Using the Ellipse Tool (U), try to make a flare on the top part of the icon. Change its shape by lifting the lowest to with the Convert Point Tool.



The layer’s parameters:
The Opacity should be set on 70%
Fill 0% on the layers.
Blending Options>Gradient Overlay



Gradient’s parameters:





Make a copy of the last made layer and select the Free Transform option to turn over the flare’s copy, changing its parameters too.



The layer’s parameters:
The Opacity should be set on 20%.
Fill 0% on the layers.
Blending Options>Gradient Overlay



Gradient’s parameters: