Time delay occultation data of the HELIOS spacecraft for probing the electron density distribution in the solar corona

Details Time delay occultation data of the HELIOS spacecraft for probing the electron density distribution in the solar corona Time delay occultation data of the HELIOS spacecraft for probing the electron density distribution in the solar corona

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jpl..rept.....e&link_type=abstract

Final Report Jet Propulsion Lab., California Inst. of Tech., Pasadena.

Computer Science

Electron Density Profiles, Helios Satellites, Occultation, Solar Corona, Solar Electrons, Time Lag, Doppler Effect, Ecliptic, Radio Transmission, Remote Sensors, Solar Wind

Scientific paper

S-band time delay measurements were collected from the spacecraft Helios A and B during three solar occultations in 1975/76 within heliocentric distances of about 3 and 215 earth radius in terms of range, Doppler frequency shift, and electron content. Characteristic features of measurement and data processing are described. Typical data sets are discussed to probe the electron density distribution near the sun (west and east limb as well) including the outer and extended corona. Steady-state and dynamical aspects of the solar corona are presented and compared with earth-bound-K-coronagraph measurements. Using a weighted least squares estimation, parameters of an average coronal electron density profile are derived in a preliminary analysis to yield electron densities at r = 3, 65, 215 earth radius. Transient phenomena are discussed and a velocity of propagation v is nearly equal to 900 km/s is determined for plasma ejecta from a solar flare observed during an extraordinary set of Helios B electron content measurements.

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