Plasma, magnetic field and charged particle data from the Ulysses spacecraft is used to demonstrate that MeV particles follow channels defined by solar wind flow regimes

Bame, S.J. (Los Alamos National Lab., NM (United States))

Goldstein, B.G. (Jet Propulsion Lab., Pasadena, CA (United States))

Page, D.E.

UNT Digital Library

NOTICECERTAIN DATACONTAINED IN THISDOCUMENT MAY BEDIFFICULT TO READIhl MICROFICHEPRODUCTS...- ‘.. ”/’iLA-UR- 93-:286Tit/e: ~ SOLAR WIND ~}lANNELs FOR MEV PARTICLESAWW(S): ‘II-E.Paqe, S.J. Flame,and R.c. (h]dsteinSUtmmd10 (:,~ltl,~ry (:l]smic R,IV (:mfrrmlcpo (;,ll[l,lry, Ctqrr,lda1’)-:! (-I ,Illly lW-13., ..,.. . .. . ..... . .Los Alamos/l All\)N AI lAll0llArl)ll%I ,1-, AI.WII,WIN. II,, I,LII I ,11RM,IllWv ,111 ,lt[sll!WIIV1l.111,.911 lul,lql #lIqw1lhlll,lv wlllvlklv8U 8.. .u,”I,,II,uI t,v III,, I hi,”,,,m.,lv,d t .,I, I,,,,,,., !,,, llm I I , [ Imql.l,lllllltll ,11 I ml,a,,lv.Ituh , ,ttnf,atI W 141P, I NV, II. IIv .U a .INAUI In,, ,d h.. .IIh8 h NW IMIltVIdImIIM4 ,IIIIWW, IIInII ItMI I I . . I M,WUIIIII,MII I.) IwU.. d II, WW., II,W,I t,I~,IIIV hIWI h .MIW IatIUIMI.11 III IMIIIIVIIMm 1,1=vuhhlmil hwm:11NM I IMIIIIIuII14111III III UIIIMJoIIw* h IhI 5mI hII I I :S I .mIWWIIIIhJII1IMIIIDI.W, I III, I am AI,mIm.., t4mtuum#h,tI .tlmtndmww18u II IIn!q tlml I)WI Iutitimllmtulmm~ 11,,. mm b m, wtth phntlml IIno190Ilht ,HI.IIUI m.I ,,1 Mm I I ‘. I IOIIWIIIIIII,II8,1 I fyq,m;uwiiunal INISflncl~~lm ,*,,”,I“,*,*’‘ I,.,.,Mlnm11.,it!Mm Ilk*lD.E. P89m1, S.J. Baaw2, ●nd B.G. doldst=irr’1. E6A/Ulycaom Office, JPL, P-ndona, CA 91109 USA2. Loo Ala.mom lfat.Lonal Lab., NM 8“1545, USk3. Jet Propwlalert Laboratory, Pasadena, CA 91109Plauma, magnet.lc fL@Ad and charged par~icla data from t.tmulymmm #pac*craft im used to dmnmtrate that HO partielosfollou Channels dofinad by 8olar wind flow rmqimas.1. INTRODU~IONEnargetic parti,clcm prvducul Ln oolmr flares travel throughLntorplmotarv ❑pace, followlnq routal) dotorminad by thestructure of tho intsrplanatary medium. They ●uftac ●cmtemringat klnkm Ln tho lntorplmotaq magnetic fLold and theirpragcoms in ●paco 1s frequently doscribod am diffusion, withthe eLca and numb-r of kinks encountococt dotermlning tho moanfree path. Tho ●voraqo pewer qmtcal dwmity of magnotlekinks ham Loon nwamwod ●nd lnmrtod in theorlom ot particlepitch ●nqlo dLtfu810n. Mean free pathu thus calculated ●rcabout tcn tirnee ●a 1ler than rman frea path- d.iuced fromkime-lntanaity ●nd tlrm.-aniootropy profiloo of ●lac particlmgvanta (oq pmlmer (1982), Wmnn@z ond Wibborons (1993) ).ltornultm ●ra prwaantad balow which ●uqqomt that U-v ■olarparticlom can follow tlcru roghnom in tho ●olar wind which cmprovide ●amlmr thmn mvmrqm trarrqx)rt cunrlltiona.2. THE DATAP———--——— —.-——- .-.— ---1 I1II1‘=-,t \*, ~ o O-le![I y’%i iL..l...-J . :.—_LL* A-..~ .l.,tilA-l~33 137 Im 141IT,,...10ma4 .fa ------./\ ,}..J?lg 1. Protonintanmit~mm aroundDay 139 (May 19) of1991. T1’iobottomcurve plotslntonait~os in four90, ●otto c- for1.8-3.8 Hov protonm.The ●niaotropy IamtmCrcm aoctor boundarypmmago at 0045 onDay 138 until Day142.rr7*l~’-=Tlll 1“..U..,7= “={’-)IIIIIID: 9103 S334500 PAGE :1,.— — ..—— --- .— - .-._—-——-. ——r_.,_---~--r .—T ----~--?.-7——.— l-y- ---1 T!km ,~~ 1 ~~i!; ...........-.”.-! . . ,., *q w,-,-,. ,,-,g ,oJ ~e”” , - u,,.. . ,. ,,I J.t!b -.”- .,’,n I._..—. . -—. - A .-. —.. , . ——.-.-—1 -. . .JITg‘~’~- ‘ “’-”r--’-- “ “ ‘“’”-”r---”’:,-””]-. 4.%.,, ... -,-sSa F 10$ -.*. ..!.. !------ .-.. -t /] ,it! b ,, ‘,. .%..- . . !,,a.u ,,4 .._-_ , . a.. —---- 1 . .. L -i--–- -“&”’--–m ;-- .-.,—T-—-..y. ~-. ,,r , Tn- r--- .-*. ..-m5C0r[Am -,/-. . . ... . . .. .. . .. . . . ~.,o.,r”-..”j..-.”,.%...w-.,..,,+~1 1’I3C0, ‘ 4200~-‘ ‘“- “II l,’‘- “:-::”’-”.\::-:::== ‘:--’-”~””&:~----:~~T. ‘- ‘----—-”’-: ,:----+-j‘-J’-””-’-””-%.---&..’- . a “-””-” “.- --I II1 --*--,..*, ,.1 ,..i..-++- ?-+”’ t--:ao, --’I I\.;,-J+Ji;,~~..:*;!,;.,0 !..JJL;“ ... ...................,& d/90 ● *” ~’”’iI ‘ r’,+.-1.. +.+.. .~.+. ,.. - . t 1. +-t II1II(BcJt:tml) Maqn8t lC f ia~d magn I t.ud., LXI] mr ●nd. — ..-. ---- -., ..”!.- -., - lJt. ,dJLcl i~rr ILC●hewn ) chanqau Llttlm. Tha parameter which aeome moatobviously r.lated is the uoiar wind pratcrn t-peratr.rre, ‘l’p.(Alpha minperatura shrwa almilar bahavLour). Thu8 we findnaighbouring flow r-glmam sblo to channel or trr●ccludt protonswith enarglao Up to 90 I’4av● If we think of those flow :eqmamcreasing tha opacacratt ●c aCrlat wind ●peed , then w uxwct adistanco equal to the gyroradioua Of a 10 Mev proton to betravormad in about S minuto8. F1.qurm 2 ~ndicateo that choboundmrimm htwem flow reghem ●ro no wider than ● f-w t.imeo 5mlnutms.3. UISCUGSIONMany examplam with mudden flwi chang.u ●Lnilar t.othe akmvocan be found in tha Ulyae98 data. It may b~ that not all oftha partLcle distributions obfi~rved hava boon recently producxdon the sun, sane ntay rm~ult fr~ dwckw tnd Lntoractlcmraq~one. ?iOwevor particlo b@havLOtir At tho solar wind flowbr.n,mdariee deocribed above munt be indLcat.tve of what happOnSwhmn Kev ●olar particles propaqats through tha intorplanatarymedium . With Lhls sconarlo it ●aoim unrealimtie to try torlumcriba Ilmv particle propagaLiun by dltfuoion thrmqh ●naveraqo kntorplarlstary scattering msdium. ThQ ●ffactivanesoof channal boundarlos or flow rogim boundaries in cent.aln~ngWev partlclos 1s clear, but Lhe natura crf thame plaama otreamIntarfacmm, how ttiey ~riglnate and how they arm Proosrvad in9pau0 18 rmt. clo4r. Th. ldaa of c:hannalo or conduit- in tho●Olar wind im not. new. Mccrackmrr and Naso (1966) producedCimllar idenm ●t a t.t.m whmr Lt was perhAp@ mom difficult toline up M*v ●nd molar plamna d&ta for c@nparl~nn. Earl (1976)Considered adlab~t.lt” focilsinq ●nd ●uggemted a “9uparcotmrent.mrxh af particlo t.ranaport=m Sckolmr -t al (1979) cai(oulatedhow propqjatLon sheuld chanqe from thm loading ●dgo ti3 L}IQtralllnq odgm of ● •ul~r wind straam. Houmver thm uoncoim nfpropagation 111 uaparatm mtr~mna ham fraquenr.ly bocn 0v9rlodwdIn the •t,ruqgL~ to find ~ unlvmr~sl matll~atlual deceriptiorl tofLt all camea.PAGE 4

Solar wind channels for MeV particles

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Solar wind channels for MeV particles

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