期刊
ANNALES GEOPHYSICAE
卷 27, 期 7, 页码 2831-2841出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-27-2831-2009
关键词
Interplanetary physics; Interplanetary dust; General or miscellaneous; Radio science; Remote sensing
资金
- NERC [NE/E007384/1] Funding Source: UKRI
- STFC [PP/E002218/1] Funding Source: UKRI
- Natural Environment Research Council [NER/G/S/2003/00014, NE/E007384/1] Funding Source: researchfish
- Science and Technology Facilities Council [PP/E002218/1] Funding Source: researchfish
Results are presented of a study of the temporal and spatial variability in meteor count rate observations from three VHF meteor radars. These radar are located in the Arctic (at Esrange, 68 degrees N), in the Antarctic (at Rothera, 68 degrees S) and near the Equator (on Ascension Island, 8 degrees S). It is found that for all three locations there is a strong diurnal cycle in observed hourly meteor counts and the time of maxima and minima in these counts depends on the month of the year. In addition, at high latitude there is a strong annual cycle in observed monthly-mean meteor counts, whereas for the radar at low latitude there is a semi-annual cycle. At high latitude there is also an annual cycle in the mean height at which meteors are observed. However, no such annual cycle is found in observed meteor count rates from the low latitude radar. The meteor count data from all the radars are combined to investigate the sporadic radiant distribution (i.e. the distribution of direction of arrival on the celestial sphere of sporadic meteors). This combined radiant distribution shows that there are six main source regions for meteors. The latitudinal and temporal dependence in observed meteor count rates appears to result from a combination of the sporadic radiant distribution, annual fluctuations in atmospheric density, the sensitivity of the radar to meteors from different source directions and the temporal and spatial variability in meteor fluxes.
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