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  1. Article

    Open Access

    Recalibration of the Sunspot-Number: Status Report

    We report progress on the ongoing recalibration of the Wolf sunspot number ( S N ...

    F. Clette, L. Lefèvre, T. Chatzistergos, H. Hayakawa, V. M. S. Carrasco… in Solar Physics (2023)

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  2. Article

    Preface to Topical Issue: Recalibration of the Sunspot Number

    This topical issue contains articles on the effort to recalibrate the sunspot number (SN) that was initiated by the Sunspot Number Workshops. These workshops led to a revision of the Wolf sunspot number (WSN) ...

    F. Clette, E. W. Cliver, L. Lefèvre, L. Svalgaard, J. M. Vaquero… in Solar Physics (2016)

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  3. No Access

    Article

    A Revised Collection of Sunspot Group Numbers

    We describe a revised collection of the number of sunspot groups from 1610 to the present. This new collection is based on the work of Hoyt and Schatten (Solar Phys. 179, 189, 1998). The main changes are the elim...

    J. M. Vaquero, L. Svalgaard, V. M. S. Carrasco, F. Clette, L. Lefèvre… in Solar Physics (2016)

  4. Article

    Open Access

    Introduction to the special issue on history development of solar terrestrial sciences including auroral sub-storms

    Solar terrestrial (ST) sciences started centuries ago and branched into different disciplines. Starting with naked eye to highly sophisticated novel experimental techniques, observations have revealed the secr...

    N. Balan, G. Parks, L. Svalgaard, Y. Kamide, T. Lui in Geoscience Letters (2016)

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  5. No Access

    Article

    A Multi-Observatory Inter-Comparison of Line-of-Sight Synoptic Solar Magnetograms

    The observed photospheric magnetic field is a crucial parameter for understanding a range of fundamental solar and heliospheric phenomena. Synoptic maps, in particular, which are derived from the observed line...

    P. Riley, M. Ben-Nun, J. A. Linker, Z. Mikic, L. Svalgaard, J. Harvey… in Solar Physics (2014)

  6. No Access

    Article

    The 1859 Solar–Terrestrial Disturbance And the Current Limits of Extreme Space Weather Activity

    It is generally appreciated that the September 1859 solar–terrestrial disturbance, the first recognized space weather event, was exceptionally large. How large and how exceptional? To answer these questions, w...

    E. W. Cliver, L. Svalgaard in Solar Physics (2004)

  7. No Access

    Chapter

    Solar Wind and Interplanetary Medium

    Due to high temperature and more importantly a small temperature gradient with height the solar corona is not in hydrostatic equilibrium but is continuously expanding into interplanetary space. The resulting o...

    L. Svalgaard in Illustrated Glossary for Solar and Solar-Terrestrial Physics (1977)