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The Relation of Sunspots Umbras Velocity to Zurich and McIntosh Classification
Kamila Permata (a*), Dhani Herdiwijaya (a)

Astronomy Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
kamilapermata13[at]gmail.com


Abstract

Sunspots are darker, cooler areas on the surface of the sun and have strong magnetic field. The morphology of the sunspots group is classified into seven types based on the Zurich classification. The Zurich classification was modified and expanded to improve the objectivity of the definition of sunspot classification. The modified classification is called McIntosh classification that has other parameters to classified sunspot such as size, stability, and complexity. Sunspot has proper motion - the result of the interaction between solar rotation, magnetic field, and convection. In this study, we measured the coordinates of 304 sunspots umbra as tracer in the rising phase of the solar cycle 24th to obtain the relation of sunspots umbras velocity to Zurich and McIntosh classification. Coordinates of sunspots were measured using AIA images at a wavelength of 4500 Å from SDO (Solar Dynamic Observatory) with JHelioviewer software. From the measurement, we got that for the penumbral class in McIntosh classification, x class (no penumbra) and r class (incomplete penumbra) has the largest latitudinal and longitudinal velocity. For the sunspot distribution in McIntosh classification, i class (intermediate) and c class (compact) has highest latitudinal and longitudinal velocity.

Keywords: Sunspots; Proper motion of sunspots; Zurich and McIntosh classification

Topic: Earth and Planetary Sciences

Link: https://ifory.id/abstract/ZpkeUButbEK2

Conference: Asian Physics Symposium (APS 2019)

Plain Format | Corresponding Author (Kamila Permata)

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