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Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: results from MAGDAS

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Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: results from MAGDAS. / Bolaji, O. S.; Rabiu, Babatunde; Bello, O. R. et al.
In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 5, 05.2015, p. 3883-3898.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Bolaji, OS, Rabiu, B, Bello, OR, Yoshikawa, A, Odeyemi, OO & Ogunmodimu, O 2015, 'Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: results from MAGDAS', Journal of Geophysical Research: Space Physics, vol. 120, no. 5, pp. 3883-3898. https://doi.org/10.1002/2014JA020728

APA

Bolaji, O. S., Rabiu, B., Bello, O. R., Yoshikawa, A., Odeyemi, O. O., & Ogunmodimu, O. (2015). Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: results from MAGDAS. Journal of Geophysical Research: Space Physics, 120(5), 3883-3898. https://doi.org/10.1002/2014JA020728

Vancouver

Bolaji OS, Rabiu B, Bello OR, Yoshikawa A, Odeyemi OO, Ogunmodimu O. Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: results from MAGDAS. Journal of Geophysical Research: Space Physics. 2015 May;120(5):3883-3898. Epub 2015 Mar 26. doi: 10.1002/2014JA020728

Author

Bolaji, O. S. ; Rabiu, Babatunde ; Bello, O. R. et al. / Spatial variability of solar quiet fields along 96° magnetic meridian in Africa : results from MAGDAS. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 5. pp. 3883-3898.

Bibtex

@article{2429708194894c689726672245e579f9,
title = "Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: results from MAGDAS",
abstract = "We have used chains of Magnetic Data Acquisition System (MAGDAS) magnetometer records of the horizontal (H) and vertical (Z) magnetic field intensities during September 2008 to August 2009 (year of deep minimum) across Africa to study their variability during the quietest international days, which coincidently associated with the sudden stratospheric warming (SSW) event in January 2009. This selection of the most international quiet days is indicative of 80% that are strongly associated with days when unusually strong and prolonged sudden SSW event occurs in January 2009. Interestingly, in January, a significant magnitude depletion of solar quiet (Sq) equivalent current was observed near noon hours around the magnetic equator (Addis Ababa, ABB) compared to any other months along with a consistent significantly reduced value across the Northern Hemisphere and moderate decrease at the Southern Hemisphere. Also, we found that Nairobi and Dar es Salaam at the Southern Hemisphere, which are close to ABB (dip equator), are strongly prone to westward electric field compared to the magnetic equator and Khartoum at the Northern Hemisphere. Significant negative values of MSq(Z) magnitudes observed near noon hours at Hermanus indicate the presence of induced currents that suggest ocean effects along with reversal to significant positive values in the afternoon, which subsided before 1800 LT in almost all the months, indicate stronger influence of ionospheric currents. On seasonal variability of Sq(H), a slight depression at ABB during September equinox is one of the evidences of seasonal Sq focus shift. Latitudinal variability of Sq near-noon hours was also investigated.",
author = "Bolaji, {O. S.} and Babatunde Rabiu and Bello, {O. R.} and A. Yoshikawa and Odeyemi, {O. O.} and Olugbenga Ogunmodimu",
note = "{\textcopyright} 2015 American Geophysical Union",
year = "2015",
month = may,
doi = "10.1002/2014JA020728",
language = "English",
volume = "120",
pages = "3883--3898",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "5",

}

RIS

TY - JOUR

T1 - Spatial variability of solar quiet fields along 96° magnetic meridian in Africa

T2 - results from MAGDAS

AU - Bolaji, O. S.

AU - Rabiu, Babatunde

AU - Bello, O. R.

AU - Yoshikawa, A.

AU - Odeyemi, O. O.

AU - Ogunmodimu, Olugbenga

N1 - © 2015 American Geophysical Union

PY - 2015/5

Y1 - 2015/5

N2 - We have used chains of Magnetic Data Acquisition System (MAGDAS) magnetometer records of the horizontal (H) and vertical (Z) magnetic field intensities during September 2008 to August 2009 (year of deep minimum) across Africa to study their variability during the quietest international days, which coincidently associated with the sudden stratospheric warming (SSW) event in January 2009. This selection of the most international quiet days is indicative of 80% that are strongly associated with days when unusually strong and prolonged sudden SSW event occurs in January 2009. Interestingly, in January, a significant magnitude depletion of solar quiet (Sq) equivalent current was observed near noon hours around the magnetic equator (Addis Ababa, ABB) compared to any other months along with a consistent significantly reduced value across the Northern Hemisphere and moderate decrease at the Southern Hemisphere. Also, we found that Nairobi and Dar es Salaam at the Southern Hemisphere, which are close to ABB (dip equator), are strongly prone to westward electric field compared to the magnetic equator and Khartoum at the Northern Hemisphere. Significant negative values of MSq(Z) magnitudes observed near noon hours at Hermanus indicate the presence of induced currents that suggest ocean effects along with reversal to significant positive values in the afternoon, which subsided before 1800 LT in almost all the months, indicate stronger influence of ionospheric currents. On seasonal variability of Sq(H), a slight depression at ABB during September equinox is one of the evidences of seasonal Sq focus shift. Latitudinal variability of Sq near-noon hours was also investigated.

AB - We have used chains of Magnetic Data Acquisition System (MAGDAS) magnetometer records of the horizontal (H) and vertical (Z) magnetic field intensities during September 2008 to August 2009 (year of deep minimum) across Africa to study their variability during the quietest international days, which coincidently associated with the sudden stratospheric warming (SSW) event in January 2009. This selection of the most international quiet days is indicative of 80% that are strongly associated with days when unusually strong and prolonged sudden SSW event occurs in January 2009. Interestingly, in January, a significant magnitude depletion of solar quiet (Sq) equivalent current was observed near noon hours around the magnetic equator (Addis Ababa, ABB) compared to any other months along with a consistent significantly reduced value across the Northern Hemisphere and moderate decrease at the Southern Hemisphere. Also, we found that Nairobi and Dar es Salaam at the Southern Hemisphere, which are close to ABB (dip equator), are strongly prone to westward electric field compared to the magnetic equator and Khartoum at the Northern Hemisphere. Significant negative values of MSq(Z) magnitudes observed near noon hours at Hermanus indicate the presence of induced currents that suggest ocean effects along with reversal to significant positive values in the afternoon, which subsided before 1800 LT in almost all the months, indicate stronger influence of ionospheric currents. On seasonal variability of Sq(H), a slight depression at ABB during September equinox is one of the evidences of seasonal Sq focus shift. Latitudinal variability of Sq near-noon hours was also investigated.

U2 - 10.1002/2014JA020728

DO - 10.1002/2014JA020728

M3 - Journal article

VL - 120

SP - 3883

EP - 3898

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 5

ER -