The Mobile SOUSY Radar was operated during the MAP/WINE, the MAC/SINE, and MAC/Epsilon campaigns at Andoya in Northern Norway. A comparison between summer and winter results is presented, in particular the generation and development of the scattering regions, the different power spectral densities and the aspect sensitivities which were derived from six different beam directions

Czechowsky, P.

Reid, I. M.

Ruester, R.

Schmidt, G.

English

NASA Technical Reports Server

N89- 299 07 '
• , 365
9.4 VHF RADAR MEASUREMENTS OVER ANDOYA (NORTHERN NORWAY)
P. Czechowsky, I. M. Reid, R. Rtister, and G. Schmidt
Max-Planck-Institut fiir Aeronomie
Postfach 20, 3411 Katlenburg-Lindau, FRO
The Mobile SOUSY Radar has been operated during the MAP/WINE, the MAC/SINE,
and MAC/Epsilon campaigns at Andoya in Northern Norway. This paper presents a
comparison between summer and winter results, in particular the generation and development
of the scattering regions, the different power spectral densities and the aspect sensitivities
which were derived fi'om six different beam directions.
In summer 1983 the Mobile SOUSY VHF Radar was installed in Andenes on the
island of Andoya in Northern Norway, with the aim of investigating backscattering structures
and dynamics in the polar middle atmosphere. The object of this paper is to compare and
summarize summer and winter results obtained during several campaigns within the last five
years.
Typical summer echoes occur only during the three months from June to August. They
are characterized by persistent, intense layers, centered around an altitude of 86 km, with echo
powers of up to 60 dB above noise.
During the fall, winter and spring periods, echoes are observed predominantly at
daytime within the height range from about 50 to 85 kin. They often take the form of street-
like structures separated by about 3 to 4 kin. We have selected for this presentation some
representative examples from the different campaigns.
Table 1. Summary of Echo Region Characteristics over Andoya.
Characteristics Winter Summer
Height interval of 50 - 85 km 75 - 95 km
of echo occurrence
Typical signal to 3 - 25 dB 30 - 60 dB
noise ratio
Height of echo variable between 86 km on average
power maximum 50 and 85 km
Echo occurrence at daytime in continuous during
connection with day and night,
radio wave absorption 15% diurnal v_iation
aspect sensitivity intermittent; continuous and high
high at the top and throughout the
bottom of the layers whole layer
dominating periods
spectral width
gravity wave
periods
relatively constant
in height
tidal (12 h dominates)
and long period
gravit_ w_y_ods
". Y,I.._ _;_7_._:_,!i ,
tmmmtitm_ii_/_ ' •
maximum power
https://ntrs.nasa.gov/search.jsp?R=19890020536 2020-03-20T00:40:40+00:00Z
366
._J
ANDENES 21 JAN 1984
3/ _ RIOMETER 32.5 MHz
I I I I I I I "_
SOUSY VHF RADAR 53.5 HHz 30
_ 2o
_1, ^ A _ .... P..... lO
0 ! I I ! I I I
80- ' '_.o o _ OI
J
NT0.... _ "_!'_ _ .,_
65-
_,_ A=3dB
I
1 I ' I I I
1100 1200 1300 Ig00 1500 1600 1700
TILT
Figure I. Absorption (L) as measured on 21 January 1984 with a 32.5 MI-Iz riomcter located
atAndcncs neartheSOUSY radarfacility(top),maximum echopower (Pmax)and rncanecho
power (Pmcan)measured inthe65 to80Ionheightregionasafunctionoftime(center),and a
contourplotoftheechopower asafunctionofheightand time(bottom).
SOUSY VHF RADAR
80-
75"
E
70-
65-
- 30 _ 30 _ -60-30 0
u/ms -1 v/ms-1
1200-'1230 LT
I,'
i
21 JAN 1984 ANDENES
I -:%_ . ::
!i !!iiiiJi!!!!iii
_i_ _=_'_ _i_ _i: _
IIII ...... ?°"°-_ll;:_lli_ll_:i;.;ig_;.._
I I I I I I I J I I 12_0020 _0 60 0 5 10 1230
Sheorlms'_km "_ P/dB tILT
Figure2. Heightprofilesofthemean zonal(u)and mcridional(v)wind velocitiesfor1200-
1230 LT on 21 January1984 (left),and thecorrespondingmean echointensity(P),and mean
shear(center).A sectionofthebottompanelofFigureIisshown asa heighttimeintcnsity
plot(right).
367
E
SOUSY VHF RADAR 21 Jon198#+ Andenes
85
Shear
8O-
, IIiiliii......-._.._ .. .,......... _, .... 'i':'liil Illllllillli,lllllliillilliiiii_iiltlii!i_, ._-
, "" .. " :-_-- "iiilltlllli:: ,ili!!!tii_!_!_iii_ ....... _' '!iii!ii..,_
Diilliiilit_!!i!_--_!!_:ii _ .... i_i_.,tillllliitt!!_i_ it1!1iii_ii_!_i_,_,.: ...... _ii_itt!i :i{ .iiiii:;_..]i!l,!!,li
• ..qil, ._!i!!i,_!i ........ ;." ............. .-...iii!iiii_-:,_,_i.
70- iiiilllllllii_!_!tliiiiii!_!lll!!i_ii_!_i_!!'_'_' i_m_,uiiililliilliiiiii!!tltlil!Ul_iiiiii,_, .iltii_IilIili_ ....
llilllllliilii!_' .!qllll:_i:: ..... i!!illllilituli,-ilJiiii-_ i:!l!!l!_ t "" ":_: ... _':'"iiiii t_ii''_;''_''':'"
.,.,,,i..._!l,lll!!MUUlulllli.!!ii!Hi,,..,,.,.,,,ll!..,,,,,,,,,h..,,,,......... ...,,
65- ,iih ............
I i I I I I
85 ,..
J Power :,_,,,,,;,.. • - . ._.;l
8°1 .....:i',,,,,.......i -.,'-"!"',i!l!lillliiiiiili!iii!_ii!ii!iiili!'_':_!,...." L'.,. ....
| ... .:ii,_ : :i'_?,,..,i; " :.,,,i,,,,_l!ijl!iilililiilllili!ii_,_'t"*_'_,i_!ii!i':_ :_;i_
7s .,'_!_'_!_!:;7:;]7.:.:......,iii,iiii,i,t_,i''_'',,_:,_,ili_:/ii_:,:;,;:....::,,,,i,,,.,,.i I"_:'_
-illini,,,ii,i,,,,,,,,,,,,,,i,,,,,.!.........ii!ili,,,l,_l,,,i,,,,,,,,,.,,,,,,,,,...... . .,,,,,,,,,,,:.iiil,ll!lll!:!!!illllllll
70-_!_!!!!!!_u_u_"!"!!!!_"_uiuui_iii_u_u_ii_iiii_i_i_ii_!!_ii!!_!_!jWiij_jiiiiii
[ ."_`_''_'!"_"_HHji_ii_i:_i_jji_iiiji_i_id_i_!_!_d!!_!!!_!_i!jii_iiii_iiijiiji_u_jn!m_m!N!!!_
6sl '::,;, :........., _'i _::' : ,_:...... i ;,: , I
ins-1 km-I
150
dB
I
1130 1200 1230 1300
tl LT
Figure 3. Height-time intensity plots of shear (top) and echo power (bottom) for 1118 - 1305
LT on 21 January 1984.
368
Figure 4. Height-time plot of the variation of the echo power for a period of about 15 h which
is typical for the MAC/SINE campaign 1987. The characteristic double peak structures with
vertical separations of around 5 to 10 km are often observed to move downwards with
apparent velocities between 0.1 and 2.5 m/s and tend to oscillate in height with a period of
about 12 h.
369
MOBILE SOUSY RADAR
PERIOD :5/+h 2/+h12h I+h I h 15m 4m
i _A\- 1°8";
• 19-28 JUNE 1984 N
,.:i.I
-: f-sl3
N :"
• . . :.:_.,:.'_;_,:. 107
-r" :
eel
• , t--'_ "'s._.':_,;.,," -
L_J
_10 7 \ ::!.'.v::';.':.- .. 106 __
\' ".-:::.';_:".:,,::_?
•lo6 //v I __ los
a. 105 i l i i , , _, i
10-6 10-5 10-_- 10-3 10-2
f/Hz
Figure 5. Power spectral density of zonal velocity for the entire summer campaign 1984 (scale
on left). The lower curve shows the power spectral density of echo power (scale right).
Spectral peaks arc evident in both curves at 54, 24, 12, and 8 h. The straight line represents
summer results from Poker Flat for a height of 87.3 km [Balsley and Garcllo, 1985].
SOUSY VHF RADAR ANDENES
BS = 5"_4° -- 23 JUNE 0100LT- 25 JUNE 0162 LT_ 1987
0- "-"",_= 8 s = 6.03 ° .......... 2£. JUNE_ 06/*J0- 082 _. LT/198"/
"_...._ es=5.25° ---- 16 JULY_ 1312-1555 LT, 1987
_"._"._ PelPv = exp |-sin 2 ®/sin _ E)s)
\ ""...
\ %.,
-10 \ "...
\\ ''......
_ \ "....
o.oI_ x ....\ '...
-_o. " ___<_--,_____ "_....__
\\\_ "..
\
I" 5" 10" 35e &-0°
O/deg
Figure 6. Backscattcred power relative to that received in the vertical beam (crosses, dots and
circles) plotted as a function of zenith angle, for three different periods. The powers measured
at O = 35 ° and O ffi 38 ° (crosses) are observed in the two grating lobes of the antenna. The faU-
off in power up to 0 = 15 ° represents the equation:
P0/Pvm = exp(-sin20/sin20s) Os = half width of the backscattcr angular
polar diagram.


VHF radar measurements over Andoya (Northern Norway)

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