Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa21a1862h&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA21A-1862
Other
[2435] Ionosphere / Ionospheric Disturbances, [2437] Ionosphere / Ionospheric Dynamics, [2443] Ionosphere / Midlatitude Ionosphere, [2494] Ionosphere / Instruments And Techniques
Scientific paper
We present the results of a multi-scale analysis of ionospheric TEC fluctuations using a nearly six hour observation of the bright radio source Virgo A with the Very Large Array (VLA) at 74 MHz. Our analysis combines data sensitive to fine-scale structure (~1 km and ~0.001 TECU in amplitude) along the line of sight to Virgo A as well as larger structures (up to hundreds of km) observed using several (~30) moderately bright sources in the field of view. The observations span a time period from midnight to dawn local time during 1 March 2001. MSTIDs are visible intermittently throughout the night, most prominently near dawn. These appear to be mostly directed westward or southwestward with some atypical MSTID-like waves directed toward the north or northwest. Many smaller-scale (between 10 and 50 km) waves are present beginning around 01:30 and are directed toward either the southeast or southwest/west. These are reminiscent of QP-echoes observed with other experiments. The southeastward-directed waves dominate during the beginning of this time period when larger (>50 km) waves are seen moving toward the northwest. As the southwestward/westward-directed QP-echo-like waves begin to dominate around 03:00, the larger waves transition to being predominantly directed toward the west or southwest. The coincidence of these two phenomena may suggest the presence of the direction-dependent E-F coupling instability if the smaller-scale waves are generated within sporadic-E layers. In addition to MSTID- and QP-echo-like waves, we also find evidence of wave-like disturbances as small as ~2 km, most frequently between 02:00 and 04:00. While their sizes and the "Y" pattern of the VLA make their directions difficult to determine, these waves are seen most strongly along antennas in the northern arm of the VLA, suggesting they were roughly traveling in the north-south direction.
Helmboldt Joe
Intema Huib
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