# The behavior of the spotless active regions during the solar minimum 23-24

## TL;DR

This study examines the physical properties of spotless active regions during the solar minimum 23-24, revealing they share characteristics with typical active regions, including longevity and flare activity, based on radio and magnetogram data.

## Contribution

It provides new insights into the behavior and characteristics of spotless active regions during solar minimum using radio and magnetogram observations.

## Key findings

- Spotless active regions have similar radio characteristics to ordinary active regions.
- They can persist on the solar surface for over 10 days.
- They are capable of producing small flares.

## Abstract

In this work, we analysed the physical parameters of the spotless actives regions observed during solar minimum 23 - 24 (2007 - 2010). The study was based on radio maps at 17~GHz obtained by the Nobeyama Radioheliograph (NoRH) and magnetograms provided by the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO). The results shows that the spotless active regions presents the same radio characteristics of a ordinary one, they can live in the solar surface for long periods (>10 days), and also can present small flares.