This review describes observations of the polar magnetic fields, models for the cyclical
formation and decay of these fields, and evidence of their great influence in the solar …

Based on the variations of sunspot numbers, we choose a 1-year interval at each solar
minimum from the beginning of the acquisition of solar wind measurements in the ecliptic …

Context. Precise localization and characterization of active regions (AR) and coronal holes
(CH) as observed by extreme ultra violet (EUV) imagers are crucial for a wide range of solar …

The Sun's polar fields are currently∼ 40% weaker than they were during the previous three
sunspot minima. This weakening has been accompanied by a corresponding decrease in …

Throughout months of extremely low solar activity during the recent extended solar-cycle
minimum, structural evolution continued to be observed from the Sun through the solar wind …

In an effort to understand the three-dimensional structure of the solar corona and inner
heliosphere during the Whole Heliosphere Interval (WHI), we have developed a global …

We study the occurrence of magnetic storms in space age (1957–2021) using Dst and Dxt
indices. We find 2,526/2,743 magnetic storms in the Dxt/Dst index, out of which 45% are …

We analyze coronal holes present on the Sun during the extended minimum between
Cycles 23 and 24, study their evolution, examine the consequences for the solar wind speed …

The solar cycle 23 minimum period has been characterized by a weaker solar and
interplanetary magnetic field. This provides an ideal time to study how the strength of the …

We analyze the relationship between the coronal hole (CH) characteristics on the Sun (area,
position, and intensity levels) and the corresponding solar wind parameters (solar wind …