.

With the projected growth in photovoltaics, the demand for glass for the solar industry will far exceed the current supply, and thousands of new float-glass plants will have to be built to meet its needs over the next 20 years. Such expansion will provide an opportunity for the solar industry to obtain products better suited to their needs, such as low-iron glass and borosilicate glass at the lowest possible price. While there are no significant technological hurdles that would prevent the flat glass industry from meeting the solar industry s projected needs, to do so will require advance planning and substantial investments.

Two B r i t i s h S k y l a r k r e s e a r c h r o c k e t s , e a c h c a r r y i n g a p r o t o n magnetometer, were flown from t h e Woomera Rocket Range, South A u s t r a l i a , i n March 1964. i , 'The f i r s t f l i g h t merely recorded an a p p r o x i m a t e l y i n v e r s e jcube J l a w v a r i a t i o n of magnetic f i e l d w i t h h e i g h t b u t on t h e second f l i g h t a magnetic d i s c o n t i n u i t y , of approximately24 gammas a m p l i t u d e , was r e c o r d e d . T h e s e r e s u l t s 4 r e c o n s i s t e n t w i t h ground o b s e r v a t i o n s at 3t h e times of t h e two f l i g h t s and they e s t a b l i s h e x p e r i m e n t a l l y t h e I I e x i s t e n c e of an electric c u r r e n t system i n t h e E-region of t h e 1 i o n o s p h e r e o v e r Sopth A u s t r e l i a .of t h e c u r r e n t are, however, n o t in c l o s e agreement w i t h t h e o r e t i c a lThe h e i g h t and v e r t i c a l t h i c k n e s s p r e d i c t i o n s .

By means of a semi‐automatic procedure, scalings taken from the H records of a latitude spread of seven magnetometers, located close to the dip equator in Peru, have been used to investigate the variability of the electrojet on a day‐to‐day basis for the period from the December solstice to the equinox during a solar minimum. Large daily changes in intensity, position, and width are found, but no correlation between these quantities can be resolved. No systematic seasonal variations are found, but the records reveal a significant lunar modulation of the electroject intensity.