Ionospheric response to 2009 sudden stratospheric warming in the Northern Hemisphere

We study the behavior of the F region ionosphere in the Northern Hemisphere during the sudden stratospheric warming period of 19–30 January 2009 by using FORMOSAT-3/Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) ionosphere data (NmF2, hmF2, and height profile). We concentrated our study in the longitude bands 30°E–30°W, as well as 150°E–150°W, where no detailed study has been reported so far. At low magnetic latitude, the NmF2 decreases except during 09–12 LT: in the latitude zone of 20–40° NmF2 shows an increase of 30% during 09–12 LT. At higher magnetic latitude the NmF2 shows an increase during daytime and a reduction in the evening (21–03 LT). There is a latitude zone where NmF2 does not change. The latitude seems to correspond to the latitude where atmospheric temperature does not change. The behavior of the NmF2 seems to suggest a reduction of neutral density in low latitude and increase of neutral density in higher latitude. During the period of day of year (DOY) 25–31, the NmF2 shows a drastic reduction only during 06–09 LT in low latitudes, which is slightly away from geomagnetic equator. This special feature which occurred during declining phase of the sudden stratospheric warming (SSW) might be explained as due to enhanced dynamo electric field. The study suggests global change of the thermosphere including dynamo region, in spite of the fact that SSW is a high-latitude phenomenon which occurred much below the height region of thermosphere.

[1]  Anthea J. Coster,et al.  Impact of sudden stratospheric warmings on equatorial ionization anomaly , 2010 .

[2]  Timothy Fuller-Rowell,et al.  Forecasting the dynamic and electrodynamic response to the January 2009 sudden stratospheric warming , 2011 .

[3]  Feng Ding,et al.  Coupling between mesosphere and ionosphere over Beijing through semidiurnal tides during the 2009 sudden stratospheric warming , 2013 .

[4]  S. Fritz,et al.  Planetary Variations of Stratospheric Temperatures , 1972 .

[5]  J. Holton.  The Dynamics of Sudden Stratospheric Warmings , 1980 .

[6]  Junichi Kurihara,et al.  Links between a stratospheric sudden warming and thermal structures and dynamics in the high‐latitude mesosphere, lower thermosphere, and ionosphere , 2010 .

[7]  Arthur D. Richmond,et al.  Attribution of ionospheric vertical plasma drift perturbations to large‐scale waves and the dependence on solar activity , 2013 .

[8]  H. Fujiwara,et al.  Response of migrating tides to the stratospheric sudden warming in 2009 and their effects on the ionosphere studied by a whole atmosphere-ionosphere model GAIA with COSMIC and TIMED/SABER observations , 2012 .

[9]  E. Kazimirovsky,et al.  The Tropospheric and Stratospheric Effects in the Ionosphere , 1991 .

[10]  Shunrong Zhang,et al.  Ionospheric signatures of sudden stratospheric warming: Ion temperature at middle latitude , 2008 .

[11]  T. Matsuno,et al.  A Dynamical Model of the Stratospheric Sudden Warming , 1971 .

[12]  M. Yamamoto,et al.  Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming , 2011 .

[13]  Xinan Yue,et al.  Global ionospheric response observed by COSMIC satellites during the January 2009 stratospheric sudden warming event , 2010 .

[14]  T. Fuller‐Rowell,et al.  Did the January 2009 sudden stratospheric warming cool or warm the thermosphere? , 2011 .

[15]  D. Altadill,et al.  First observation of quasi-2-day oscillations in ionospheric plasma frequency at fixed heights , 1998 .

[16]  R. P. Lowe,et al.  Review of mesospheric temperature trends , 2003 .

[17]  S. Sridharan,et al.  Variabilities of mesospheric tides and equatorial electrojet strength during major stratospheric warming events , 2009 .

[18]  Raymond G. Roble,et al.  A study of a self-generated stratospheric sudden warming and its mesospheric-lower thermospheric impacts using the coupled TIME-GCM/CCM3 , 2002 .

[19]  T. Fuller‐Rowell,et al.  A whole atmosphere model simulation of the impact of a sudden stratospheric warming on thermosphere dynamics and electrodynamics , 2010 .

[20]  Huixin Liu,et al.  Upper atmosphere response to stratosphere sudden warming: Local time and height dependence simulated by GAIA model , 2013 .

[21]  K. Labitzke.  Stratospheric-mesospheric midwinter disturbances - A summary of observed characteristics , 1981 .

[22]  E. Araujo‐Pradere,et al.  Sudden stratospheric warming event signatures in daytime ExB drift velocities in the Peruvian and Philippine longitude sectors for January 2003 and 2004 , 2010 .

[23]  Wei Hsin Chen,et al.  Observations of global ionospheric responses to the 2009 stratospheric sudden warming event by FORMOSAT‐3/COSMIC , 2012 .

[24]  T. Pant,et al.  Equatorial counter electrojets and polar stratospheric sudden warmings - a classical example of high latitude-low latitude coupling? , 2009 .

[25]  P. Mukhtarov,et al.  Stratospheric warmings: The atmosphere–ionosphere coupling paradigm , 2011 .

[26]  M. Yamamoto,et al.  Strong thermospheric cooling during the 2009 major stratosphere warming , 2011 .

[27]  K. Labitzke.  Temperature Changes in the Mesosphere and Stratosphere Connected with Circulation Changes in Winter , 1972 .

[28]  Jorge L. Chau,et al.  Quiet variability of equatorial E × B drifts during a sudden stratospheric warming event , 2009 .

[29]  A. Coster,et al.  Unexpected connections between the stratosphere and ionosphere , 2010 .