ATS 5 observational data on isolated magnetospheric substor

Sharp, R. D.

English

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FOR
LOCf•aif T-J) EXf ER1 1 TIT Olf ATS-5
(1 march tf,rou0h 31 Miv .19'(1)
Contract No. NAS 5-10392
Goddard S1.^cc 1'liE;Iit Center
Co11t1--, cti n Off i cer: KE-nt Cockerhw.ri
Technical Monitor:	 F. H. Walnscott
Prepared by:
Space Sciences Laborator.•y
LOCKH1i:ED PALO ALTO RESEARCH L,"J30RATOHY
3251 Ii_tnover Street (52 -12205)
Palo Alto, California 9)L304
Project Manaz-cr: R. D. Sharp	
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b	 For:
Goddard Space Flioht Center
Greent.elt, Maryland
N71 - 3 2 3 b ^7
(ACCESSION AMBER)
	
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(CATEGORY)Q (NASA CR OR WAX OR AU NUMBER	 	 )
4
ABOSTHAC7'
The Loo}:heed experiment on ATS -5 is continuin
in its succeo--ful operation. A detailed stud- of
individual ir;ol.ated majneto3plieric substorm:; is being
made utilizing coordinated ol , servat ions by several
groups of exper.imcnters. The stucly of the averaje
properLies of the ambierit plasma i^ conti.nm'nf-T.
q
ii
TABLE OF CONl.' TS
Title	 Pa Re
ABSTRACT . . . . . . . . . . . . . . . . . . . . .
	 ii
INTRODU^'."` , IOi; . . . . . . . . . . . . . . . . 	 .	 1
DISCUSSION . . . . . . . . . . . . . . . . . . . . 	 1
PROGRAPd YCR NEXT REPORTIl ,iG INTERVAL . . . . . . .	 2
CONCLUSIOI1S ATdD RECOT ,Ir FIITDATIOIVS . . . . . . . . .	 8
4
iii
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	 (1 ) "C) L'oc/1)1.1 "I
7 June 19'(1
SEYE-1  MI QUIIT:`i' IRLY PROGRFSS R ,;PORT
FOR
LOCK}LYKD	 011 ATS-5
0 March throuch 31 May 1971)
IN'TF O DUCT1011
Effort during this quarter has been directed in two principal areas.
Tho problem of understancd:i_n- the complex Seri-S of phenomena known as a
magnetospheric substorm has been attacked by means of an intensive study
of several isolated events for wi,ich coordinated observations from several
sources are available. Further work on documenting the average properties
of the ambient environment has i.rlcl tided the development of a computer
technique for filtering out the noise during the many periods of marCinall_y
usable data so that meanin— ful average values can be computed.
DISCUSSION
On day 44 of 1971 a particularly fortuitous set of circumstances allowed
us to obtain an unusually complete set of coordinated observations on an iso-
lated substorm which occurred in the ininediate vicinity of the ATS field line.
In addition to the narticl r^ flux data from ATS-5. all-sky camera data ::er
acquired by the Lockheed group making observations in Thempaon and Gi_llam,
Canada, and VELA plasma data were also acquired deep in the plasma sheet at
17 -^ in the tail. biaRnetometer data from EXPLURF-35 in interplanetary
space, from ATS-5 and from the specially operated stations at Thompson and
Lynn Lake, Canada, as well as from the standard observatories are also avai.l.-
able. This particular substorm had a well-developed growth phase beginning
approximately tvo hours before the auroral breakup at 0530 UT, which was
t
-1-
4marked by th- cornrnon)y observed -!.f;natur(2 in the ATkS-5 particle data.
Fi f;ure 1	 snow: some of tiv^ AT;)'-5 data dtirinU, the event of intere2t.
In addition to the above;-morrti oned event, several is of att.d	 srrbstormj
are under study for ^rl^i ^h data both	 from ATS-5 acid	 from the University of
Alberta ma,;rretornF ter net are available.	 This net consists of up to ten
stations spread out along a magnetic meridian near.	 1150 West	 l.on,;itude	 ii i
central Canada.
A relatively si n,ple and very efficient filter pr. or;ram has been developed
to remove most of the noise from the UDLE data. The proSram operates by
comparing each data sample in context with the neighboring data samples by
an ad?ustable limit on the rate of change of the analogy; output. Figure 2
shows a typical one-hour section of noisy data before filtering; the data
are shown at 2.5-second intervals. Figure 3 shows this data after pissing
through the filter with a relatively narrow filter parameter. The "bad"
samples have been replaced by the local average of the "good" samples.
For the sake of efficiency and reliability the program was kept si.rnple
arid because of this, it can not reco-nize the difference between rapidly
changing "good" data and "bad" data and therefore rejects data which is too
rapidly varying. We required that the filtered data should faithfully repro-
duce the correct one-minute average of the "good" data but allowed it to
distort the higher frequency components. It rejects steep slopes in the
data, but will. accept step-function changes inthe data if a new value of
sufficient consistency is found. An example of its effect on rapidly varyin-
;•	 data is shown in Figures 4 and 5 which show unfiltered and filtered data,
respectively.
PROGRAM FOR NEXT REPORTDIG IN'TEM1AL
Further work on the isolated substorms under study should lead to
joint papers in co.peration w i th the various groups making coordinated
observations. Further work on the average plasma properties, irrcorporatinc a
larkier quantity of the available data, will be carried out. An invited
review paper entitled "The Behavior of Low-Energy Particles Durin-; Subzto_::,s"
-2-
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ELECTRON ENVEGY FLU1
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DAY 43
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DAY 44
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 AT-S-5 data d ,.:rir. - a ma -netos henric substorm
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Figure 2. Unfiltered analoJ output from the 12-koV electron channiels at —2.5-
second intervals.
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-7-
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by I;. I ► . Sharp and tt. G. John-,-m w 11 ti w pre: ented at the jl f •tef^i,Lh Genci • it
A:,:,t^rrt ly or th- IIY,;G in its .,corr :)n Alr (-:uut ?.
COIiCI,TX JOI.':; Ali! RFCO'•U,L^JlDATIOIIS
The Lockheed experiment is continuing, to operate successfully anci the
analy:.i:, of tht: large body of dcit% is substantially furtherin j; our knovlledGe
of the phy A cs of the magneto. phere. We recourcrid the ccntinved cp-- ration
of the payload for at least another year.
-8-


Lockheed experiment on ATS-5 Quarterly progress report, 1 Mar. - 31 May 1971

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