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Gephysc/ Df Reprt t^ GEMAGNETIC DATA BANGKK, THAILAND - JANUARY- ^ji MARCH 1966 a By: DUGLAS J. BARNES JHN CHAPMAN l ^^^H «D 5 Prepared (r: II ; ADUV Cl c/-tr>nkii/-c ^.^MI>... FRT MNMUTH, NEW JERSEY 07703 CNTRACT DA-36-039 AMC-00040(E) RDER N. S384-PM-63-91 Distributin f this dcument is unlimited Spnsred by ADVANCED RESEARCH PRJECTS AGENCY ARPA RDER J71 FR THE T"M-U.S. MILITARY RESEARCH AND DEVELPMENT CENTER SUPREME CMMAND HEADUARTERS BANGKK, THAILAND STANFRD RESEARCH INSTITUTE MENL PARK, CALIFRNIA D C 0 'A CT9 1967. idl......_. fiep^^uced by the C.EARINGHUSE r fdral Scientific S Techn.cal inlrmatin Sprmgfjld Va 22151 f\

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A \ l ; R J R i-s E A R C ('.\ K k Wrc/i ;967 Gephysical Dr Reprt GEMAGNETIC DATA BANGKK, THAILAND MARCH 1966 - JANUARY Prepared fr: U.i ARMY ELECTRNICS CMMAND FRT MNMUTH, NEW JERSEY 07703 CNTRACT DA-36-039 AMC-00040(E) RDER N. 5384-PM-63-91 By: DUGLAS BARNES JHN CHAPMAN SRI Prtect 4240 Distributi n f this dcument is unlimi'ed Spnsred by ADVANCED RESEARCH PRJECTS AGENCY ARPA RDER 371 FR THE THAI-U.S. MILITARY RESEARCH AND DEVELPMENT CENTER SUPREME CMMAND HEADUARTERS BANGKK, THAILAND 1 i r Cpy N.Aji...

CNTENTS LIST F ILSTRATINS iii LIST F TABLES iii I INTRDUCTIN 1 II DISCUSSIN 2 DISTRIBUTIN LIST 13 DD Frm 1473 ii

ILSTRATINS Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Mnthly Mean Ttal Gemagnetic Field Intensity (F) at Bangkk January 1966 6 Mnthly! ean Ttal Gemagnetic Field Intensity (F) at Bangkk February 1966 7 Mnthly Mean Ttal Gemagnetic Field Intensity (F) at Bangkk March 1966 8 Magnetgrams fr the Three Mst Disturbed Days in January 1966 (21st. 22nd, and 24th) 9 Magnetgrams fr the Tnree Mst Disturbed Days in February 1966 (5th, 20th, and 23rd) 10 Magnetgrams fr the Three Mst Disturbed Days in Mar?h 1966 (14th, 23rd, and 28th) 11 Magnetgrams fr Days f Sudden Cmmencements January 1966 (7th and 20th) 12 TABLES Table I Gemagnetic Site at Bangkk, Thailand Table II Mean Hurly Ttal Gemagnetic Field Intensity (F) at Bangkk January 1366 Table III Mean Hurly Ttsl Gemagnetic Field Ii;tensit> (F) at Bangkk Febiuary 1966 Table IV Mean Hurly Ttal Gemagnetic Field Intensity (F) at Bangkk March 1966, iii

I INTRDUCTIN Gemagnetic bservatins are being carried ut at the Elc-ctrnics Labratry f the Military Research and Develpment Center (MRDC), a jint Thailand-United States rganiatin at Bangkk, Thailand. The cperatin nnd participatin f the stiff members f the Thailand Minis-try f Defense and the supprt f tiie United States Advanced Research Prjects Agency and the United States Army Electrnics Labratry have made it pssible fr the data presented in this reprt t be accumulated. The infrmatin abut the site in Tale I it pertinent. Table I GEMAGNETIC SITE AT BANGKK, THAILAND Gegraphic Gemagnetic * Latitude Lngitude Latitude Lngitude DIP' Declinatin 13.72 0 N 100.57 E 2.5 0 N 169.83 0 E 10 27'N 0 10'W The equipment at the site cnsipts f the fllwing: Instrument: Varian V-4938A Rubidium Magnetmeter Full-scale Sensitivity: ly (l 5^ = 1 gauss) Chart Speed: ne inch per hur Time Scale: Lcal time GMT + 7 hurs Range: Step-Variable, in 90Y increment^ Values btained frm the Gedesy Department, Ministry f Defense, Bangkk, Thailand.

11 DISCUSSIN The data cntained in this Bulletin are btained with a Varian V-4938A rubidium magnetmeter. The data base is available in tw frms: (1) the cntinuus magnetgram recrding and (2) a digital printut every 2 minutes, bth measuring the ttal gemagnetic ileid intensity (F). The hurly mean values f th- ttal gemagnetic field intensity are given in Tables II thrugh IV and are btained by calculatin frm the digital data. The tabulatin is fr lcal mean tim^ (GMT + 7 hurs) The mnthly mean values vs. lcal time f day are given in the bttm line f the tables and pltted in Figs. 1 thrugh 3. The Varian. chart recrder used with the V-4938A magnetmeter has an autmatic range-changing system that fhifts the range f the re- crding by 907 when either chart extremity is reached. In Fig. 4 et seq. the range f F shwn at the left f the chart is fr the be- ginning f the day. Magnetgrams with a mean lcal time scalt (GMT + 7 hirs), shwhg disturbed days are givün as fllws: (1) Figures 4 thrugh 6 the three mst disturbed days f the mnth. (2) Figure 7 ther days f interest e g., thse shwing a sudden cmmencement, r highly disturbed (k 2 5). P

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X p- IM im r^ _ m x2 S r- X r- -- X X - a- r~ in u- h- r-m. r^ X X «P- C- IT in p- ir -x) r- t- t* r~ r~ X r~ r- r- r- a r- r-^ ^ r- f- p- r- r~ r~ t- P- p- 1- ^ p- H i- M (M in - (^i rn rr t IM pm X * -f IM c- r- (T X 1 - r^ r-3 3d CT ^4 N s X > a- X t- a- t in t- r~ t- P- X r- 00 r^ t- rr -.1 *. in X If X r- t- t- r- X r- r> h- r- r- ^D t- t- r- r- r^ P- (- t- X) P- 1- t- I- r- P- c~ P- p- 2. I h- (9 4 B ill Z -I tu u (9 s 10 -* t~- t- t»i ~0 m CT- m Xl X CT- X m * in in + 1- i* p-.- -t t" a- X > - X X f- CT- r^ in s t- r- r^ r- X p* rr- ' n 1-? p- m ir X3»x t» r- t~ r- X r- t~ t~ r- r- ^0 r- r- i- r^ r- r^- t~ r- X) P- I~ p- [- p- p- t- P- l~ (M in (M v * f t in M in in in m X p- ^j m -X v m?> i t r» - X t- 1 f X a- Tf -0 t- X X a- X X r^ r rr* X X in t X P p- t- X r- r~ X X t~- r~ f- r^ D t~ t^ 1* r^ i- r~ r~ r- p- P- r- X t- 1- t- r^ i- p- 4' t r X m in -t a- v0 X r- m m t-n r- (T X) IM H 3C.T- m m - -t a~ - r- t (VJ cr in r- C CT- 4 X X X i CT m X t r^ X X r- X r~ r- X X X X r- X r-.r- r- t- X P- X p- r- p- P- X P- p- P" p- p t^ >» *m fm in tr- IM X f f X X -c a -X) ^ X m 00 in T4. r^ -t 4 r P- I (VJ & 1 4 IN w4 t- cr- CT- f 9* IT- _«in _4 X p-' it X CT cr a> X X t~ X X X X X X 0 t- r- X X X p- X p- X P- X X t- r- '- p- P- P- a- r r in, CM -r >0 r- pn r- t T- X t CT- x; IM t t m «X - t ~~i "M r l m r rr in N IM IM 30 a- M» in IM 1 m x 4 N x P4- ^ 4 00 X X X X X X a X X X X t~ X X X X X X X X X 'T (- X r c- X X '"" '" 8 w SET T 8 ^ * W V W W B w w - 7 T * '* w T P?! T "* "7: w "? w 5?! r^ rj. ( M t r^l r N m r*l IM M *.s N IM 1») "t x> N t _ t- i»* ~" C X X X X X X X X X X r- X X - X X X X X X t- X X X X p- X '- ~- _ X 0 vd X * cr ^i rj ^H r» in «^ _, -r P- im in t J r^ ff> T- -X X) r^ (\J (M (M m r w m r r^. IM IM -X -4 CM "t p- ' ^J p- * -H 00 X X X X X X X X X 31 t~ X X X X X X X X X t- X X X X p- 1^ X X? 8 5 CT- _ ^0 t ^5 X t CM t m in Tf in -CT- ^H x> m r~ _ ir X X IM -t t "J X (M (M. IM rj ^ N IN IM ^ rj a- * _«in 30 ~ m r- a- X cr c 00 X X X X X X r~ X X X h- r- X X X X t- X X X r- r~ X r- p~ r- t- X X,D cr X rvj t s CT IM _ w t, ^n 1*1 _ IM X) in 17- m X in T- im M c- -1 -X 4 cr _4 r- 4 ^H 1*1 X CT- r» IM X 17- X _* -r p- tr r^ X ^ r«x - X X r- X X X X r- X X X h- r- X C^ t- X r^ r^ r^ X r^ r^ r- i- p- r^- t- p- p- r, r- a- M 1 ct " IM «1 r (M in t " _ * -r m " t + j X 9 r- 3- c c n c rl 0 X c~ X X X p- & i\ m P- P" p- -t p- p- 30 r- r~ 1- t- X r- t- h- X t~ r- t- r- r~ X (- i- r- p- P- p- p- r- r^ r- r-r^ t- r*i s a - N m ir t i m 6 -t in «-1 ' t ^ ^-J CT- IM t- in MM in -1 8 ff a- r- X X C" r- X X 0 m m i- t- CT- 30 i~ p- X in 0 P- r- -1- x> r- p- r- r- r~ 1- r- r- t- r- r- t- t- t- t- i^ t- h- I* P- P-!- p- r^ r- r- r- r- : t- r- r in rt in -M -^ r- vv X d U X r^ 0 ^r-. X IM X in - t- t t m I- rs IM X a- t- X X i» r- X r- r- T -J X! r^ X P- P- ^ p- -r p- P- t- -t v> P- t» 8 r- l- r~ r- r^ t- i- 1- t» r- (- t- f^ r- t~ r~ P- P- p- P- c^ p- P- p- p- p- r- r- r- X (M _ (M :- im ~ X X X IM t t~ _, M IM s r X _ X 3N -r X -M n; _ ii, X 0^ r- X X c X X t- X IT -r J J r- X r~ r^ X X CT- in 0 X! p- in X> r~ t- J r- r- r- r* r- r- I- f- r~ I-- r- t- t~ t~ c^ h- t^ r^ p- p- x> P- 1^ P- p- p* P- p- r~ s 5 8 l - r^ X ~ in t- r* IM fv> g X f l>- rn IM r^ in XJ X X X a t in ^ ir IM X c^ r- r~ t~. C7- X X X 3D f m XJ X X I- c- f- X -f p- I- X ^ X r- r- r- t~ r- r- t- r- t- r- I- r- r- t- l~ P- r- t- P- p- '^ ^ i- P- t^ t- p- i- r~ '- t- CT- CT s ff 1 cj _ in r t- rj fy- -t (7- X 0 -t ir r «1 ir nj 4, X X m 'f 0 X X X r^ h» X.-? X X X ^c -r in * t- t- x r- P- X ^r t p- in X r X) X r^ r- r- t- t- r- 1- r* r- t- r- t- r- t- I- r- t~ f- p- p- p- Xi r - r- l- p- p- r^ p- r^ a i- t/^ >T^ X r r^ xi -r f m r~ in (T rm -t -n r 'j rri t -M i i-t r- t X X X r- t-, a 0 X X X X! rn ir a p- P- r* X) r- X X f 0 0 IS - ^ r- t~ r- r~ i- t- f- r- (- t- r- t- 1- h- - t- r- 1^ t- p> i~ p- p- r- p- fj r~ t- -r -r X [- ^ (f 0 rr* in -t _ J t- -t 0 ^M -M ^n ry~.. -J _ X I^J j I^J N 1 X! ; X r- (- X c- h- X r- r- "-1 T *; t~- P- X) r- (- X u" -t t- r. X -t C ^ ^c t- r- t- r- t- M^ h» r- [^ f~ r- t^ r- r- t- r- t- t- I- p- I- r~ r^ r-- r- r- * CJ * I (0 K CD J> = w a «0 N c?! 8 Sj a (M Si a 8 N CM 8 s S i«5 c 8 2 -J I I ^8 q />» 5 5 I tr. x ui tn uj t K 4 + T U. ^ J 4 (-.. > uj _ 5 t - (- _J -J 00 4 3 0

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I UNCLASSIFIED SgrurUy CUssifiratin DCUMENT CNTRL DATA -R&D S^cuTiiy cldt* stticmtin f title, bdy t abatrel Htui mt/eirmd tumtttatin mu x ' 'J vntvrvti» HiGtN A TING *C T vi T y (Crprate authr) Stanfrd Research Institute Menl Park, Califrnia 3 Ri PRT TITLE GEMAGNETIC DATA: BAiNGKK, THAILAND ^a. Rfcf'Hl UNCLASSIFIED 2h. C«UP N/A tlw yvnitl rrpttrt /-. clitssititfd) SECURITY CL*S5lfirAT!fJ 4. DESCRtPTtvE^Tfc:*i7, yp*/ reprt snd inclusive dates) Gephysical Data Reprt: Reprting perid January thrugh March 1966 5 AuTHRtS) (First nmme, middle Initi.»!, last name) Duglas J. Barnes Jhn Chapman «REPRT DATE March 1967»a. CNTRACT R GRANT N Cntract DA-36-039 AMC-00040(E) 6. PRJEC T N rder N. 5384 PM-63-91 C. ARPA rder N. 371 7a. TTAL N F PAFS 19 9«. RIGINATR'S REPRT NUMBER(5» Gephysical Data Reprt SRI Prject 4240 7b. N C f PEFS tti. THER REPRT N*5( (Any ther numbers that may he assigned this reprt) 10 DISTRIBUTIN STATEMENT Distributin f this dcument is unlimited 11 SUPPLEMENTARY NT^.S 12 SPNSRING MILITARY ACTtVlT> Advanced Research Prjects Agency Washingtn, D.C. 13 AEHSTRAC T Nne: Data Reprt DD F0RM 1 NV t> 1473 I m V /»J S/N 0101.807.680! (PAGE 1) UNCLASSIFIED Security Classificatin

UNCLASSIFIED Security CUissifn. atin KEY ^RDS Magnetmeter Ttal field intensity Rubidium vapr Magnetgrams n disturbed days Bangkk^ Thailand DD :T.AA73 BACK, (PAGE 2) UNCLASSIFIED Security C:«siificatin