Jicamarca Julia radar data

Since late August 1996, the JULIA radar at Jicamarca has been making regular coherent scatter observations of E and F region irregularities as part of the MISETA and ABC campaigns. Data for the period between August 29 and September 25 may now be accessed through the Clemson Web site at

http://landau.phys.clemson.edu/julia/julia.html

Power maps, Doppler, and zonal interferometric drifts are available for viewing. Out of a total of 25 evenings of observations, topside spread F occurred on 18 and bottomside layers on an additional 5.

The data base includes:

1) JULIA radar observations of coherent scatter power, vertical, and east-west drifts during the period between late August and middle November. Observations were made on about 55 evenings in total. F region irregularities occurred on most of these. Many evenings exhibited topside irregularities virtually from sunset until sunrise.

2) Plasma densities and temperatures recorded in Jicamarca's Faraday mode between October 8 - October 13 (universal time dates). Only weak bottomside spread F layers occurred during this period, to our good fortune.

The Jicamarca electron density/temperature data from the October MISETA period were reprocessed as of March 22, 1997. Changes in the processing included:

1. A better Faraday angle/power normalization scheme, removing most of the dark vertical bands in the pre-sunrise electron density plots.

2. An improved NLLS fitting algorithm, which has improved the accuracy of the temperatures somewhat and also provided more accurate error bars and outlier rejection.

3. An improved clutter rejection algorithm, removing the horizontal stripe artifacts from the temperature plots.

4. A switch from .jpg to .gif graphics file format, for better viewing and printing.

Temperature averages from the bottomside have also been calculated and included with the other plots.

Improving the data collection and processing algorithms is an ongoing effort, and the Faraday data may be processed yet again sometime in the future.

We are also attempting to derive electric field estimates from electrojet backscatter and will ultimately add these to the archive.

contributor: Dave Hysell
daveh@vlasov.phys.clemson.edu

Jicamarca IS radar data

Oct 1996 campaign

A quick first pass analysis of JRO IS radar data collected during the first week of MISETA 3 campaign is now complete and the results are on display on the Web at URL:

http://deln.ece.uiuc.edu:8080/santanu/miseta3.html

Outlier removal, fine tuning, etc., have not been yet applied to the data. Height integrated drifts may be contaminated by bottomside spread-F at times.

contributor: Erhan Kudeki
erhan@uiuc.edu

Oct 1997 campaign

http://landau.phys.clemson.edu/faraday/faraday.html

This is an experimental web server that generates graphs of the density, temperature, and composition observations "on the fly" and allows a degree of online analysis. More new data will appear here as they are taken, as eventually will data from past MISETA experiments. Data can now be FTP'd directly from Jicamarca, processed, and added to the website on a next-day basis.

The data quality is quite high now, thanks to a major upgrade of the acquisition hardware and software undertaken recently by the Jicamarca staff. The new data have considerably smaller error bars than before and suffer from fewer dropouts. The observations from October 19th and 20th are contaminated by spread F, naturally, but the data from the 18th are quite clean.

The data from October 18th are the best ever obtained during this part of the solar cycle, thanks to a major upgrade to the data acquisition computer and software at Jicamarca. The accuracy of the experiment is now sufficient to go hunting for ~10 degree temperature variations at night, and indeed there seems to be a detectable postmidnight temperature enhancement visible in the data from the 18th. Also visible is an enormous undulation in the F layer height around the time in question. Data from other nights are obscured by the presence of spread F - we will have to wait for future experiments to see if this behavior is repeated.

contributor: Dave Hysell
daveh@vlasov.phys.clemson.edu

Jicamarca Digisonde data

The address of the web page to access some of the Jicamarca Digisonde data is

http://ulcar.uml.edu/jicamarca/miseta.htm

The MISETA Digisonde data files are on the server:

ADDRESS         ULCAR.UML.EDU 
Username        MISETADPS
PASSWORD        Jicamarca
Directory       ARCHIVE/Jicamarca/*.SAO 

Directory       Public/SAO/
 

contributor: Bodo Reinisch
reinisch@cae.uml.edu

Arequipa FPI observations

FPI measurements of winds and neutral temperatures over Arequipa during the MISETA campaigns are available for viewing.

Mar 1997 observations

April 1997 observations

contributor: John Meriwether
john.meriwether@ces.clemson.edu