Solar Flare

Donated on 2/28/1989

Each class attribute counts the number of solar flares of a certain class that occur in a 24 hour period

Dataset Characteristics

Multivariate

Subject Area

Physics and Chemistry

Associated Tasks

Regression

Feature Type

Categorical

# Instances

1389

# Features

10

Dataset Information

Additional Information

Notes: -- The database contains 3 potential classes, one for the number of times a certain type of solar flare occured in a 24 hour period. -- Each instance represents captured features for 1 active region on the sun. -- The data are divided into two sections. The second section (flare.data2) has had much more error correction applied to the it, and has consequently been treated as more reliable.

Has Missing Values?

No

Variables Table

Variable NameRoleTypeDemographicDescriptionUnitsMissing Values
modified Zurich classFeatureCategoricalA,B,C,D,E,F,Hno
largest spot sizeFeatureCategoricalX,R,S,A,H,Kno
spot distributionFeatureCategoricalX,O,I,Cno
activityFeatureInteger1 = reduced, 2 = unchangedno
evolutionFeatureInteger1 = decay, 2 = no growth, 3 = growthno
previous 24 hour flare activityFeatureInteger1 = nothing as big as an M1, 2 = one M1, 3 = more activity than one M1no
historically-complexFeatureInteger1 = Yes, 2 = Nono
became complex on this passFeatureInteger. Did region become historically complex on this pass across the sun's disk (1 = yes, 2 = no)no
areaFeatureInteger1 = small, 2 = largeno
area of largest spotFeatureInteger1 = <=5, 2 = >5no

0 to 10 of 13

Additional Variable Information

1. Code for class (modified Zurich class) (A,B,C,D,E,F,H) 2. Code for largest spot size (X,R,S,A,H,K) 3. Code for spot distribution (X,O,I,C) 4. Activity (1 = reduced, 2 = unchanged) 5. Evolution (1 = decay, 2 = no growth, 3 = growth) 6. Previous 24 hour flare activity code (1 = nothing as big as an M1, 2 = one M1, 3 = more activity than one M1) 7. Historically-complex (1 = Yes, 2 = No) 8. Did region become historically complex on this pass across the sun's disk (1 = yes, 2 = no) 9. Area (1 = small, 2 = large) 10. Area of the largest spot (1 = <=5, 2 = >5) From all these predictors three classes of flares are predicted, which are represented in the last three columns. 11. C-class flares production by this region in the following 24 hours (common flares); Number 12. M-class flares production by this region in the following 24 hours (moderate flares); Number 13. X-class flares production by this region in the following 24 hours (severe flares); Number

Reviews

There are no reviews for this dataset yet.

Login to Write a Review
Download
0 citations
29274 views

License

By using the UCI Machine Learning Repository, you acknowledge and accept the cookies and privacy practices used by the UCI Machine Learning Repository.

Read Policy