Spaced‐based search coil magnetometers

Hospodarsky, G. B.

doi:10.1002/2016ja022565

Cited by 24 publications

(17 citation statements)

References 42 publications

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“…The Juno spacecraft is equipped with the radio and plasma wave (Waves) instrument having three onboard receivers that monitor electric fields from 50 Hz to 41 MHz and magnetic fields from 50 Hz to 20 kHz [ Kurth et al , ]. The receivers are connected to one electric dipole antenna that combines two 2.73 m monopole antennas whose effective axis is parallel to the spacecraft y axis and perpendicular to the spin axis and one 15 cm magnetic search coil sensor aligned parallel to the spacecraft z (spin) axis [ Hospodarsky , ]. Three onboard receivers consist of the low‐frequency receiver (LFR) and two redundant high‐frequency receivers, operating in five different frequency bands for the measurements of magnetic and electric fields of waves.…”

Section: Observationsmentioning

confidence: 99%

Direction‐finding measurements of Jovian low‐frequency radio components by Juno near Perijove 1

Imai

Kurth

Hospodarsky

et al. 2017

Geophysical Research Letters

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With the aid of the radio and plasma wave (Waves) instrument on board the Juno spacecraft, the first scientific close encounter to Jupiter (Perijove 1) of Juno led to an opportunity to perform direction‐finding measurements of the intense Jovian broadband kilometric (bKOM) radiation at 10 to 142 kHz, two escaping continuum radiation (ECR) events at 9 to 22 kHz, and two narrowband kilometric (nKOM) radiation events at 45–112 kHz. We conclude that the northern bKOM radio sources are localized on M‐shell = 50–60 field lines where M‐shell is similar to L‐shell for nondipolar fields. The beam cone half‐angle varies from 40° to 55°. By intersecting the wave k vector with the Jovian centrifugal equator, two ECR sources are located inside and outside of 11–12 RJ, and two nKOM sources are found between 11 and 20 RJ. These source frequencies and locations can be used for plasma diagnostics in Jupiter's inner magnetosphere.

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Section: Observationsmentioning

confidence: 99%

Direction‐finding measurements of Jovian low‐frequency radio components by Juno near Perijove 1

Imai

Kurth

Hospodarsky

et al. 2017

Geophysical Research Letters

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“…The radio and plasma wave (Waves) instrument [ Kurth et al , ] on board the Juno spacecraft utilizes one electric dipole antenna that comprises two 2.73 m monopole antennas and one 15 cm magnetic search coil sensor [ Hospodarsky , ]. They are connected to three onboard receivers referred to as the low‐frequency receiver and two redundant high‐frequency receivers (HFR).…”

Section: Observationsmentioning

confidence: 99%

Statistical study of latitudinal beaming of Jupiter's decametric radio emissions using Juno

Imai

Kurth

Hospodarsky

et al. 2017

Geophysical Research Letters

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Synoptic decametric (DAM) radio observations at Jupiter were made in a broad Jovicentric latitudinal range of −21° to +15° by the Juno polar orbiting spacecraft from 21 June to 10 December 2016. We investigated the occurrence probability of non‐Io‐related DAM. At 19.5 MHz, as Juno's latitude varies from +15° to −21°, a peak of non‐Io‐B occurrence probability at 175° System III central meridian longitude (CML) gradually shifts in longitude to 140° CML. Also, another peak occurs at 110° CML between −15° and −9°, merging into the bottom edge of the former peak. This J‐shaped feature is similarly seen at 16.5 MHz. Using the Jovian magnetic field models, the fixed hollow cone model can reasonably account for the J‐shaped structure for radio sources traced along active magnetic flux tubes onto Jupiter's surface projected at about 135°–149° System III longitude. Moreover, these non‐Io‐B spectral profiles extend from 13.5 to 23.5 MHz.

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“…2b). The fluxgate action has been demonstrated to have bandwidth to at least 3 kHz (Ioan et al, 1996;Miles et al, 2013;Primdahl et al, 1994). However, since fluxgate sensitivity is essentially flat with frequency and search coil gain tends to increase with frequency until the self-resonance of the coil, search coil magnetometers tend to provide better sensitivity above a few tens of Hz.…”

Section: Introductionmentioning

confidence: 99%

A hybrid fluxgate and search coil magnetometer concept using a racetrack core

Miles

Narod

Milling

et al. 2018

Geosci. Instrum. Method. Data Syst.

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Abstract. A proof-of-concept hybrid magnetometer is presented, which simultaneously operates as both a fluxgate and a search coil, allowing it to sense the magnetic field from DC to 2 kHz using a single sensor. Historically, such measurements would normally require two dedicated instruments, and each would typically require deployment on its own dedicated boom as the instruments mutually interfere. A racetrack fluxgate core combined with a long solenoidal sense winding is shown to be moderately effective as a search coil magnetometer, and the search coil effect can be captured without introducing significant hardware complexity beyond what is already present in a typical fluxgate instrument. Several methods of optimising the search coil action of the hybrid instrument are compared with the best method providing sensitivity and noise performance between comparably sized traditional air-core and solid-core search coil instruments. This hybrid sensor topology should miniaturise to platforms such as CubeSats for which multiple boom-mounted instruments are generally impractical, so a single hybrid instrument providing modest, but scientifically useful, sensitivity from DC to kHz frequencies would be beneficial.

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Spaced‐based search coil magnetometers

Cited by 24 publications

References 42 publications

Direction‐finding measurements of Jovian low‐frequency radio components by Juno near Perijove 1

Direction‐finding measurements of Jovian low‐frequency radio components by Juno near Perijove 1

Statistical study of latitudinal beaming of Jupiter's decametric radio emissions using Juno

A hybrid fluxgate and search coil magnetometer concept using a racetrack core

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