (not direct Sunshine) is illuminating the ISS in
 this daytime pass and the ISS solar Panels are flaring from EarthShine.
 
This ISS pass was August 25, 2015 at 11:01-11:12 A.M. CDT (UT-5)

Mount: Astro-Physics 900GTO
DBK41AU02.AS color cam at prime-focus on a 10'' Newtonian f4.5
SatelliteTracker v2.5.1
Cordless Logitech JoyStick/Controller

ISS approached from my SW
Sun was 56 degrees high above the SE horizon
The ISS maximum elevation was 72 degrees and also in the SE
ISS Departed to the NE

The ISS passed within 17 degrees of the Sun
Same as a New Moon at 3 or 4 percent.

If you can see a New Moon,
 that is EarthShine illuminating the dark side of the Moon

EarthShine illuminates the bottom of ISS in all daylight passes and
 all panels are visible unless on edge.

 I think at least 2 of flares were from EarthShine.
 
Had problems centering ISS in post-processing.
  It was too dim compared to the bright sky.

Then I realized the Sun was also too high to illuminate the bottom of ISS.

It must be EarthShine.
In the few daytime passes I have captured,
 all ISS panels are visible unless on edge.
 Again that must be Earth-shine helping illuminate the ISS panels.

DOY  Date
236 Aug 24
237 Aug 25
238 Aug 26

TLE
0 ISS (ZARYA)
1 25544U 98067A   15236.78651571 +.00009669 +00000-0 +14613-3 0  9995
2 25544 051.6455 101.5148 0001547 096.7956 027.2833 15.55421917958712

Quicksat.exe output
12  0 56     45 343   108 -2.1   0 9  252 252  349 2.4 109  614  72.6

***  2015 Aug  25  Tue morning  *** Times are AM CDT  ***  2014  537

 H  M  S Tim Al Azi C Dir  Mag Dys F  Hgt Shd  Rng  EW Phs  R A   Dec
25544 ISS                        348  -2.0
11  6 28     51 202   333 -1.5   1 8  252 252  318 2.8 136  730  -3.0
11  6 48     64 186   319 -1.1   1 8  252 252  278 3.2 150  816   8.1
11  7  8     73 136 C 272 -0.2   1 8  252 252  263 3.3 162  915  20.8
11  7 28     65  85   223 -0.5   1 8  252 252  277 2.9 158 1025  32.0
11  7 47     52  68   207 -1.1   1 9  252 252  315 2.3 146 1136  39.1

0 ISS (ZARYA)
1 25544U 98067A   15237.74918303  .00010652  00000-0  16010-3 0  9998
2 25544 051.6448 096.7061 0001601 098.4403 019.7587 15.55447994958861

  33.600  88.600  240.   314 Easy St.         2000  6.5 40 F F T T F

***  2015 Aug  25  Tue morning  *** Times are AM CDT  ***  2014  537

 H  M  S Tim Al Azi C Dir  Mag Dys F  Hgt Shd  Rng  EW Phs  R A   Dec
25544 ISS                        348  -2.0
11  6 27     51 202   333 -1.5   0 8  252 252  318 2.8 136  730  -3.0
11  6 47     64 186   318 -1.1   0 8  252 252  278 3.2 150  816   8.0
11  7  7     73 136 C 272 -0.2   0 8  252 252  263 3.3 162  915  20.8
11  7 27     65  85   223 -0.5   0 9  252 252  277 2.9 158 1025  32.0
11  7 47     52  68   207 -1.1   0 9  252 252  315 2.3 146 1136  39.0