The ADAHELI solar mission: Investigating the structure of Sun’s lower atmosphere

Berrilli, F.; Bigazzi, A.; Roselli, L.; Sabatini, P.; Velli, Marco; Alimenti, F.; Cavallini, F.; Greco, V.; Moretti, P. F.; Orsini, S.; Romoli, M.; White, S. M.

doi:10.1016/j.asr.2010.01.026

Cited by 28 publications

(22 citation statements)

References 26 publications

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“…The consequence of (21) is that the resolution of a TPR can be rigorously computed exploiting (14) with α = 1 and with…”

Section: Qs Fmentioning

confidence: 99%

“…At the same time the detector output is multiplied by ±1 in synchronism with the receiver input switching (lock-in amplifier). If the switching frequency f m is sufficiently high (f m 1/2τ ) and T 1 ∼ T QS A (same order of magnitude) the gain fluctuations ∆G/G can be neglected in (14) and the resolution obtained as [4]:…”

Section: Qs Fmentioning

confidence: 99%

“…As a consequence, the flare contribution can be separated from the total spectral flux density by extracting the only flux variations above the quiet Sun background. The latter can be estimated with a rather simple formula [14]:…”

Section: Solar Flares Spectral Flux Densitymentioning

confidence: 99%

“…This will result in improved antenna efficiency and cross-polarization performances. The main antenna will be placed within the satellite envelope, in such a way as to reduce for temperature variations [14]. The circular corrugated horn will be connected to the receiver input by means of a waveguide adapter.…”

Section: Instrument Architecturementioning

confidence: 99%

“…First it will be shown that solar flares could be detected and measured in the mm-wave frequency range from a space-based platform [14]. This methodology has never been attempted before, and allows us to reach a sensitivity much higher than that of conventional ground-based experiments.…”

Section: Introductionmentioning

confidence: 99%

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SYSTEM-ON-CHIP 36.8 GHZ RADIOMETER FOR SPACE-BASED OBSERVATION OF SOLAR FLARES: FEASIBILITY STUDY IN 0.25 μm SIGE BICMOS TECHNOLOGY

Aluigi¹,

Roselli²,

White³

et al. 2012

PIER

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Abstract-This paper deals with a feasibility study for a System-onChip (SoC) mm-wave radiometer devoted to space-based observation of solar flares and operating in the Ka-band. The radiometer has been designed in 250 nm SiGe BiCMOS process. The circuit integrates a three stages differential LNA with 37.2 dB gain and 4.8 dB noise figure at 36.8 GHz and a differential square-law detector based on HBTs, featuring a 96 mV/µW responsivity. The full radiometer achieves, potentially, a NETD of 0.1 K for 1 s integration time in Dicke mode. This work represents the first study of such an integrated instrument for Ka-band space-based observation of solar flares.

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“…The consequence of (21) is that the resolution of a TPR can be rigorously computed exploiting (14) with α = 1 and with…”

Section: Qs Fmentioning

confidence: 99%

Section: Qs Fmentioning

confidence: 99%

Section: Solar Flares Spectral Flux Densitymentioning

confidence: 99%

Section: Instrument Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

SYSTEM-ON-CHIP 36.8 GHZ RADIOMETER FOR SPACE-BASED OBSERVATION OF SOLAR FLARES: FEASIBILITY STUDY IN 0.25 μm SIGE BICMOS TECHNOLOGY

Aluigi¹,

Roselli²,

White³

et al. 2012

PIER

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Future instrumentation for solar physics: a double channel MOF imager on board ASI Space Mission ADAHELI

Moretti¹,

Berrilli

Bigazzi

et al. 2010

Astrophys Space Sci

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A Magneto-Optical Filter-based system has been proposed as an optional payload for ASI's low-budget Solar Mission ADAHELI, which has completed its Phase A feasibility study. The instrument is capable of providing simultaneous Dopplergrams, intensity and magnetic solar full-disk maps using the potassium 770 nm and sodium 589 nm solar Fraunhofer lines. The instrument is a version, re-designed for a space environment, of the one which has run an observing campaign at the South Pole in 2008 with unprecedented performance. The MOF-based system we present here is a low-cost, low-weight instrument, thus particularly fit to space applications, capable of providing stability and sensitivity of signals on long-term observations. The instrument will explore regions of the oscillation spectrum not available to other missions' instruments.

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Velocity and Temperature Response Functions of 77 Near-Infrared (800 – 1400 nm) Photospheric Lines – I

Penza

Berrilli

2012

Sol Phys

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We present a new list of solar photospheric lines in the near-infrared (NIR) region obtained by synthesis under local thermodynamic equilibrium (LTE) approximation. We give novel velocity and temperature response functions (RFs) for 77 lines over the spectral range 800 -1400 nm. Using these RFs, we are able to obtain for each line the core formation height and the range of atmospheric layers where thermodynamic perturbations are dominant. Moreover, by using the depth-integrated RFs, we give an indication of the dependence on the wavelength of the RFs and quantify their sensitivity to thermodynamic variations. The NIR region represents a significant source of interest for spectroscopic and polarimetric studies. Indeed, at these wavelengths we explore the deeper photospheric layers, and the Zeeman splitting is larger than in the visible range.Several research fields in solar astrophysics (e.g., photospheric and chromospheric dynamics, magnetoconvection in active regions, and interaction between solar plasma and magnetic field) should benefit from using this new line list. Moreover, various new NIR instruments are planned for future space missions or next generation ground-based solar telescopes, such as the European Solar Telescope (EST) or the Advanced Technology Solar Telescope (ATST).

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The ADAHELI solar mission: Investigating the structure of Sun’s lower atmosphere

Cited by 28 publications

References 26 publications

SYSTEM-ON-CHIP 36.8 GHZ RADIOMETER FOR SPACE-BASED OBSERVATION OF SOLAR FLARES: FEASIBILITY STUDY IN 0.25 μm SIGE BICMOS TECHNOLOGY

SYSTEM-ON-CHIP 36.8 GHZ RADIOMETER FOR SPACE-BASED OBSERVATION OF SOLAR FLARES: FEASIBILITY STUDY IN 0.25 μm SIGE BICMOS TECHNOLOGY

Future instrumentation for solar physics: a double channel MOF imager on board ASI Space Mission ADAHELI

Velocity and Temperature Response Functions of 77 Near-Infrared (800 – 1400 nm) Photospheric Lines – I

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