Antarctic Peninsula is a very suitable area for experimental investigations of troposphere-to-ionosphere energy transfer because this place characterized by the extremely high cyclonic activity, quiet background of mid-latitude ionospheric disturbances, magnetic anomaly, and rapid variations in the total ozone content. Analysis of long-term data sets obtained at Akademik Vernadsky station (former Faraday) has allowed to discover numerous facts showing the weather impact on the dynamics of middle and upper atmosphere. Among them are the correlation between atmospheric fronts and occurrence of sporadic structures in the E and F ionospheric regions, influence of large-scale cyclones on the ozone hole location and geometry, impact of the ozone layer on the troposphere-to-ionosphere energy transfer, etc.

Interaction between Atmospheric and Space Weather Systems A.V. Zalizovski

Institute of Radio Astronomy, NAS, Ukraine. Chervonopraporna str., 4. Kharkiv

Where the troposphere impact on the ionosphere could be measured?

Atmospheric gravity waves (AGW) are the principal agent that can transfer the energy from troposphere. So, that should be the region with optimal…

1.Conditions for generation of AGW in the troposphere;

2.Conditions for energy transfer from movements of neutral atmosphere to the ionospheric currents and/or plasma characteristics;

3.Quiet background of ionospheric disturbances;

4.Conditions for propagation of AGW on the ionospheric heights.

The radiation balance of the atmosphere

Гилл А. Динамика атмосферы и океана / А. Гилл – М: Мир, 1986 г. В 2-х т. Т.1 – 397 с.

Conditions for generation of AGW in the troposphere are the best in the cloud systems

Mechanism of energy transfer from the neutrals to the plasma movement is the ion drag

z diff drift windV V V V 2sin cos cos sin cos sin sinwind nx ny nzV V I I D V I I D V I

Longitudinal distribution of efficiency of ion drag mechanism in the Northern and Southern hemispheres along the 65 degree of latitude

Antarctic Peninsula

• Unique interference conditions

• Big difference between geographic and geomagnetic latitudes

• Middle geomagnetic latitudes

• High cyclonic activity • Geomagnetic anomaly

• Weddell sea anomaly

• Quick variations of total ozone content at the spring time

Geographic coordinates:

65.25 S, 64.27 W

Geomagnetic coordinates (CGM) :

50 S, 9 E

Akademik Vernadsky station

Background variations of the environment parameters at the Vernadsky station

Surface temperature Critical frequency of the ionosphere

Weddell sea anomaly

Results of modeling of the global distribution of velocity of vertical transport of ionospheric plasma by thermospheric winds

Maps of allocation of vertical velocity of ionospheric plasma for January, 15 from 0 to 12 UT 4:00 (top to bottom) in the year of low (left) and high (right) solar activity

а) b)

Daily variations of critical frequencies and ionospheric plasma vertical velocity in January(a)for the year of low solar activity,(b) for the year of high solar activity.

By using variations of ozone content during the ozone hole, it is possible to estimate the role of ozone layer in the energy transfer between the atmospheric layers

Farman J.C. Large losses of total ozone in Antarctica reveal seasonal ClOx/NOx Interaction /J.C. Farman, B.D. Gardner, J.D. Shanklin // Nature – 1985. – vol. 315. – P. 207-210.

Ozone observations

Geomagnetic observatory AIA

Magnetic anomaly. Century variations of magnetic field

PROVISIONAL K INDICIES FOR ARGENTINE ISLANDS NOVEMBER 1998 DAY E1 E2 E3 E4 E5 E6 E7 E8 SUM

1 1 1 1 2 1 1 2 2 11 2 2 1 0 1 1 1 3 2 11 3 2 1 0 2 1 2 2 3 13 4 2 0 1 2 2 1 1 2 11 5 2 1 1 2 2 3 3 2 16 6 3 3 4 3 3 2 3 3 24 7 3 2 3 3 4 3 4 3 25 8 5 7 6 4 3 3 4 5 37 9 5 6 6 6 4 3 5 5 40 10 3 2 2 2 1 2 1 1 14 11 1 0 0 2 1 1 2 2 9 12 0 1 2 1 1 1 2 2 10 13 6 4 5 5 4 4 5 5 38 14 5 5 4 5 4 3 4 3 33

FREQUENCIES OF K MAX 0 1 2 3 4 5 6 7 8 9 Missing 6 42 100 57 15 14 5 1 0 0 0

Excitation of MHD waves by AGW of tropospheric origin

Sporadic E-layers

Daily variations of Es appearance: а) all, b) dense, c) transparence

Daily variations of dense and transparent Es

December

June

Dense Es Transparence Es

16

Difference in probabilities of Es appearance under the high and low surface pressure а) May-August; b) November-February

а) b)

High pressure High pressure

Low pressureLow pressure

Spread-F effect as a detector of impact of neutral atmosphere on the ionospheric irregularities

Seasonal variation of spread-F over Akademik Vernadsky estimated by 13-years sequence of data (1993-2005)

а

d

c

b

Daily variations of spread-F at the Akademik Vernadsky for January (а), April (b), July (c), and October (d).

Dependence of the spread-F appearance on the disturbance level of geomagnetic field in the different seasons

Dependence of the spread-F appearance on the disturbance level of geomagnetic field

Daily variations of spread-F dependence on the surface pressure and wind. Difference of conditional probabilities

North-east

South-west

South-west

North-east

High pressure

High pressure

Low pressure

Low pressure

Winter

Summer

The role of ozone layer in the troposphere-to-ionosphere

energy transfer

The role of ozone layer in the troposphere-to-ionosphere energy transfer September 11 – October 5, 1995-2004

TOC < 180 D.U. TOC > 180 D.U.

Modeling. Temperature and wind profiles in frames of NRLMSISE-00 for 65S 65W ;2

PC

g

dz

dT

T

gN xxkV

Modeling. Results for middle-scale AGW

Summary

• The energy transfer from the troposphere to higher atmospheric layers is effectively provided by propagation of internal atmospheric waves.

• Analyzing the processes in the geospace we should take into account the disturbances in low atmosphere, especially in winter time.

Thank you!

Interannual variabilityRWM - UAS 9996 kHz,

2010

May June July August September

201173.9, 13.61 72.6, 12.27 79.9, 8.74 79.7, 12.23 81.1, 8.77

95.7, 14.48 95.8, 14.07 94.3, 14.16 101.8, 11.45 134.5, 19.30

2011

73.9, 13.61 72.6, 12.27 79.9, 8.74 79.7, 12.23 81.1, 8.77

95.7, 14.48 95.8, 14.07 94.3, 14.16 101.8, 11.45 134.5, 19.30

May June July August September

CHU - UAS, 07850 kHz2010

Impact of Es of tropospheric origin on the very-long distant propagation of HF radio signals

Daily logarithmic spectrograms of signals on RWM-UAS radio line. а) month-averaged daily spectrogram calculated without 24.06.2010, b) Daily for the 24.06.2010.

Ionograms over the RWM station received on 23.06.2010, 24.06.2010, and 25.06.2010 03:30 UT

Ionograms over UAS received on 23.06.2010, 24.06.2010 , and 25.06.2010 at 03:30 UT

Surface pressure variations 23-25.06.2010 according to data obtained at UAS meteoobservatory

3. Modeling. Results for larger scales of AGW