Solar activity indices vary over the Sun's disk, and various activity parameters are not
considered to be symmetric between the northern and southern hemispheres of the Sun …

Among many other measurable quantities, the summer of 2009 saw a considerable low in
the radiative output of the Sun that was temporally coincident with the largest cosmic-ray flux …

We have studied the 27-day variations and their harmonics in Galactic cosmic ray (GCR)
intensity, solar wind velocity, and interplanetary magnetic field (IMF) components during the …

Cosmogenic isotope records indicate that a solar-cycle modulation persists through
extended periods of very low sunspot activity. One immediate implication is that the …

We used daily full-disk Ca ii 854.2 nm magnetograms from the Synoptic Optical Long Term
Investigations of the Sun (SOLIS) facility to study the chromospheric magnetic field from …

We investigate the characteristics and solar origins of a subpopulation of the solar wind that
possesses extreme values of proton flux. Ulysses observations including solar wind …

The Sun varies in time over at least twenty orders of magnitude. In this highly selective look
at a vast subject, the focus is on solar variations related to the magnetic field structure of the …

Solar cycle 23 behaved differently than cycle 22 in many ways. Certain properties, namely
the long minimum at the end of cycle 23, weakening of polar fields, shrinking of polar …

Interplanetary scintillation (IPS) observations made with the 327-MHz multi-station system of
the Solar-Terrestrial Environment Laboratory (STEL) of Nagoya University are used to …

Chromospheric flares have been carefully observed and studied for many decades. Ribbons
of hot plasma appear, brighten, and separate during the course of a flare. Adjacent to …