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Night-time Sudden Commencements Observed by Champ and Ground-based Magnetometers and Their Relationship to Solar Wind Parameters : Volume 27, Issue 5 (04/05/2009)

By Lühr, H.

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Book Id: WPLBN0004001995
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Night-time Sudden Commencements Observed by Champ and Ground-based Magnetometers and Their Relationship to Solar Wind Parameters : Volume 27, Issue 5 (04/05/2009)  
Author: Lühr, H.
Volume: Vol. 27, Issue 5
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Araki, T., Rother, M., Schlegel, K., Förster, M., & Lühr, H. (2009). Night-time Sudden Commencements Observed by Champ and Ground-based Magnetometers and Their Relationship to Solar Wind Parameters : Volume 27, Issue 5 (04/05/2009). Retrieved from

Description: Helmholtz Centre Potsdam – GFZ, German Research Centre for Geosciences, Potsdam, Germany. We have studied 41 Sudden Commencements (SC) using simultaneous magnetic field data from the CHAMP satellite and ground stations of the years 2000–2007. They are all night time events, since the influence of ionospheric currents on the SC is supposed to be minimal at night. This is confirmed by our study for geomagnetic latitudes below ±40°. We further found that the onset times of the SC signature at satellite altitude and on the ground are the same within an uncertainty of 10 s and that the slopes of the corresponding magnetic field variation are very similar. For magnetic latitudes poleward of ±40° the amplitude of SCs increases both at the satellite and on ground, probably a consequence of field-aligned currents. CHAMP sometimes records small-scale magnetic variations different from the ground, which can be explained by local ionospheric currents. We also studied the relationship between the SC amplitude seen by CHAMP and the corresponding abrupt solar wind dynamic pressure change, using ACE data. Our results are compared with earlier studies using ground-based data and with theoretical expectations. It turns out that the induction effect in the Earth is quite small at low latitudes. Another important result is that the magnetic signature near the Earth is over-proportionally reduced for weak SC events. A discussion of accuracy and the uncertainty of our results completes the paper.

Night-time sudden commencements observed by CHAMP and ground-based magnetometers and their relationship to solar wind parameters

Araki, T.: Global structure of geomagnetic sudden commencements, Planet. Space Sci., 25, 373–384, 1977.; Araki, T.: A Physical Model of the Geomagnetic Sudden Commencement, in: Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves, edited by: Engebretson, M. J., Takahashi, K., and Scholer, M., AGU Geophys. Monograph 81, p. 183, Washington, D.C., 1994.; Araki, T., Iyemori, T., and Kamei, T.: Sudden commencements observed by MAGSAT above the Ionophere, J. Geomagn. Geoelectr., 36, 507–520, 1984.; Araki, T., Funato, K., Iguchi, T., and Kamei, T.: Direct detection of solar wind dynamic pressure effect on ground geomagnetic field, Geophys. Res. Lett., 20, 775–778, 1993.; Araki, T., Takeuchi, T., and Araki, Y.: Rise time of geomagnetic sudden commencements – Statistical analysis of ground geomagnetic data, Earth Planet. Space, 56, 289–293, 2004.; Araki, T., Keika, K., Kamei, T., Yang, H., and Alex, S.: Night-time enhancement of the amplitude of geomagnetic sudden commencements and its dependence on IMF-Bz, Earth Planets Space, 58, 45–50, 2006.; Cahill, L. J., Waite, N. G., Engebretson, M. J., and Sugiura, M.: Toroidal standing waves excited by a storm sudden commencement: DE1 observations, J. Geophys. Res., $95$, 7857–7867, 1990.; Engebretson, M. J., Murr, D. L., Hughes, W. J., Lühr, H., Moretto, T., Posch, J. L., Weatherwax, A. T., Rosenberg, T. J., Maclennan, C. G., Lanzerotti, L. J., Marcucci, F., Dennis, S., Burns, G., Bitterly, J., and Bitterly, M.: A multipoint determination of the propagation velocity of a sudden commencement across the polar ionosphere, J. Geophys. Res., 104, 22433–22451, 1999.; Fowler, G. J. and Russell, C. T.: Geomagnetic field response along the polar orbit to rapid changes in the solar wind dynamic pressure, J. Geophys. Res., 106, 18943–18956, 2001.; Reigber, Ch., Lühr, H., and Schwintzer, P.: CHAMP Mission Status, Adv. Space Res., 30(2), 129–134, 2002.; Haaland, S., Paschmann, G., and Sonnerup, B. U. Ö.: Comment on A new interpretation of Weimer et al.'s solar wind propagation delay technique by Bargatze et al., J. Geophys. Res., 111, A06102, doi:10.1029JA011376, 2006.; Haaland, S. E., Paschmann, G., Förster, M., Quinn, J. M., Torbert, R. B., McIlwain, C. E., Vaith, H., Puhl-Quinn, P. A., and Kletzing, C. A.: High-latitude plasma convection from Cluster EDI measurements: method and IMF-dependence, Ann. Geophys., 25, 239–253, 2007.; Han, De-Sheng, Araki, T., Yang, H.-G., Chen, Z.-T., Iyemori, T., and Stauning, P.: Comparative study of geomagnetic sudden commencements (SC) between Oersted and ground observations at different local times, J. Geophys. Res., 112, A05226, doi:10.1029/2006JA011953, 2007.; Kikuchi, T. and Araki, T.: Preliminary positive impulse of geomagnetic sudden commencement observed at dayside middle and low latitudes, J. Geophys. Res., 90, 12195–12200, 1985.; Kikuchi, T., Tsunomura, S., Hashimoto, K., and Nozaki, K.: Field-aligned current effects on middle latitude geomagnetic sudden commencements, J. Geophys. Res., 106, 15555–15565, 2001.; Kokubun, S.: Characteristics of storm sudden commencement at geostationary orbit, J. Geophys. Res., 88, 10025–10033, 1983.; Lühr, H., Rother, M., Maus, S., Mai, W., and Cooke, D.: The diamagnetic effect of the equatorial Appleton anomaly: Its characteristics and impact on geomagnetic field modelling, Geophys. Res. Lett., 30(17), 1906, doi:10.1029/2003GL017407, 2003.; Maus, S. and Lühr, H.: A gravity-driven electric current in the Earth's ionosphere identified in CHAMP satellite magnetic measurements, Geophys. Res. Lett., 33, L02812, doi:10.1029/2005GL024436, 2006.; Maus, S., Rother, M., Stolle, C., Mai, W., Choi, S.-C., Lühr, H., Cooke, D., and Roth, C.: Third generation of the Potsdam Magnetic Model of the Earth (POMME), Geochem. Geophys. Geosyst., 7, Q07008, doi:10.1029GC001269, 2006.; Patel, V. L.: Sudden impulses in the geomagnetotail and the vicinity, Planet. Space Sci., 20, 1127–1136, 1972.; McComas, D. J., Bame, S. J., Barker, P., Feldm


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