Preliminary Results of ``World Month'' Observations at Jicamarca

Details Preliminary Results of ``World Month'' Observations at Jicamarca Preliminary Results of ``World Month'' Observations at Jicamarca

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa43a1102k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA43A-1102

Other

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

The month of September 2005 has been devoted to the URSI Incoherent Scatter group as the World Month Campaign. This will be the first time that all the ISRs in the world run for such a long time. Although the whole month has been devoted for these coordinated observations, each facility will run in their ``best effort''. The main emphasis at all the facilities will be to support LTCS (Lower Thermosphere Coupling Studies), CAWSES and/or storms. At Jicamarca, the following modes have been scheduled: a) MST-ISR between September 5 and 8: This mode uses four pointing directions and measures the daytime lower atmospheric dynamics particularly at mesospheric heights, daytime ExB drifts from 150-km echoes, and F region ISR densities during the day and night. b) Differential Phase-Vertical Drift (DVD) between September 19 and 30: In this mode, we will measure vertical drifts and electron densities, between 150 and 1000 kms. In addition, during the day we will observe the equatorial electrojet (EEJ) echoes to infer zonal neutral wind profiles of the E region. c) JULIA Vertical mode the rest of the month: JULIA modes use the whole Jicamarca array combined with smaller arrays and low power transmitters to measure daytime ExB vertical drifts, E region zonal winds and density profiles from EEJ echoes, and the intensity as well as vertical and zonal drifts of equatorial spread F (ESF) echoes. At the time of the writing, we were just starting the campaign. We have already caught the effects of an extreme solar Flare (X17) on September 7 around 1740 UT. Briefly, EEJ echoes disappear, 150-km echoes appear at lower altitudes and stronger than usual, ISR echoes from the F region ``disappear'', ionograms traces disappear, Δ H increases more than 150 nT. We expect to report and discuss this and other interesting events by the time of the conference.

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