Analysis of extrema of quasi-biennial variations of the solar activity

Ivanov–Kholodny, G. S.; Chertoprud, V. E.

doi:10.1080/10556799208230542

Cited by 11 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1). These oscillations may be related to the variations in solar activity (Ivanov-Kholodny and Chertoprud, 1992;IvanovKholodny, 2000), but they are not removed by any regression with R 12 or Ap, and an 11-year running mean smoothing is applied to conquer them (see later).…”

Section: Methods Descriptionmentioning

confidence: 99%

A revised approach to the ƒ<i>o</i>F2 long-term trends analysis

et al. 2002

View full text Add to dashboard Cite

Abstract. A new approach to extract foF2 long-term trends, which are free to a great extent from solar and geomagnetic activity effects, has been proposed. These trends are insensitive to the phase (increasing/decreasing) of geomagnetic activity, with long-term variations being small and insignificant for such relatively short time periods. A small but significant residual foF2 trend, with the slope K r = −2.2 × 10 −4 per year, was obtained over a 55-year period (the longest available) of observations at Slough. Such small trends have no practical importance. On the other hand, negative (although insignificant) residual trends obtained at 10 ionosonde stations for shorter periods (31 years) may be considered as a manifestation of a very long-term geomagnetic activity increase which did take place during the 20th century. All of the revealed foF2 long-term variations (trends) are shown to have a natural origin related to long-term variations in solar and geomagnetic activity. There is no indication of any manmade foF2 trends.

show abstract

Section: Methods Descriptionmentioning

confidence: 99%

A revised approach to the ƒ<i>o</i>F2 long-term trends analysis

et al. 2002

View full text Add to dashboard Cite

show abstract

“…To identify the QBV in GA, we used the methodology proposed in (Ivanov-Kholodny & Chertoprud, 1992) for identifying the QBV in SA, which consists in subtracting the value of the selected parameter for the same month in the previous and next year from the double monthly average value of the selected parameter.…”

Section: Quasi-biennial Variations Of Geomagnetic Activitymentioning

confidence: 99%

Solar and Geomagnetic Activity in 19-25 Cycles

Sumaruk,

Neska

2023

OAP

View full text Add to dashboard Cite

The paper presents the results of the analysis of changes solar and geomagnetic activity in 19−25 Wolf cycles. A forecast of the maximum geomagnetic activity cycle 25 is made. Solar activity is presented by sunspot number RZ, geomagnetic activity is expressed by the energetic index calculated from the data of the "Lviv" and "Belsk" geomagnetic observatories. By annual averages RZ values, the 11-year window was used to obtain the solar activity minimum (around 1711, 1810, 1901, and 2009). The minimum of 2009 was one of the smallest in the observed data, and we took it as the beginning of the 24th cycle and the 100-year solar activity cycle. The maximum of the 24th cycle occurred in 2014 for RZ and in 2015 for energetic index. Cycle 25 began in 2019 according to RZ, and in 2020 cording to energetic index. For cycles 19−25 solar activity is 1−2 years ahead of magnetic activity. The identified quasi-biennial variations over the studied period and the lag of geomagnetic activity from solar activity allow us to predict the magnitude of geomagnetic activity and its maximum in cycle 25. According to our calculations, the maximum of geomagnetic activity will occur around 2026 and its magnitude will be 1.5−2 times higher than the maximum of the 24th cycle.

show abstract

“…The latter characterize short period solar activity variations and correlate well with many geophysical parameters, such as ionospheric and geomagnetic activity, meteorological phenomena, etc. (Kononovich and Shefov, 2003;Ivanov Kholodny and Chertoprud, 1992). Figure 1 (top) shows the GSMF signs.…”

Section: Datamentioning

confidence: 99%

A decrease in solar and geomagnetic activity from cycle 19 to cycle 24

et al. 2015

View full text Add to dashboard Cite

Variations in the solar and geomagnetic activity from cycle 19 to cycle 24 were considered based on data from the magnetic observatories of the Russian-Ukrainian INTERMAGNET segment and interna tional centers of data on solar-terrestrial physics. It has been indicated that activity decreases over the course of time. This is especially evident during the cycle 24 growth phase. The possible causes and consequences of a decrease in geomagnetic activity were analyzed.

show abstract

Analysis of extrema of quasi-biennial variations of the solar activity

Cited by 11 publications

References 6 publications

A revised approach to the ƒ<i>o</i>F2 long-term trends analysis

A revised approach to the ƒ<i>o</i>F2 long-term trends analysis

Solar and Geomagnetic Activity in 19-25 Cycles

A decrease in solar and geomagnetic activity from cycle 19 to cycle 24

Contact Info

Product

Resources

About

Analysis of extrema of quasi-biennial variations of the solar activity

Cited by 11 publications

References 6 publications

A revised approach to the ƒ&lt;i&gt;o&lt;/i&gt;F2 long-term trends analysis

A revised approach to the ƒ&lt;i&gt;o&lt;/i&gt;F2 long-term trends analysis

Solar and Geomagnetic Activity in 19-25 Cycles

A decrease in solar and geomagnetic activity from cycle 19 to cycle 24

Contact Info

Product

Resources

About

A revised approach to the ƒ<i>o</i>F2 long-term trends analysis

A revised approach to the ƒ<i>o</i>F2 long-term trends analysis