The conjugacy of magnetic disturbance variations

Boyd, G. M.

doi:10.1029/jz068i004p01011

Cited by 13 publications

(3 citation statements)

References 2 publications

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“…Polar magnetic storms at conjugate points. It has been established by Nagata et al [1960], Wescott [1961], Boyd [1963], and others that there is an area around geomagnetic conjugate points where polar magnetic storms (bays)…”

Section: Discussionmentioning

confidence: 99%

TheS_qvariation at geomagnetically conjugate areas

Wescott¹,

DeWitt²,

Akasofu³

1963

J. Geophys. Res.

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The Sq variation at geomagnetically conjugate areas is examined by use of the San Juan‐Trelew pair. It is shown that there is no particular similarity of the Sq variation at the two stations and that the northern and southern foci of the Sq current system are not geomagnetically conjugated. Three important causes of the asymmetric Sq variations are discussed. The asymmetric part of the solenoidal component of the dynamo current could be an immediate cause. The coupling of the northern and southern ionospheres by the geomagnetic field lines tends to exaggerate the effect of the difference in the induced polarization field, rather than to reduce it; further, because of the global scale of our system the inductance of our circuit may play an important role in skewing the Sq variations. Such a dissimilarity of the Sq variation at the conjugate points is in contrast to a striking similarity of polar magnetic storms at the conjugate points in the northern and southern auroral zones. The dynamo theory of polar magnetic storms is criticized on this basis.

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Section: Discussionmentioning

confidence: 99%

TheS_qvariation at geomagnetically conjugate areas

Wescott¹,

DeWitt²,

Akasofu³

1963

J. Geophys. Res.

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“…By comparing magnetograms of different stations it was not difficult to define a conjugate area - [Wescott, 1961[Wescott, , 1962. Boyd [1963], usinO" -a correlation method was even able to distinguish between three points at a distance of 80 km. But he analyzed only one case, and the study of varia· tion of conjugacy was not made.…”

Section: Discussionmentioning

confidence: 99%

Preliminary results of a micropulsation experiment at conjugate points

Gendrin¹,

Troitskaya²

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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(Rece iv ed Fe bru ar y 3, 1965)This pape r s umm a ri zes th e preliminary res ults ob tai ne d b y diffe re nt sc ie nti s ts workin g a t th e tw o In s titutes on a co mm o n program co nce rn e d ma inl y with mi cropu lsati on s tudies be tw ee n tw o conju ga te a reas a t a geo ma gne ti c la ti tud e of 57°. Morphological studi es and di gital co mputations of corre la tio n fun c ti o ns are made on th e ba s is of the c hart reco rd s obtai ne d at the two st atio ns . Th e s ig nal be in g reco rded ind e pe nd e nt ly on mag ne ti c tape, s pec tral a na lyses a re a vailab le a lso. The principal co nclu s ions a re the fo ll ow in g:Pc 1 e ve nt s occ ur s imult a neous ly at th e two stat ions, th e amplitud e be ing s tro nger in th e north e rn he mi s phe re for the pe r iod s tud ied (J an uary a nd Fe bruar y 1964). Th e fre qu e nc ies of the osc illati ons, and more gen e ra ll y the spectral sha pe of the s ig na l as a fun c ti on of tim e , a re ve r y s imilar a t th e two st a tions. The tra in s of osc ill atio ns a re tim e-s hift ed be twee n the tw o he mi s pheres by a pproxim a te ly hal f the re pe titi on pe riod , confirmin g so me oth e r expe rim e ntal res ult s a nd ex cludin g so me t heo ri es. The co rre lati on fun c tion me thod see ms to be ab le to giv e more de ta il s a bout the spati a l a nd tim e re lations be tw ee n phe nomena in two co njugat e areas .So me results co nce rning the po lariza tion a t a s in gle s tati on and the p hase re lat ions be t wee n diffe re nt points are a lso giv e n.

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“…Magnetometers of conventional design were installed to monitor magnetic activity during the program. An analysis of some of these records has been published [Boyd, 1963]. 4. Ionosondes for the vertical sounding of the ionosphere were installed at two of the stations.…”

Section: Crpl's Initial Conjugate Point •Progra•-yimentioning

confidence: 99%

Cosmic noise absorption events at geomagnetically conjugate stations

Little¹,

Schiffmacher²,

Chivers³

et al. 1965

J. Geophys. Res.

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A two‐month program of observations of cosmic radio noise absorption in geomagnetically conjugate areas is described. A closely spaced network of stations in the conjugate area in one hemisphere revealed that the position of maximum correlation changed from event to event and during events. There were, moreover, very rare occasions in which events were exclusively confined to one hemisphere. For the conjugate events, the magnitude of the absorption was greater in the winter hemisphere than in the summer hemisphere, even under similar solar illumination conditions. The conjugate area (defined by the 0.5 correlation coefficient contour) in general appeared to be that of a circle of radius about 700 km, but for individual events the extent was clearly more limited. The movement of the conjugate area is believed to be due to the changing latitude of the point at which exospheric particles are injected into the earth's atmosphere. It is suggested that the greater absorption in the winter hemisphere is possibly the result of the asymmetry of the earth's magnetic field with respect to the earth‐sun line.

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The conjugacy of magnetic disturbance variations

Cited by 13 publications

References 2 publications

TheS_qvariation at geomagnetically conjugate areas

TheS_qvariation at geomagnetically conjugate areas

Preliminary results of a micropulsation experiment at conjugate points

Cosmic noise absorption events at geomagnetically conjugate stations

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The conjugacy of magnetic disturbance variations

Cited by 13 publications

References 2 publications

TheSqvariation at geomagnetically conjugate areas

TheSqvariation at geomagnetically conjugate areas

Preliminary results of a micropulsation experiment at conjugate points

Cosmic noise absorption events at geomagnetically conjugate stations

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Product

Resources

About

TheS_qvariation at geomagnetically conjugate areas

TheS_qvariation at geomagnetically conjugate areas