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| Titel |
Ionospheric Storm Effects above Kharkov during the August 5-6, 2011 |
| VerfasserIn |
L. Chernogor, I. Domnin, L. Emelyanov, S. Kharytonova, M. Lyashenko |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250058750
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| Zusammenfassung |
| The super strong magnetic storm began at 19:03 UT on August 5, 2011. The geomagnetic
activity index Kp during the main storm phase was 8–, Dst = –113 nT. The solar wind radial
velocity during the main phase varied within 570 – 620 km s-1. The temperature of solar
wind particles increased up to 6.4-
105 K and their concentration Nsw - 1.9-
107 m-3. The
value of the interplanetary magnetic field (IMF) Bz component was –(15 – 18) nT, the value
of the magnetic induction modulus of the IMF equaled 25 – 27 nT. The aurora
activity index was AE - 1740 nT. The value of Akasofu function was ÉÂ -Â 37 GJ
s-1.
For the observations of ionospheric storm effects, the Kharkov incoherent scatter radar
was used, which is unique source of information about parameters and processes in
ionospheric plasma in mid-latitude Europe.
The effects of the magnetic storm on August 5 – 6, 2011 were observed in variations of
ionosphere parameters confidently. The storm above Kharkov was accompanied by a negative
ionosphere disturbance. The electron density in the F2-layer maximum of ionosphere
decreased approximately by a factor up to 2 in comparison with the reference day up to 1011
m-3. Next twenty-four hours on 6 August Nm was approximately more on 30 % than in the
reference day of 4th August 2011. The F2-layer maximum height in the main phase of the
ionospheric storm increased to 513Â km. In quiet conditions of 4th August F2-layer was on a
height zm - 315 km.
The electron density on heights 200, 250, 300, 350 and 400 km in the moment of the main
phase of the ionospheric storm decreased approximately by 85, 91, 82, 61 and 27%
accordingly.
The electron temperature in the main phase of the ionospheric storm increased
approximately by a factor up to 4 and 2.5 at the heights 200 – 250 km, and in the
range of heights 300 – 700Â km Te increased approximately by a factor up to 1.5
– 1.8 in comparison with the reference day. The ion temperature in considered
period also increased approximately on 700 – 1000 K in the range of heights 200 –
250 km. On heights 300 – 700 km Ti increased approximately by a factor up to
1.5.
The storm on August 5 – 6, 2011 had adduced to transform of dynamic and heat
conditions in ionosphere. |
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