scholarly journals Summer-winter hemisphere asymmetry of the preliminary reverse impulse of geomagnetic storm sudden commencements at midlatitudes

2008 ◽  
Vol 113 (A5) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. H. Sastri ◽  
K. Yumoto ◽  
J. V. S. V. Rao ◽  
A. Ikeda
Keyword(s):  
Geomagnetic Storm ◽  
Sudden Commencements ◽  
Winter Hemisphere ◽  
Hemisphere Asymmetry

scholarly journals Morphology in the total electron content under geomagnetic disturbed conditions: results from global ionosphere maps

2007 ◽  
Vol 25 (7) ◽  
pp. 1555-1568 ◽  
Author(s):  
Zhao Biqiang ◽  
Wan Weixing ◽  
Liu Libo ◽  
Mao Tian
Keyword(s):  
Geomagnetic Storm ◽  
Local Time ◽  
Statistical Study ◽  
Electron Content ◽  
Geomagnetic Disturbances ◽  
Total Electron ◽  
Summer Hemisphere ◽  
Storm Effect ◽  
Time Variations ◽  
Winter Hemisphere

Abstract. Using 8-year global ionosphere maps (GIMs) of TEC products from the Jet Propulsion Laboratory (JPL), we make a statistical study on the morphology of the global ionospheric behaviors with respect to the geomagnetic disturbances. Results show that the behaviors of TEC during geomagnetic storm present clear seasonal and local time variations under geomagnetic control in a similar way as those of NmF2 (Field and Rishbeth, 1997). A negative phase of TEC occurs with high probability in the summer hemisphere and most prominent near the geomagnetic poles, while a positive phase is obvious in the winter hemisphere and in the far pole region. A negative storm effect toward lower latitudes tends to occur from post-midnight to the morning sector and recedes to high latitude in the afternoon. A positive storm effect is separated by geomagnetic latitudes and magnetic local time. Furthermore, ionospheric responses at different local time sectors with respect to the storm commencement shows very different developing processes corresponding to the evolution of the geomagnetic storm. A daytime positive storm effect is shown to be more prominent in the American region than those in the Asian and European regions, which may suggest a longitudinal effect of the ionospheric storm.

scholarly journals Geomagnetic storm sudden commencements and their possible sources at the sun

1991 ◽  
Vol 30 (1) ◽  
pp. 23-30
Author(s):  
S. Bravo ◽  
B. Mendoza ◽  
P. Pérez Enríquez
Keyword(s):  
Geomagnetic Storm ◽  
The Sun ◽  
Sudden Commencements

Se analizan seis casos específicos de tormentas geomagnéticas con comienzo repentino (SC) durante 1978 y 1979 con el propósito de determinar los eventos solares (ráfagas, erupciones de filamentos 0 fenómenos transitorios en hoyos coronales) que las produjeron. Se utilizan las posiciones obtenidas por Hewish y Bravo (1986) mediante las observaciones de centelleo interplanetario (IPS) para las fuentes de los choques cuya llegada a la Tierra provocó los SCs. Tres de estos eventos fueron ya asociados por otros autores a alguna ráfaga o erupción de filamento y los otros tres no han sido discutidos nunca ya que no hubo ráfaga o estallido de filamento alguno en todo el Sol durante los cinco días anteriores al inicio del SC. En todos los casos se encontró un hoyo coronal en o muy cerca del centro de la región fuente estimada por IPS. Se discute la posibilidad de que ciertos cambios bruscos en los hoyos coronales puedan dar origen a la formación de choques en el medio interplanetario con las características de los observados.

Flare Induced Shocks and Corotating Streams in the Interplanetary Medium

1972 ◽  
Vol 2 (2) ◽  
pp. 79-82 ◽  
Author(s):  
M. Wiseman ◽  
P. A. Dennison
Keyword(s):  
Blast Wave ◽  
Geomagnetic Storm ◽  
Plasma Flow ◽  
Interplanetary Medium ◽  
Solar Plasma ◽  
The Earth ◽  
Sudden Commencements ◽  
Interplanetary Plasma

Geomagnetic storm sudden commencements (ssc) and sudden increases (si) can be caused by either a propagating discontinuity (i.e. a hydromagnetic shock or blast wave) in the interplanetary plasma or by the convection past the Earth of a discontinuity in the ambient solar plasma flow.

Cosmic noise absorption accompanying geomagnetic storm sudden commencements

1962 ◽  
Vol 67 (11) ◽  
pp. 4169-4186 ◽  
Author(s):  
J. Ortner ◽  
B. Hultqvist ◽  
R. R. Brown ◽  
T. R. Hartz ◽  
O. Holt ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Noise Absorption ◽  
Sudden Commencements ◽  
Cosmic Noise

What is an “Intense Geomagnetic Storm"?

Space Weather ◽  
2006 ◽  
Vol 4 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yohsuke Kamide
Keyword(s):  
Geomagnetic Storm
Sign in / Sign up

Export Citation Format

Share Document