Zobrazeno 1 - 10
of 1 053
pro vyhledávání: '"S. Y. Ma"'
Publikováno v:
Annales Geophysicae, Vol 31, Pp 15-30 (2013)
The controls of merging electrical field, Em, and IMF (interplanetary magnetic field) magnitude, B, on the storm-time changes in upper thermospheric mass density are statistically investigated using GRACE accelerometer observations and the OMNI da
Externí odkaz:
https://doaj.org/article/7dd03bae8dc84d6fbe5d036b84e57d51
Publikováno v:
Annales Geophysicae, Vol 30, Pp 1709-1717 (2012)
In this paper, we present further observational evidence for the transpolar propagation of large-scale traveling ionospheric disturbances (LSTIDs) from their nightside source region to the dayside reported by Cai et al. (2011). Slant total electro
Externí odkaz:
https://doaj.org/article/c182098fb54548a88f2b7dcf5ae3809a
Publikováno v:
Annales Geophysicae, Vol 30, Pp 1259-1269 (2012)
In this study five years of CHAMP (Challenging Mini-satellite Payload) fluxgate magnetometer (FGM) data is used to investigate the characteristics of Equatorial Plasma Bubbles (EPBs). We filtered the FGM data by using band-passes with four differe
Externí odkaz:
https://doaj.org/article/322b522e0fad420b828149fa9497d3eb
Publikováno v:
Annales Geophysicae, Vol 29, Pp 1355-1363 (2011)
In this paper, we present observational evidence for the trans-polar propagation of large-scale Traveling Ionospheric Disturbances (TIDs) from their nightside source region to the dayside. On 13 February 2001, the 32 m dish of EISCAT Svalbard Radar
Externí odkaz:
https://doaj.org/article/e4afa9b44f9b46298ab182c949566b2c
Publikováno v:
Annales Geophysicae, Vol 28, Pp 1647-1658 (2010)
Based on the multi-year data base (2001–2009) of CHAMP Planar Langmuir Probe (PLP) data and GRACE K-Band Ranging (KBR1B) data, typical features of ionospheric plasma irregularities are studied at the altitudes of CHAMP (300–400 km) and GRACE (
Externí odkaz:
https://doaj.org/article/55418c01bcc848d8b2945fd9106d64ff
Publikováno v:
Annales Geophysicae, Vol 28, Pp 381-393 (2010)
Similar to the Dst index, the SYM-H index may also serve as an indicator of magnetic storm intensity, but having distinct advantage of higher time-resolution. In this study the NARX neural network has been used for the first time to predict SYM-H
Externí odkaz:
https://doaj.org/article/3617e51d27ce4dc7b95f00ffa9243262
Autor:
H. T. Cai, I. W. McCrea, M. W. Dunlop, J. A. Davies, Y. V. Bogdanova, F. Pitout, S. E. Milan, M. Lockwood, S. Y. Ma
Publikováno v:
Annales Geophysicae, Vol 27, Pp 2721-2737 (2009)
In recent years, a large number of papers have reported the response of the cusp to solar wind variations under conditions of northward or southward Interplanetary Magnetic Field (IMF) Z-component (BZ). These studies have shown the importance of b
Externí odkaz:
https://doaj.org/article/ba91551f1f2d441ea245909760b09e49
Publikováno v:
Annales Geophysicae, Vol 25, Pp 989-999 (2007)
Based on 2760 well-defined substorm onsets in the Northern Hemisphere and 1432 in the Southern Hemisphere observed by the FUV Imager on board the IMAGE spacecraft, a detailed statistical study is performed including both auroral regions. This stud
Externí odkaz:
https://doaj.org/article/279e472b99b5445fb9e957e42336733a
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2561-2569 (2007)
In this paper, climatological features of the polar F2-region electron density (Ne) are investigated by means of statistical analysis using long-term observations from the European Incoherent Scatter UHF radar (called EISCAT in the following) and
Externí odkaz:
https://doaj.org/article/e28489121de740bca8ea10e30b48d995
Autor:
H. Wang, S. Y. Ma, H. Lühr, Z. X. Liu, Z. Y. Pu, C. P. Escoubet, H. U. Frey, H. Réme, P. Ritter
Publikováno v:
Annales Geophysicae, Vol 24, Pp 3491-3496 (2006)
With a favorable constellation of spacecraft and ground stations, a study is made on the global manifestations of a substorm onset. The onset occurred simultaneously and conjugately in both hemispheres, confirmed by observations of the auroral bre
Externí odkaz:
https://doaj.org/article/9420650c9a6c4e929a23a9f8cf33918f