What additional classification are given with solar flares?

In the list of solar events, which is updated by the Space Environment Center every 30 minutes, x-ray flares are not only given with their classes A, B, C, M and X. I addition to the information about the x-ray flux also some information is given on the brightness of the flare in the H-alpha light.
The H-alpha line is an emission line of the neutral hydrogen atom, which falls in the visible part of the electromagnetic spectrum. Its wavelength is measured as 656.3 nm.
The scale of this classification is based on the size optically active region.
Its range is from 0 to 4 and gives a ranking of the importance of an event. The numbers stand for the following region sizes:

• class 0 or Sf - subflare : < = 2.0 square-degree of the solar disc
• class 1 : 2.1-5.1 square-degree of the solar disc
• class 2 : 5.2-12.4 square-degree of the solar disc
• class 3 : 12.5-24.7 square-degree of the solar disc
• class 4 : > = 24.8 square-degree of the solar disc

As additional characterisation one of the three letters F, N or B is added to give the actual brightness of the flare. The letters stand for the following classes:

• class F :faint, a weak and poorly visible event
• class N :normal, an average event
• class B :brilliant, a bright and notable event

To give an example of such a flare classification, the X5/3B-Flare of 2000 July 14th should be explained. This Bastille event led to the huge coronal mass ejection which was responsible for the big auroral storm during the night of 2000 July 15-16. With the classification 3B it was a very bright and big optical flare.