Results 81 to 90 of about 20,282 (172)
Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.Abstract Sporadic E (Es) layer plays essential role in ionosphere‐atmosphere coupling. Theoretical simulations show that the atmospheric gravity waves (GWs) in the lower thermosphere are the main modulatory source on Es dynamics at small spatial scales and short periods.
Junyi Wang +9 more
wiley +1 more source
Physical and dynamical studies of meteors. Meteor-fragmentation and stream-distribution studies [PDF]
Population parameters of 275 streams including 20 additional streams in the synoptic-year sample were found by a computer technique. Some 16 percent of the sample is in these streams.
Sekanina, Z., Southworth, R. B.
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Quarterly Journal of the Royal Meteorological Society, Volume 152, Issue 774, January 2026 Part A.We use active remote sensing from a ship during the EUREC4$$ {\mathrm{EUREC}}^4 $$A campaign to characterize the environment before, during, and after precipitation in shallow convection. (1) Shallow clouds barely precipitate (only virga). Congestus clouds generate precipitation, occurring less often in the afternoon but with higher cloud fractions. (2)
Claudia Acquistapace +5 more
wiley +1 more source
Diurnal variation of overdense meteor echo duration and ozone [PDF]
The diurnal variation of the median duration of overdense sporadic radar meteor echoes is examined. The meteors recorded in August, December, and January by the Ondrejov meteor radar during the period 1958-1990 were used for the analysis.
Simek, Milos
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Meteor radiant mapping with MU radar [PDF]
The radiant point mapping of meteor showers with the MU radar by using a modified mapping method originally proposed by Morton and Jones (1982) was carried out. The modification is that each meteor echo was weighted by using the beam pattern of the radar
Miyashita, A. +5 more
core +1 more source
Serial Correlation of Meteor Radar Rates [PDF]
Symposium - International Astronomical Union, 1980 Fluctuations in meteor rates. A fundamental concept in meteor astronomy is the rate of occurrence of meteors (hourly rate). The diurnal and seasonal behaviour of meteor radar rates has been the subject of many studies in the past. In these studies the tacit assumption is made that the observed rate variations are of an astronomical nature.
openaire +1 more source
Photographic fireball networks [PDF]
Long term radar observations of any meteor shower yield good data for a study of the features of its cross section structure in detail. The hourly rates of meteor echoes represent usually the basic data from which shower characteristics are derived ...
Ceplecha, Z.
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Determination of meteor flux distribution over the celestial sphere [PDF]
A new method of determination of meteor flux density distribution over the celestial sphere is discussed. The flux density was derived from observations by radar together with measurements of angles of arrival of radio waves reflected from meteor trails.
Andreev, V. V. +3 more
core +1 more source
MENTOR: Adding an outlying receiver to an ST radar for meteor-wind measurement [PDF]
Radar scattering from ionized meteor trails has been used for many years as a way to determine mesopause-level winds. Scattering occurs perpendicular to the trails, and since the ionizing efficiency of the incoming meteoroids depends on the cosine of the
Roper, R. G.
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Mass Loss Due to Sputtering and Thermal Processes in Meteoroid Ablation
, 2005 Conventional meteoroid theory assumes that the dominant mode of ablation is by evaporation following intense heating during atmospheric flight. In this paper we consider the question of whether sputtering may provide an alternative disintegration process
Adolfsson +45 more
core +1 more source