scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
STP12 Abstracts<br />
Berlin, 12 - 16 July <strong>2010</strong><br />
SCOSTEP Symposium <strong>2010</strong><br />
Study of characteristic appear<strong>an</strong>ce of TEC enh<strong>an</strong>cement at mid-latitude using TEC data<br />
of LEO satellite<br />
Goi Yukari 1 , Saito Akinori 1 , Nishioka Michi 2<br />
1 Kyoto university, 2 Nagoya university<br />
The characteristic appear<strong>an</strong>ce of Total Electron Content(TEC) enh<strong>an</strong>cement at mid-latitude<br />
was clarified by TEC data. Enh<strong>an</strong>cement of TEC in topside ionosphere was detected with<br />
TEC data. TEC data between GRACE <strong>an</strong>d GPS satellites is the integration value of the<br />
electron density in the plasmasphere <strong>an</strong>d the topside ionosphere. GRACE satellites observed<br />
the enh<strong>an</strong>cement of TEC between 50 degree <strong>an</strong>d 70 degree latitude in the geomagnetic<br />
latitude. It tends to appear during geomagnetic storm period <strong>an</strong>d to appear dawn side <strong>an</strong>d<br />
dayside.It clarified that the enh<strong>an</strong>cement of TEC in dayside caused by the storm enh<strong>an</strong>ced<br />
density (SED) <strong>an</strong>d other phenomena <strong>an</strong>d that occurred above the topside ionosphere. The<br />
characteristic appear<strong>an</strong>ce of TEC enh<strong>an</strong>cement was studied statistically. The north-south<br />
asymmetry of TEC enh<strong>an</strong>cement at mid-latitude was observed. The longitudinal dependence<br />
of TEC enh<strong>an</strong>cement in dayside was observed. In the north hemisphere, it tends to appear<br />
from 230 degrees longitude to 310 degrees longitude, <strong>an</strong>d in the south hemisphere, it tends to<br />
appear from 100 degrees longitude to 220 degrees longitude. On the other h<strong>an</strong>d, the seasonal<br />
variation of TEC enh<strong>an</strong>cement at mid-latitudes was observed in dawn side. The night of the<br />
midnight sun cause the seasonal variation of TEC enh<strong>an</strong>cement at mid-latitudes. These results<br />
indicate it was different that the characteristic appear<strong>an</strong>ce of TEC enh<strong>an</strong>cement between in<br />
dayside <strong>an</strong>d in dawn side. This difference suggests the physical process of enh<strong>an</strong>cement is not<br />
same between in dayside <strong>an</strong>d in dawn side. The ionospheric plasma in low-latitude could<br />
make the TEC enh<strong>an</strong>cement in dayside as the phenomena with equatorial ionospheric<br />
<strong>an</strong>omaly. The ionopheric plasma in high-latitude could make the TEC enh<strong>an</strong>cement in<br />
morning side by solar irradiation in polar region near midnight.
Change language