Open AccessHeliolatitude regularities of magnetically disturbed days with daily average geomagnetic index Dst<–100 nT
Author(s) -
Георгий Макаров,
G. A. Makarov
Publication year - 2018
Publication title -
solar-terrestrial physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2500-0535
DOI - 10.12737/stp-43201803
Subject(s) - earth's magnetic field , geomagnetic storm , storm , atmospheric sciences , environmental science , maxima , climatology , meteorology , physics , geology , magnetic field , history , quantum mechanics , performance art , art history
This paper considers storm days for a period 1966–2015 when the daily average geomagnetic Dst index was <–100 nT. The distribution of the number of days with a high daily average Dst is shown to depend on Earth’s heliolatitude φ: the number of days increases with the absolute value of φ in both solar hemispheres. It is found, as expected, that the seasonal distribution of storm days with Dst<–100 nT has equinoctial maxima. Moreover, there is a noticeable increase in the number of such days in July and November. It is noted that at Earth’s heliolatitudes 4.1°–5.0° there is a sharp increase in the number of storm days. It is established that this increase occurs during storm events in July and November, which stand out against the seasonal distribution of highly disturbed days.