228 datasets found

The relative sunspot number (SN) is the primary index of solar activity back to 1610. For earlier periods, SN can be reconstructed from the concentrations of cosmogenic...

Observations of the Fe and O charge states in the solar wind and interplanetary coronal mass ejections (ICMEs) generally exhibit a positive correlation between the average...

One-dimensional, semi-empirical models of the solar atmosphere are widely employed in numerous contexts within solar physics, ranging from the determination of element...

Full-disc observations of the Sun in the H{alpha} line provide information about the solar chromosphere, and in particular, about the filaments, which are dark and elongated...

The radial evolution of the density of the plasma and the magnetic field in the heliosphere, especially in the region between the solar corona and the Earth's orbit, has been a...

Though the solar wind is characterized by spatial and temporal variability across a wide range of scales, long-term averages of in situ measurements have revealed clear radial...

We present a list of 61 solar energetic electron (SEE) events measured by the MESSENGER mission and the radial dependences of some parameters associated with these SEE events....

The SiI 6560.58{AA} line in the H{alpha} blue wing is blended with a telluric absorption line from water vapor in ground-based observations. Recent observations with the...

Long-term fluxes or integral fluences of solar energetic particle (SEP) and their variability within and beyond the 11-year solar cycle makes an important information for Space...

To enable radial velocity (RV) precision on the order of ~0.1m/s required for the detection of Earth-like exoplanets orbiting solar-type stars, the main obstacle lies in...

Previous studies have shown significant North-South asymmetries for various features and indicators of solar activity. These findings suggest some decoupling between the two...

The 11-year solar cycle (Schwabe cycle) is the dominant pattern of solar magnetic activity reflecting the oscillatory dynamo mechanism in the Sun's convection zone. Solar cycles...

Fluences of solar energetic particles (SEPs) are not easy to evaluate, especially for high-energy events (i.e. ground-level enhancements, GLEs). Earlier estimates of...

Continuous measurements of ground-based neutron monitors (NMs) form the main data source to study high-energy/high-intensity solar energetic particle (SEP) events, called...

Studies of long-term solar activity and variability require knowledge of the past evolution of the solar surface magnetism. An important source of such information are the...

Suprathermal electron pitch-angle distributions (PADs) contain substantial information about the magnetic topology of the solar wind. Their characterisation and quantification...

Systematic observations of magnetic field strength and polarity in sunspots began at Mount Wilson Observatory (MWO), USA in early 1917. Except for a few brief interruptions,...

Reconstructions of past irradiance variations require suitable data on solar activity. The longest direct proxy is the sunspot number, and it has been most widely employed for...

The solar meridional flow is an essential ingredient in flux-transport dynamo models. However, no consensus on its subsurface structure has been reached. We merge the data sets...

We design an event recognition-analysis system that can automatically detect solar type III radio burst and can mine information of the burst from the dynamic spectra observed...