ANALYSIS OF THE H.F. DRIFT INSTABILITY ONBOARD "METEOR" SATELLITE

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ANALYSIS OF THE H.F. DRIFT INSTABILITY ONBOARD ”METEOR” SATELLITE

V. Khodnenko, G. Shishkin, Ju. Trifonov

To cite this version:

V. Khodnenko, G. Shishkin, Ju. Trifonov. ANALYSIS OF THE H.F. DRIFT INSTABILITY ON- BOARD ”METEOR” SATELLITE. Journal de Physique Colloques, 1979, 40 (C7), pp.C7-717-C7-718.

�10.1051/jphyscol:19797347�. �jpa-00219341�

JOURNAL DE PHYSIQUE CoZZoque C7, suppZ6ment a u n07, Tome 40, J u i Z Z e t 1979, page ~ 7 - 717

ANALYSIS OF THE ICF. DRIFT INSTABILITY ONBOARD "METEORn SATELLITE

V.P. Khodnenko, G.G. Shishkin and Ju. V. Trifonov.

Moscow, U. S. S. R.

I. Introduction. Hall plasma a c c e l e r a t o ~ onboard t h e s a t e l l i t e s /I/ can generate various types of electro- magnetic' noises over a wide frequency range. A s evidenced by the previous theo- r e t i c a l and laboratory investigations /2/, /3/, /4/, noise generation i n an accele- r a t o r with r a d i a l magnetic and a x i a l elec- t r i c f i e l d s r e s u l t s from various plasma i n s t a b i l i t i e s . The paper presents t h e re- s u l t s of t h e "Meteor1' s a t e l l i t e onboard measurements of HE' electromagnetic f i e l d s generated by t h e accelerator plasma a s well a s comparison of the obtained data with experimental r e s u l t s . Onboard measu- rements make it possible t o estimate la- boratory conditions influence on d e v e l o p ment of wave processes i n plasma.

2. Emerimental Conditions. A Hall plasma accelerator of ring geometry with ceramic walls of t h e discharge channel / O D = 7 0 mm/ was i n s t a l - l e d onboard t h e Meteor s a t e l l i t e . A de- t a i l e d description of t h e s a t e l l i t e and accelerator c h a r a c t r i s t i c s is presented i n the e a r l i e r paper /I/, only basic data being suggested here. The Meteor s a t e l - l i t e i s a 3m hight c y l i n d r i c a l body of about 1 m i n diameter. The s a t e l l i t e is provided with two s o l a r panels, more than 3 m long each, r o t a t i n g along tile azimu- t h a l direction. The s a t e l l i t e has been put i n t o t h e nea-circular o r b i t of

1000 km a l t i t u d e . The accelerator-ejec- t e d 150+200 eV xenon-plasma j e t had maxi-

17 -3 mum p a r t i c l e concentration

/%,--

10 m / a% t h e discharge channel section. In- f l i g h t measured t h e plasma j e t divergence a@le proved t o be about 45'. To a t t a i n a discharge i n i t i a t i o n i n t h e accelerator, t h e plasma cathode was switched-on f i r s t . The receivers were connected t o probes

mounted on t h e s o l a r panels a t about 3 m distance from t h e accelerator. A possibi- l i t y was provided f o r t h e s o l a r panels t o move along t h e azimuth within angles

!? =

-lo0

+ +40° /Fig. I /. The measurement data were telemetered from the s a t e l l i t e t o t h e ground receiving posts.

3 . Experimental Results. Accelerator

switching on i s followed by an appreciable sgnal-level r i s e displayed on the s e l e c t i v e micro- voltmeters. It i s worth mentioning t h a t a s l i g h t s i g n a l r i s e occurs when only a plasma cathode is operative /Fig.2/. In- t e n s i t y of a s i g n a l increases a s t h e probe is approaching t h e j e t boundary

though just on t h e plasma j e t a x i s the electromagnetic f i e l d is weaker than t h a t a t t h e j e t boundary. Under s o l a r panels reversal, s p a t i a l v a r i a t i o n i n the f i e l d i n t e n s i t y somewhat d i f f e r s from t h a t un- d e r d i r e c t motion /Fig.2/. Electromagnetic f i e l d i n t e n s i t y as a function of time is p l o t t e d i n Fig.3. For t h e sake of compa- r i s o n i d e n t i c a l measurements have been taken under laboratory conditions. Inten- s i t y of f i e l d s , generated by an accelera- t o r of the same type i n t h e laboratory, proved t o be considerably lower than t h a t of satellite-derived f i e l d s . Laboratory- derived time dependence of the oscillatinu i n t e n s i t y is presented i n Fig. 3.

4. Discussion of Results. Comparison of t h e laboratory r e s u l t s with t h e s a t e l l i t e - d e r i v e d data enables one t o conclude t h a t electromag- n e t i c f i e l d s generation i n the v i c i n i t y of a s a t e l l i t e i n t h e range of

-

^{30 MHz}

i s l i k e l y t o occur due t o HF drift-ins- t a b i l i t y analysed i n papers /2/, /3/, /4/. This i n s t a b i l i t y stems from a non- uniform d i s t r i b u t i o n of electrons azimu-

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19797347

t h a l d r i f t v e l o c i t y along t h e channel axis. Non-unif o m density plasma, rota- t i n g i n the azimuthal d i r e c t i o n , genera- t e s closed KF currents causing electromag- n e t i c f i e l d s i n space /3/.

Time dependence of r a d i a t i o n i n t e n s i t y /4/, a s evidenced by t h e r e l a t e d laborato- r y experiments, i s associated, i n general with &he e n t i r e accelerator, e s p e c i a l l y its d i e l e c t r i c discharge channel, warm-up.

Ceramics-temperature variation, e f f e c t i n g i t s conductivity, brings about a change i n plasma p o t e n t i a l s d i s t r i b u t i o n which, i n turn, e f f e c t s the l o c a l i o n flow t o the walls, thereby causing a chnge i n the lo- c a l temperature

.

Variations i n p o t e n t i a l s d i s t r i b u t i o n lead t o a d i s t o r t i o n of t h e associated d r i f t - v e l o c i t y d i s t r i b u t i o n along t h e channel accompanied by varia- t i o n s i n properties of t h e i n s t a b i l i t y under considerat ion.

References :

/I/ Morozov A.I., Snarskii R.K.,

Khodnenko V.P., Trifonov Ju.V. e t a l . Kosmicheskie issledovania, v.XII, R 3, (1974)

/2/ Shishkin G.G., Gerasirnov V.P.

' X I 1 Internat. Conf. on Phenom. Ion.

Gas (1975), 310, Netherlands

/3/ Shishkin G.G. Internat. Conf. Gas dis- charge. IEE Cod. Publ. N 143, 349 ( 1976) England

/4/ Gerasimov V.P., Shishkin G.G. e t a l . X I 1 1 Internat. Conf. on Phenom. Ion.

G a s (1977) p a r t I1 771.

Fig. I. Experimental arrangement shift

----a I I I00

7

I I I I I I I I I

80

120 160 ZOO 240 280 320 360 40$.Ls1

Fig.2. Space Azimuth d i s t r i b u t i o n of t h e electromagnetic f i e l d i n t e n s i t y

I 2 3 4 5

Fig. 3. Time fluctuations of t h e o s c i l l a t i o n s amplitude