Relation of variations in total magnetic field at high latitude with the parameters of the interplanetary magnetic field and with DP 2 fluctuations

Journal Article · Tue Apr 01 04:00:00 EDT 1975 · J. Geophys. Res., v. 80, no. 10, pp. 1261-1270

OSTI ID:4187932

Langel, R A

Disturbances in total magnetic field magnitude $delta$B are generally positive from 2200 to 1000 MLT and negative from 1000 to 2200 MLT. The maximum disturbances from the positive and negative regions of $delta$B (B/sub p/ and B/ sub n/, respectively) are investigated with respect to their correlation with the average north-south component B/sub z/, the average angle theta with respect to the solar magnetospheric equatorial plane, the variance sigma/sub i/, and the magnitude B/sub i/ of the interplanetary magnetic field. These quantities were averaged over a period T ranging from 20 min to 8 hours prior to the measurement of B/sub p/ or B/sub n/. In the correlation with B/sub z/ two methods were used: direct correlation with B/sub z/ and correlation with the sum B/sub $Sigma$/ = $Sigma$B/sub z//T, where B/sub z/ less than 0. For B/sub n/ versus B/sub $Sigma$/ , data were divided into an equinoctial period and a winter period. Maximum correlations of 0.63 at T = 200 min and 0.70 at T = 60 min were obtained for equinox and winter, respectively. In all cases the peak in the correlation coefficient, when it was plotted against T, was very broad. Correlations with all other parameters were smaller than the correlation for B/sub $Sigma$/. Examination of B/sub p/ as a function of average B/sub z/ shows that an approximately linear relation holds for B/sub z/ less than 0 and that for B/sub z/ greater than 0, B/sub p/ is relatively constant. Significant magnitudes of $delta$B are found to occur in both the positive and negative regions even when the interplanetary field has been northward for over an hour. Comparison of the occurrence of disturbance in $delta$B with the occurrence of DP 2 fluctuations indicates no correlation between the two phenomena. (auth)

• Research Organization: Goddard Space Flight Center, Greenbelt, MD
• NSA Number: NSA-33-001788
• OSTI ID: 4187932
• Journal Information: J. Geophys. Res., v. 80, no. 10, pp. 1261-1270, Journal Name: J. Geophys. Res., v. 80, no. 10, pp. 1261-1270; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

*GEOMAGNETIC FIELD-- VARIATIONS
640203* --Physics Research--Atmospheric Physics-- Magnetospheric Phenomena
COORDINATES
CORRELATIONS
FLUCTUATIONS
INTERPLANETARY MAGNETIC FIELDS
MAGNETOSPHERE
N56700 --Physics (Astrophysics & Cosmology)--Planetary Phenomena
N58300* --Physics (Atmospheric)--Magnetospheric Phenomena
SUN