Accession Number:

ADA090017

Title:

Phenomenological and Theoretical Studies on Magnetic Indicators of Substorm Activity.

Descriptive Note:

Final rept. 3 Dec 76-30 Sep 79,

Corporate Author:

BOSTON COLL CHESTNUT HILL MA DEPT OF PHYSICS

Personal Author(s):

• Carovillano,Robert L.
• Sheehan,Robert E.
• Siscoe,George L.
• Nopper,Richard W. , Jr.
• Barfield,Joseph N.

Report Date:

1980-03-21

Pagination or Media Count:

166.0

Abstract:

We report results of studies made on substorm detection, behavior, and relationship to magnetospheric processes. A scheme is developed whereby sub auroral or mid latitude magnetometer stations may be used to detect substorm occurrence. Factors limiting detection quality include longitudinal station coverage, substorm intensity, and local time dependence. Test results from mid latitude stations located in the night sector indicate 100 detection of AE events that exceed 600 gamma and 50 if AE exceeds 200 gamma, and less sensitivity for dayside detection. The AFGL magnetometer chain would give improved detection capability and reliability, in real time. A literature review is given on micropulsations as indicators of geomagnetic activity and recommendations made for utilizing the AFGL chain in this regard. Field aligned currents drive ionospheric current systems on a global scale. A model is developed to describe this process for quiet and disturbed conditions. Determination of the ground magnetic signature from an ionospheric current distribution is not unique and requires specification of image currents and ionospheric closure currents.

Descriptors:

• *GEOMAGNETISM
• *MAGNETIC STORMS
• INTENSITY
• AURORAE
• HIGH LATITUDES
• MAGNETOSPHERE
• MAGNETOMETERS

Subject Categories:

• Atmospheric Physics
• Geomagnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE