New results from in situ measurements of Cosmic Dust — Data from the GORID experiment

Svedhem, H.; Drolshagen, G.; Grün, E.; Grafodatsky, O. S.; Prokopiev, U.

doi:10.1016/s0273-1177(99)00951-5

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…Only few publications take up the α-meteoroid term in the sense of Grün and Zook (1980), such as Shestakova and Tambovtseva (1995) and Wehry and Mann (1999). Some works adopt the term 'apex particles' to refer to this class of in-situ-measured grains, having identified them in datasets of the Munich Dust Counter, as well as the GORID instrument (e.g., Igenbergs et al, 1991a;Iglseder et al, 1993Iglseder et al, , 1996Svedhem et al, 2000;McDonnell et al, 2001). In fact, Grün himself refrains from using the term α-meteoroids in later works, resorting to the term 'apex particles' instead (e.g., Grün et al, 1985aGrün et al, , 1992b.…”

Section: Transition To the New Meaningmentioning

confidence: 99%

Energy Design

Sommer¹,

Pont²,

Sommer‐Nawara³

et al. 2023

2023 Bauphysik Kalender

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The term 'α-meteoroid' was introduced to describe a group of micrometeoroids with certain dynamical properties, which-alongside the group of the β-meteoroids-had been identified by the first generation of reliable in-situ dust detectors in interplanetary space. In recent years, use of the term α-meteoroid has become more frequent again, under a subtly but crucially altered definition. This work shall bring attention to the discrepancy between the term's original and newly established meaning, and spotlight the now-overlooked group of particles that the term used to describe. We review past and present pertinent literature around the term α-meteoroid, and assess the dynamics of the originally referred-to particles with respect to possible sources, showing that their formation is the expected consequence of collisional grinding of the zodiacal cloud at short heliocentric distances. The abundance of the original α-meteoroids, which are essentially 'bound β-meteoroids', makes them relevant to all in-situ dust experiments in the inner solar system. Due to the change of the term's meaning, however, they are not considered by contemporary studies. The characterization of this particle population could elucidate the processing of the innermost zodiacal cloud, and should thus be objective of upcoming in-situ dust experiments. The attained ambiguity of the term α-meteoroid is not easily resolved, warranting great care and clarity going forward.

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Section: Transition To the New Meaningmentioning

confidence: 99%

Energy Design

Sommer¹,

Pont²,

Sommer‐Nawara³

et al. 2023

2023 Bauphysik Kalender

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“…Low-earth orbit presents a challenging environment due to the potential for plasma-induced and magnetic disturbances, high velocity debris and meteoroids, atmospheric drag, radiation, solar wind, and dust [59]- [63]. All are sources of disturbance on attitude and orbit of a CubeSat.…”

Section: A Physical Characteristics and Setupmentioning

confidence: 99%

Coupled Cyber–Physical System Modeling and Coregulation of a CubeSat

Bradley

Atkins

2015

IEEE Trans. Robot.

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We propose the application of state-space techniques to develop a novel coupled cyber-physical system (CPS) model and use feedback control to dynamically adjust CPS resource use and performance. We investigate the use of a gain scheduled discrete linear quadratic regulator controller and a forward-propagation Riccati-based controller to handle the discrete-time-varying system. We demonstrate the value of our approach by conducting a disturbance-rejection case study for a small satellite (CubeSat) application in which resources required for attitude control are adjusted in real-time to maximize availability for other computational tasks. We evaluate CPS performance through a set of metrics quantifying physical system error and control effort as well as cyber resource utilization and compare these with traditional fixedrate optimal control strategies. Results indicate that our proposed coupled CPS model and controller can provide physical system performance similar to fixed-rate optimal control strategies but with less control effort and much less computational utilization.

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“…Long-term continuous measurements of dust particles with mass and velocity information have only executed at the geostationary orbit by GORID (The Geostationary Orbit Impact Detector) experiments 9) . GORID used a flight spare of Ulysses dust detector with large aperture.…”

Section: Space Missionmentioning

confidence: 99%

Development of Plane-parallel Impact-ionization Dust Detectors with Large Aperture: A Candidate for Kibo Exposed Facility Payload

Sasaki

Ohashi

Hirai

et al. 2009

Trans. JSASS Space Tech. Japan

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In-situ measurement of dust particles in space is important to study the origin or dust particles as well as space debris. Impact-ionization dust detector can supply mass and velocity information of impacting dust particles through the shape of charge signals of impact-generated plasma. Here we have tested plane-parallel type detectors with a target plate and an entrance grid. So far we tested three models with different target diameters: 5cm, 15cm, 30cm and one rectangular model with 20cm x 20cm aperture. Through calibration experiments using dust accelerators, we confirmed that the mass and velocity of impacted dust particles can be estimated from shapes of charge signals, as are previous impact-ionization type detectors. We confirmed that the charge signals do not depend largely on the position of the impact on the target.

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New results from in situ measurements of Cosmic Dust — Data from the GORID experiment

Cited by 10 publications

References 4 publications

Energy Design

Energy Design

Coupled Cyber–Physical System Modeling and Coregulation of a CubeSat

Development of Plane-parallel Impact-ionization Dust Detectors with Large Aperture: A Candidate for Kibo Exposed Facility Payload

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