CASSIOPE Enhanced Polar Outflow Probe (e-POP) Mission Overview

Yau, A. W.; James, H. G.

doi:10.1007/s11214-015-0135-1

Cited by 68 publications

(62 citation statements)

References 37 publications

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“…The monopole positions of RRI along with the polar coordinates defined within the dipole plane are also shown (red arrow with polar angles). This figure is adapted and modified from Figure 2 in Yau and James ().…”

Section: Instrumentation and Datamentioning

confidence: 99%

Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

et al. 2018

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Heavy (O+) ion energization and field‐aligned motion in and near the ionosphere are still not well understood. Based on observations from the CAScade, Smallsat and IOnospheric Polar Explorer (CASSIOPE) Enhanced Polar Outflow Probe at altitudes between 325 km and 730 km over 1 year, we present a statistical study (24 events) of ion heating and its relation to field‐aligned ion bulk flow velocity, low‐frequency waves, and field‐aligned currents. The ion temperature and field‐aligned bulk flow velocity are derived from 2‐D ion velocity distribution functions measured by the suprathermal electron imager (SEI) instrument. Consistent ion heating and flow velocity characteristics are observed from both the SEI and the rapid‐scanning ion mass spectrometer instruments. We find that transverse O+ ion heating in the ionosphere can be intense (up to 4.5 eV), confined to very narrow regions (∼2 km across B), is more likely to occur in the downward current region and is associated with broadband extremely low frequency (BBELF) waves. These waves are interpreted as linearly polarized perpendicular to the magnetic field. The amount of ion heating cannot be explained by frictional heating, and the correlation of ion heating with BBELF waves suggests that significant wave‐ion heating is occurring and even dominating at altitudes as low as 350 km, a boundary that is lower than previously reported. Surprisingly, the majority of these heating events (17 out 24) are associated with core ion downflows rather than upflows. This may be explained by a downward pointing electric field in the low‐altitude return current region.

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Section: Instrumentation and Datamentioning

confidence: 99%

Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

et al. 2018

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“…Ex-Alta 1 is the University of Albertaˈs first CubeSat mission and the first spacecraft to be built in Alberta. The utility of the full cadence 100 samples per second (sps) burst mode data will be evaluated by using conjugate studies to compare against magnetic field measurements from the ESA Swarm spacecraft [Friis-Christensen et al, 2008] and the magnetic field experiment [Wallis et al, 2015] on the Canadian Space Agency Cassiope/e-POP spacecraft [Yau and James, 2015]. Ex-Alta 1 will be launched from the International Space Station via a NanoRacks deployer to an orbit with a nominal altitude of 400 km, an inclination of 51.6°, and an orbital period of 92.6 min.…”

Section: Introductionmentioning

confidence: 99%

A miniature, low‐power scientific fluxgate magnetometer: A stepping‐stone to cube‐satellite constellation missions

et al. 2016

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Difficulty in making low noise magnetic measurements is a significant challenge to the use of cube‐satellite (CubeSat) platforms for scientific constellation class missions to study the magnetosphere. Sufficient resolution is required to resolve three‐dimensional spatiotemporal structures of the magnetic field variations accompanying both waves and current systems of the nonuniform plasmas controlling dynamic magnetosphere‐ionosphere coupling. This paper describes the design, validation, and test of a flight‐ready, miniature, low‐mass, low‐power, and low‐magnetic noise boom‐mounted fluxgate magnetometer for CubeSat applications. The miniature instrument achieves a magnetic noise floor of 150–200 pT/√Hz at 1 Hz, consumes 400 mW of power, has a mass of 121 g (sensor and boom), stows on the hull, and deploys on a 60 cm boom from a three‐unit CubeSat reducing the noise from the onboard reaction wheel to less than 1.5 nT at the sensor. The instrument's capabilities will be demonstrated and validated in space in late 2016 following the launch of the University of Alberta Ex‐Alta 1 CubeSat, part of the QB50 constellation mission. We illustrate the potential scientific returns and utility of using a CubeSats carrying such fluxgate magnetometers to constitute a magnetospheric constellation using example data from the low‐Earth orbit European Space Agency Swarm mission. Swarm data reveal significant changes in the spatiotemporal characteristics of the magnetic fields in the coupled magnetosphere‐ionosphere system, even when the spacecraft are separated by only approximately 10 s along track and approximately 1.4° in longitude.

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“…The electromagnetic radiation was observed with the RRI (Radio Receiver Instrument) in the e-POP (enhanced Polar Outflow Probe) package on the fixed platform of CAS-SIOPE Yau and James, 2015). The RRI is equipped with four monopole antennas, configured into two 6 m crossed dipoles, d 1 and d 2 , that provide voltage magnitudes (V 1 , V 2 ) and phases ( 1 , 2 ) of the detected signals.…”

Section: T B Leyser Et Al: L-mode Wave Pumping Near Geomagnetic Zementioning

confidence: 99%

Evidence of <i>L</i>-mode electromagnetic wave pumping of ionospheric plasma near geomagnetic zenith

et al. 2018

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Abstract. The response of ionospheric plasma to pumping by powerful HF (high frequency) electromagnetic waves transmitted from the ground into the ionosphere is the strongest in the direction of geomagnetic zenith. We present experimental results from transmitting a left-handed circularly polarized HF beam from the EISCAT (European Incoherent SCATter association) Heating facility in magnetic zenith. The CASSIOPE (CAScade, Smallsat and IOnospheric Polar Explorer) spacecraft in the topside ionosphere above the F-region density peak detected transionospheric pump radiation, although the pump frequency was below the maximum ionospheric plasma frequency. The pump wave is deduced to arrive at CASSIOPE through L-mode propagation and associated double (O to Z, Z to O) conversion in pump-induced radio windows. L-mode propagation allows the pump wave to reach higher plasma densities and higher ionospheric altitudes than O-mode propagation so that a pump wave in the L-mode can facilitate excitation of upper hybrid phenomena localized in density depletions in a larger altitude range. L-mode propagation is therefore suggested to be important in explaining the magnetic zenith effect.

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CASSIOPE Enhanced Polar Outflow Probe (e-POP) Mission Overview

Cited by 68 publications

References 37 publications

Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

A miniature, low‐power scientific fluxgate magnetometer: A stepping‐stone to cube‐satellite constellation missions

Evidence of <i>L</i>-mode electromagnetic wave pumping of ionospheric plasma near geomagnetic zenith

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CASSIOPE Enhanced Polar Outflow Probe (e-POP) Mission Overview

Cited by 68 publications

References 37 publications

Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

A miniature, low‐power scientific fluxgate magnetometer: A stepping‐stone to cube‐satellite constellation missions

Evidence of &lt;i&gt;L&lt;/i&gt;-mode electromagnetic wave pumping of ionospheric plasma near geomagnetic zenith

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Evidence of <i>L</i>-mode electromagnetic wave pumping of ionospheric plasma near geomagnetic zenith