Observational studies of gamma-rays and neutrons from solar flares
Observational Studies of Multiperiodicity in Variable Stars
Observational studies of planetary waves in PMCs and mesospheric temperature measured by SNOE and SABER
Observational studies of star formation - A preliminary report
Observational studies of the clearing phase in proto-planetary disk systems
Observational study of magnetic chirality of solar active regions
Observational technique and parameter estimation in plasma line spectrum observations of the ionosphere by chirped incoherent scatter radar
Observational techniques for solar flare gamma-rays, hard X-rays, and neutrons
Observational Test for the Solar Wind Sputtering Origin of the Moon's Extended Sodium Atmosphere
Observational tests for sulfur allotropes on Io
Observational tests of coronal heating models
Observational Tests of Recent MHD Turbulence Perspectives
Observational Validation of the Chronometric Cosmology: The Redshift-Magnitude Relation for Quasi-Stellar Objects
Observations and Analysis of Longitudinal Thermal Waves on Jupiter
Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire
Observations and interpretation of spectra and rapid time variations of type-B aurora
Observations and modeling of diffuse ionized gas in edge-on galaxies
Observations and modeling of multi-frequency VHF and GHz scintillations in the equatorial region
Observations and modeling of stratospheric warmings and mesospheric coolings by the TIMED/SABER instrument and the NOGAPS forecast system
Observations and modeling of the Jovian remote neutral sodium emissions