Sunspotter Talk

Zurich Sunspot Group Classification vs McIntosh Sunspot Group Classification

  • astronomerj by astronomerj

    I referred to the website http://www.petermeadows.com/html/glossary.html

    In addition to what I posted earlier which only shows the diagram of McIntosh Sunspot Group Classification.

    This discussion mainly focuses on Zurich Sunspot Group Classification.

    Zurich Sunspot Group Classification.

    Sunspot groups are classified into 9 types:-

    A: Unipolar group without penumbra,
    B: Bipolar group without penumbra on any spots,
    C: Bipolar group with penumbra on one end of group, usually surrounding largest of leading umbra,
    D: Bipolar group with penumbrae on spots at both ends of group and with longitudinal extent less than 10°,
    E: Bipolar group with penumbrae on spots at both ends of group and with longitudinal length between 10° and 15°.
    F: Bipolar group with penumbrae on spots at both ends of group and with longitudinal length more than 15°.
    G: As for E or F groups but without any spots between the penumbrae at both ends of the group.
    H: Unipolar group with penumbra with a diameter of at least 2.5°.
    J: Unipolar group with penumbra with a diameter less than 2.5°.

    I hope forum users will find this post beneficial(: Have fun classifying sunspots.

    Posted