Physical meaning of the equinoctial effect for semi-annual variation in geomagnetic activity

Yoshida, A.

doi:10.5194/angeo-27-1909-2009

Articles | Volume 27, issue 5

https://doi.org/10.5194/angeo-27-1909-2009

© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/angeo-27-1909-2009

© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 27, issue 5

04 May 2009

| 04 May 2009

Physical meaning of the equinoctial effect for semi-annual variation in geomagnetic activity

A. Yoshida

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Total article views: 2,195 (including HTML, PDF, and XML)

HTML	PDF	XML	Total	BibTeX	EndNote
1,065	1,042	88	2,195	115	156

HTML: 1,065
PDF: 1,042
XML: 88
Total: 2,195
BibTeX: 115
EndNote: 156

Views and downloads (calculated since 01 Feb 2013)

Month	HTML	PDF	XML	Total
Feb 2013	2	13	0	15
Mar 2013	2	23	0	25
Apr 2013	2	9	1	12
May 2013	17	1	18
Jun 2013	6	18	0	24
Jul 2013	1	19	0	20
Aug 2013	10	18	2	30
Sep 2013	3	19	0	22
Oct 2013	4	19	0	23
Nov 2013	18	0	18
Dec 2013	4	11	2	17
Jan 2014	3	11	1	15
Feb 2014	5	13	2	20
Mar 2014	10	7	1	18
Apr 2014	10	0	10
May 2014	2	9	0	11
Jun 2014	1	13	0	14
Jul 2014	2	15	0	17
Aug 2014	3	11	0	14
Sep 2014	6	18	0	24
Oct 2014	31	0	31
Nov 2014	3	27	0	30
Dec 2014	1	15	0	16
Jan 2015	8	0	8
Feb 2015	3	1	1	5
Mar 2015	6	6	0	12
Apr 2015	8	0	8
May 2015	7	4	0	11
Jun 2015	22	2	0	24
Jul 2015	14	7	0	21
Aug 2015	5	5	0	10
Sep 2015	3	9	0	12
Oct 2015	8	1	0	9
Nov 2015	11	3	0	14
Dec 2015	3	1	0	4
Jan 2016	12	4	1	17
Feb 2016	8	2	1	11
Mar 2016	7	3	0	10
Apr 2016	5	3	0	8
May 2016	5	3	0	8
Jun 2016	6	4	0	10
Jul 2016	4	3	1	8
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Sep 2016	3	2	0	5
Oct 2016	4	1	0	5
Nov 2016	2	1	0	3
Dec 2016	4	2	0	6
Jan 2017	4	1	0	5
Feb 2017	4	1	2	7
Mar 2017	4	2	0	6
Apr 2017	7	1	0	8
May 2017	9	3	0	12
Jun 2017	9	1	0	10
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Aug 2017	3	3	0	6
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Oct 2017	2	3	0	5
Nov 2017	3	3	0	6
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Jan 2018	4	4	0	8
Feb 2018	4	3	0	7
Mar 2018	49	3	0	52
Apr 2018	4	4	0	8
May 2018	5	3	0	8
Jun 2018	4	4	0	8
Jul 2018	2	1	0	3
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Sep 2018	3	3	0	6
Oct 2018	4	5	0	9
Nov 2018	4	3	0	7
Dec 2018	5	9	0	14
Jan 2019	3	6	0	9
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Mar 2019	3	4	0	7
Apr 2019	6	4	0	10
May 2019	4	5	0	9
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Jul 2019	1	1	0	2
Aug 2019	1	7	0	8
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Oct 2019	1	10	0	11
Nov 2019	3	0	3
Dec 2019	4	5	0	9
Jan 2020	6	5	1	12
Feb 2020	3	6	0	9
Mar 2020	1	4	0	5
Apr 2020	1	3	0	4
May 2020	3	1	0	4
Jun 2020	8	10	1	19
Jul 2020	22	9	8	39
Aug 2020	9	4	3	16
Sep 2020	6	7	0	13
Oct 2020	4	14	0	18
Nov 2020	2	9	0	11
Dec 2020	9	5	0	14
Jan 2021	12	6	0	18
Feb 2021	7	2	0	9
Mar 2021	4	5	0	9
Apr 2021	3	4	0	7
May 2021	2	6	0	8
Jun 2021	3	3	1	7
Jul 2021	3	1	0	4
Aug 2021	6	4	0	10
Sep 2021	8	4	0	12
Oct 2021	4	21	0	25
Nov 2021	3	7	0	10
Dec 2021	8	2	0	10
Jan 2022	7	4	0	11
Feb 2022	5	7	1	13
Mar 2022	5	4	1	10
Apr 2022	4	2	1	7
May 2022	3	2	0	5
Jun 2022	4	5	0	9
Jul 2022	3	1	0	4
Aug 2022	7	2	0	9
Sep 2022	4	4	0	8
Oct 2022	6	1	0	7
Nov 2022	6	8	0	14
Dec 2022	9	4	0	13
Jan 2023	9	3	0	12
Feb 2023	8	3	0	11
Mar 2023	11	5	1	17
Apr 2023	5	5	0	10
May 2023	7	7	2	16
Jun 2023	2	1	0	3
Jul 2023	4	2	1	7
Aug 2023	3	1	4
Sep 2023	8	6	2	16
Oct 2023	6	6	0	12
Nov 2023	1	0	1
Dec 2023	8	0	8
Jan 2024	1	0	1
Feb 2024	8	5	0	13
Mar 2024	5	2	1	8
Apr 2024	9	4	5	18
May 2024	10	6	5	21
Jun 2024	6	5	2	13
Jul 2024	9	4	3	16
Aug 2024	13	4	3	20
Sep 2024	7	5	0	12
Oct 2024	6	3	0	9
Nov 2024	4	6	1	11
Dec 2024	3	8	0	11
Jan 2025	5	6	0	11
Feb 2025	18	14	3	35
Mar 2025	6	4	0	10
Apr 2025	8	16	0	24
May 2025	11	8	3	22
Jun 2025	30	16	0	46
Jul 2025	16	11	1	28
Aug 2025	12	17	2	31
Sep 2025	26	13	1	40
Oct 2025	23	13	3	39
Nov 2025	23	10	0	33
Dec 2025	20	12	3	35
Jan 2026	26	9	4	39
Feb 2026	18	6	3	27
Mar 2026	25	11	2	38
Apr 2026	16	19	1	36
May 2026	17	5	1	23
Jun 2026	8	3	1	12

Cumulative views and downloads (calculated since 01 Feb 2013)

Month	HTML	PDF	XML	Total
Feb 2013	2	13	0	15
Mar 2013	2	23	0	25
Apr 2013	2	9	1	12
May 2013	17	1	18
Jun 2013	6	18	0	24
Jul 2013	1	19	0	20
Aug 2013	10	18	2	30
Sep 2013	3	19	0	22
Oct 2013	4	19	0	23
Nov 2013	18	0	18
Dec 2013	4	11	2	17
Jan 2014	3	11	1	15
Feb 2014	5	13	2	20
Mar 2014	10	7	1	18
Apr 2014	10	0	10
May 2014	2	9	0	11
Jun 2014	1	13	0	14
Jul 2014	2	15	0	17
Aug 2014	3	11	0	14
Sep 2014	6	18	0	24
Oct 2014	31	0	31
Nov 2014	3	27	0	30
Dec 2014	1	15	0	16
Jan 2015	8	0	8
Feb 2015	3	1	1	5
Mar 2015	6	6	0	12
Apr 2015	8	0	8
May 2015	7	4	0	11
Jun 2015	22	2	0	24
Jul 2015	14	7	0	21
Aug 2015	5	5	0	10
Sep 2015	3	9	0	12
Oct 2015	8	1	0	9
Nov 2015	11	3	0	14
Dec 2015	3	1	0	4
Jan 2016	12	4	1	17
Feb 2016	8	2	1	11
Mar 2016	7	3	0	10
Apr 2016	5	3	0	8
May 2016	5	3	0	8
Jun 2016	6	4	0	10
Jul 2016	4	3	1	8
Aug 2016	3	4	0	7
Sep 2016	3	2	0	5
Oct 2016	4	1	0	5
Nov 2016	2	1	0	3
Dec 2016	4	2	0	6
Jan 2017	4	1	0	5
Feb 2017	4	1	2	7
Mar 2017	4	2	0	6
Apr 2017	7	1	0	8
May 2017	9	3	0	12
Jun 2017	9	1	0	10
Jul 2017	9	2	0	11
Aug 2017	3	3	0	6
Sep 2017	4	6	0	10
Oct 2017	2	3	0	5
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Dec 2017	1	3	0	4
Jan 2018	4	4	0	8
Feb 2018	4	3	0	7
Mar 2018	49	3	0	52
Apr 2018	4	4	0	8
May 2018	5	3	0	8
Jun 2018	4	4	0	8
Jul 2018	2	1	0	3
Aug 2018	4	2	0	6
Sep 2018	3	3	0	6
Oct 2018	4	5	0	9
Nov 2018	4	3	0	7
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Jan 2019	3	6	0	9
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Apr 2019	6	4	0	10
May 2019	4	5	0	9
Jun 2019	4	6	0	10
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Oct 2019	1	10	0	11
Nov 2019	3	0	3
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Jan 2020	6	5	1	12
Feb 2020	3	6	0	9
Mar 2020	1	4	0	5
Apr 2020	1	3	0	4
May 2020	3	1	0	4
Jun 2020	8	10	1	19
Jul 2020	22	9	8	39
Aug 2020	9	4	3	16
Sep 2020	6	7	0	13
Oct 2020	4	14	0	18
Nov 2020	2	9	0	11
Dec 2020	9	5	0	14
Jan 2021	12	6	0	18
Feb 2021	7	2	0	9
Mar 2021	4	5	0	9
Apr 2021	3	4	0	7
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Jun 2021	3	3	1	7
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Aug 2021	6	4	0	10
Sep 2021	8	4	0	12
Oct 2021	4	21	0	25
Nov 2021	3	7	0	10
Dec 2021	8	2	0	10
Jan 2022	7	4	0	11
Feb 2022	5	7	1	13
Mar 2022	5	4	1	10
Apr 2022	4	2	1	7
May 2022	3	2	0	5
Jun 2022	4	5	0	9
Jul 2022	3	1	0	4
Aug 2022	7	2	0	9
Sep 2022	4	4	0	8
Oct 2022	6	1	0	7
Nov 2022	6	8	0	14
Dec 2022	9	4	0	13
Jan 2023	9	3	0	12
Feb 2023	8	3	0	11
Mar 2023	11	5	1	17
Apr 2023	5	5	0	10
May 2023	7	7	2	16
Jun 2023	2	1	0	3
Jul 2023	4	2	1	7
Aug 2023	3	1	4
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Oct 2023	6	6	0	12
Nov 2023	1	0	1
Dec 2023	8	0	8
Jan 2024	1	0	1
Feb 2024	8	5	0	13
Mar 2024	5	2	1	8
Apr 2024	9	4	5	18
May 2024	10	6	5	21
Jun 2024	6	5	2	13
Jul 2024	9	4	3	16
Aug 2024	13	4	3	20
Sep 2024	7	5	0	12
Oct 2024	6	3	0	9
Nov 2024	4	6	1	11
Dec 2024	3	8	0	11
Jan 2025	5	6	0	11
Feb 2025	18	14	3	35
Mar 2025	6	4	0	10
Apr 2025	8	16	0	24
May 2025	11	8	3	22
Jun 2025	30	16	0	46
Jul 2025	16	11	1	28
Aug 2025	12	17	2	31
Sep 2025	26	13	1	40
Oct 2025	23	13	3	39
Nov 2025	23	10	0	33
Dec 2025	20	12	3	35
Jan 2026	26	9	4	39
Feb 2026	18	6	3	27
Mar 2026	25	11	2	38
Apr 2026	16	19	1	36
May 2026	17	5	1	23
Jun 2026	8	3	1	12

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Latest update: 24 Jun 2026

Physical meaning of the equinoctial effect for semi-annual variation in geomagnetic activity

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