Newly Calibarated Archive Information and data from Kodaikanal Solar Observatory (KoSO).

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Information

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Scripts

1. position_n.pro: To calculate the pole angle ($\theta$) for a given time of observation.
2. timestamp.pro: position_n.pro internally depends on this function to get time stamp string.
3. hour_angle.pro: position_n.pro use this function to calculate Hour Angle of the sun if approx keyword is set.

Data

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Corrected Time of Observation File

This file (CSV: Download Here; TXT: Download Here) contains following information

• Col 1: Filename as stored in KoSO archive, It may varies from one version to another.
• Col 2: Corrected Time of observation (Tobs)
• Col 3: Flag, specifying the correctness of Tobs (Correct 0; Incorrect 1; Unknown -1; Bad 2). Here, Bad implies that the data quality is too bad and our algorithm has failed to get the Tobs.
• Col 4: Pole angle calculated using the Equation 1 and 2 of the article.

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Butterfly Diagram

Will be updated soon

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Latitudinal Distribution of Plage and Sunspot File

These files (Plage: Download Here; Sunspot: Download Here))

• Col 1: Year of observation over which data is used to calculate latitudinal extent.
• Col 2: First Quartile ($Q1$), representing latitude below which 25% plage/sunspot area is covered.
• Col 3: Second Quartile ($Q2$), representing the median latitude of plage/sunspot area distribution for given year.
• Col 4: Thirdt Quartile ($Q3$), representing latitude below which 75% or latitude above which 25% plage/sunspot area is covered.

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Plots