Conjugate asymmetries in sudden commencement absorption and the sudden commencement absorption event of February 28, 1969

Journal Article · Sun Apr 01 04:00:00 EST 1973 · J. Geophys. Res., v. 78, no. 10, pp. 1563-1571

DOI:https://doi.org/10.1029/JA078i010p01563· OSTI ID:4389924

Phillips, J

A balloon observation of sudden commencement X rays (up to 2 times background) was made near Macquarie Island ( lambda =-61 deg ) at 0423 UT on February 28, 1969. A synoptic study of this event using riometer data, reveals that in the morning sector of the auroral zone the pattern of sudden commencement absorption (sca) is similar to ihat inferred from previous statistical studies. The siiuation in the afternoon sector is not clear. The sca at College was 10 times greater than that at Macquarie Island, and thus an asymmetry in sca between stations occupying positions of near conjugacy is indicated. A restricted period of data from the conjugate stations Great Whale River and Byrd reveals two other asymmetrical sca events. It is suggested that asymmetries in conjugate sca, and perhaps variations in the longitudinal distribution of sca, occur when a solar wind shock normal makes a large angle with the geomagnetic equatorial plane or the sun-earth line (auth)

• Research Organization: Physics Department, University of Tasmania, Hobart, Tasmania, Australia
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-001329
• OSTI ID: 4389924
• Journal Information: J. Geophys. Res., v. 78, no. 10, pp. 1563-1571, Journal Name: J. Geophys. Res., v. 78, no. 10, pp. 1563-1571; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

*SUDDEN COMMENCEMENTS-- GEOMAGNETIC CONJUGACY
*X RADIATION-- SUDDEN COMMENCEMENTS
BREMSSTRAHLUNG
ELECTRONS
IONIZATION
N58300* --Physics (Atmospheric)--Magnetospheric Phenomena
SHOCK WAVES
SOLAR WIND