Showing papers on "Winds aloft published in 1973"
TL;DR: In this article, motion from multiple releases between 200 and 300 km from 15 rockets launched from four high-latitude locations is analyzed in the evening and midnight hours at magnetic latitudes above 65 deg.
Abstract: Electrically neutral, luminous clouds are a by-product of chemical releases conducted to create barium ion clouds for the measurement of electric fields. Wind measurements provided by the motions of these clouds are particularly valuable in that the motions can be directly compared with convective ion drift motions to test the importance of ion drag forces. Motion from multiple releases between 200 and 300 km from 15 rockets launched from four high-latitude locations is analyzed in this paper. The observations in the evening and midnight hours at magnetic latitudes above 65 deg strongly suggest that in these regions ion drag is the dominant force in driving neutral winds between 200 and 300 km. In the morning sector, it is evident that neutral wind observations cannot be directly interpreted in terms of ion drag; other factors must be considered.
123 citations
TL;DR: In this paper, the magnitude of atmospheric perturbations interpreted as gravity waves and planetary waves were analyzed by a daily-difference method, and the results on the magnitude on the gravity-wave energy deposition or reflection occurs at all altitudes except the 55-75 km region of the mesosphere.
Abstract: Previously collected data on atmospheric pressure, density, temperature and winds between 25 and 200 km from sources including Meteorological Rocket Network data, ROBIN falling sphere data, grenade release and pitot tube data, meteor winds, chemical release winds, satellite data, and others were analyzed by a daily-difference method, and results on the magnitude of atmospheric perturbations interpreted as gravity waves and planetary waves are presented. Traveling planetary-wave contributions in the 25-85 km range were found to have significant height and latitudinal variation. It was found that observed gravity-wave density perturbations and wind are related to one another in the manner predicted by gravity-wave theory. It was determined that, on the average, gravity-wave energy deposition or reflection occurs at all altitudes except the 55-75 km region of the mesosphere.
17 citations
TL;DR: In this paper, a situation that led to rapid development of strong winds over the Northern Persian Gulf is compared with a similar situation in which gales were anticipated but did not occur.
Abstract: A situation that led to rapid development of strong winds over the Northern Persian Gulf is compared with a similar situation in which gales were anticipated but did not occur. In both cases, cold air accumulated over Syria and Northern Iraq. In the first case, deep moist convection over the mountains of Northwestern Iran was coupled with a rapid southwest surge of a tongue of cold air into the Persian Gulf. In the second case, deep convec- tion did not occur, and the cold air did not move southward. Release of latent heat by deep convection and merging of the rising currents with strong winds aloft seemed to have reinforced upslope winds near the surface in the first case, which lifted the warm air in front of the advancing cold air. This explanation is made plausible by a simple energy budget.
3 citations