Sunspot Bright Points
Debi Prasad Choudhary, Toshifumi Shimizu

TL;DR
This study analyzes the properties and distribution of bright points in sunspots using high-resolution solar observations, revealing their size, temperature, and dynamic behavior, and proposing a model for their brightness variations.
Contribution
It provides detailed classification, temperature measurements, and flux analysis of sunspot bright points, enhancing understanding of their physical characteristics and spatial distribution.
Findings
Most bright points are smaller than 150 km.
Bright points are mainly located around the penumbral boundary.
Brightness enhancements last for 15 to 60 minutes.
Abstract
We used the flux calibrated images through the Broad Band Filter Imager and Stokes Polarimeter data obtained with the Solar Optical Telescope onboard the Hinode spacecraft to study the properties of bright points in and around the sunspots. The well isolated bright points were selected and classified as umbral dot, peripheral umbral dot, penumbral grains and G-band bright point depending on their location. Most of the bright points are smaller than about 150 km. The larger points are mostly associated with the penumbral features. The bright points are not uniformly distributed over the umbra but preferentially located around the penumbral boundary and in the fast decaying parts of umbra. The color temperature of the bright points, derived using the continuum irradiance, are in the range of 4600 K to 6600 K with cooler ones located in the umbra. The temperature increases as a function of…
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