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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Developing High Performance GaP/Si Heterojunction Solar Cells
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GLObal Solar Wind Structure (GLOWS).

Maciej Bzowski1, Roman Wawrzaszek1, Marek Strumik1

  • 1Space Research Centre (CBK PAN), Polish Academy of Sciences, Bartycka 18A, Warsaw, 00-716 Poland.

Space Science Reviews
|November 10, 2025
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Summary
This summary is machine-generated.

The GLObal solar Wind Structure (GLOWS) experiment measures heliospheric neutral hydrogen glow to map solar wind speed and density. This data is crucial for understanding particle populations observed by the Interstellar Mapping and Acceleration Probe (IMAP).

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Area of Science:

  • * Heliophysics and space plasma physics.
  • * Solar wind dynamics and heliospheric structure.
  • * Interstellar medium interaction with the solar wind.

Background:

  • * Understanding latitudinal solar wind profiles is key for interpreting heliospheric observations.
  • * NASA's Interstellar Mapping and Acceleration Probe (IMAP) mission requires this data for its objectives.
  • * Interstellar neutral (ISN) hydrogen within the heliosphere interacts with the solar wind.

Purpose of the Study:

  • * To provide data on the evolution of solar wind speed and density latitudinal profiles.
  • * To utilize the GLObal solar Wind Structure (GLOWS) experiment for heliospheric measurements.
  • * To enable better interpretation of heliospheric neutral and charged particle populations.

Main Methods:

  • * The GLOWS experiment uses a single-pixel Lyman-α photometer to observe heliospheric backscatter glow.
  • * It detects photons from interstellar neutral hydrogen illuminated by solar Lyman-α emission.
  • * Analysis of lightcurves reveals charge exchange reaction intensities, decomposed into solar wind speed and density profiles.

Main Results:

  • * Daily observations yield lightcurves along specific sky circles.
  • * These lightcurves are processed to derive solar wind speed and density profiles at Carrington period cadence.
  • * The derived profiles offer insights into the heliosphere's shape and solar cycle variations.

Conclusions:

  • * The GLOWS experiment successfully provides essential solar wind structure information.
  • * This data aids in understanding heliospheric particle populations and the heliosphere's evolution.
  • * It allows for the determination of energetic neutral atom flux attenuation within the inner heliosheath.