The alternative energy sector is a strong performer with specialist filtration group Porvair going well it said full year results are expected to be well ahead of expectations.The group, which provides equipment for the aviation and energy sectors, said revenue in aviation started to recover in the third quarter and aviation order intake during the quarter has been stronger.The personal goods sector is lower with SuperGroup, the company behind the ultra-hip fashion label SuperDry giving back some of the gains posted ahead of today's trading update.It was still impressive though. Sales jumped by nearly 60% in the three months to August, as the group expanded both in the UK and abroad.Top performing sectors so far todayAlternative Energy 3,598.40 +1.89%Electronic & Electrical Equipment 2,297.83 +1.67%Oil Equipment, Services & Distribution 20,413.79 +0.62%Fixed Line Telecommunications 1,991.10 +0.38%Support Services 4,024.80 +0.21%Bottom performing sectors so far todayTechnology Hardware & Equipment 567.06 -4.00%Personal Goods 16,203.97 -1.01%Industrial Engineering 5,594.93 -0.95%Tobacco 27,337.44 -0.94%Travel & Leisure 4,616.30 -0.92%