data were acquired by the Solar Radio Burst Locator (SRBL) at Caltech's Owens
Valley Radio Observatory (OVRO), near Bishop, California. That instrument continuously
monitors the microwave output of our sun, over the entire solar disk. On 10
June 2002, a partial eclipse began just after 5 PM Pacific Daylight Time, covering
roughly half of the sun at maximum, around 6:20 PM. The plot below shows the
relative dip in intensity observed within three frequency ranges. To prepare
this plot, averages were first computed on 9 and 10 June within the 2-4, 4-8,
and 8-16 GHz bands. Then the ratio of observations on 10 June versus those measured
on 9 June was formed, and normalized. Superimposed upon our data are fluxes
calculated from a simple model of this eclipse. The steep drop at 5:28, and
rise at 6:34, coincided with the occultation of region 9987, which must have
contributed a significant fraction of the total solar flux.
The SRBL prototype at
OVRO is owned and operated by New Jersey Institute of Technology.